Heap-based buffer overflow in drivers/net/macsec.c in the MACsec module in the Linux kernel through 4.10.12 allows attackers to cause a denial of service or possibly have unspecified other impact by leveraging the use of a MAX_SKB_FRAGS+1 size in conjunction with the NETIF_F_FRAGLIST feature, leading to an error in the skb_to_sgvec function.

According to the versions of the kernel packages installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerabilities :

  - The kernel package contains the Linux kernel (vmlinuz),     the core of any Linux operating system. The kernel     handles the basic functions of the operating system:
    memory allocation, process allocation, device input and     output, etc.Security Fix(es):Use-after-free     vulnerability in driverset/tun.c in the Linux kernel     through 3.11.1 allows local users to gain privileges by     leveraging the CAP_NET_ADMIN capability and providing     an invalid tuntap interface name in a TUNSETIFF ioctl     call.(CVE-2013-4343)It was found that when the gcc     stack protector was enabled, reading the /proc/keys     file could cause a panic in the Linux kernel due to     stack corruption. This happened because an incorrect     buffer size was used to hold a 64-bit timeout value     rendered as weeks.(CVE-2016-7042)A flaw was found in     the Linux kernel that fs/ocfs2/aops.c omits use of a     semaphore and consequently has a race condition for     access to the extent tree during read operations in     DIRECT mode. This allows local users to cause a denial     of service by modifying a certain e_cpos     field.(CVE-2017-18224)The sctp_v6_create_accept_sk     function in net/sctp/ipv6.c in the Linux kernel     mishandles inheritance, which allows local users to     cause a denial of service or possibly have unspecified     other impact via crafted system calls, a related issue     to CVE-2017-8890. An unprivileged local user could use     this flaw to induce kernel memory corruption on the     system, leading to a crash. Due to the nature of the     flaw, privilege escalation cannot be fully ruled out,     although we believe it is unlikely.(CVE-2017-9075)In     the function sbusfb_ioctl_helper() in     drivers/video/fbdev/sbuslib.c in the Linux kernel, up     to and including 4.15, an integer signedness error     allows arbitrary information leakage for the     FBIOPUTCMAP_SPARC and FBIOGETCMAP_SPARC     commands.(CVE-2018-6412)A race condition flaw was found     in the way the Linux kernel's mmap(2), madvise(2), and     fallocate(2) system calls interacted with each other     while operating on virtual memory file system files. A     local user could use this flaw to cause a denial of     service.(CVE-2014-4171)** RESERVED ** This candidate     has been reserved by an organization or individual that     will use it when announcing a new security problem.
    When the candidate has been publicized, the details for     this candidate will be provided.(CVE-2018-1095)A NULL     pointer dereference flaw was found in the way the Linux     kernel's Stream Control Transmission Protocol (SCTP)     implementation handled simultaneous connections between     the same hosts. A remote attacker could use this flaw     to crash the system.(CVE-2014-5077)A vulnerability was     found in the fs/inode.c:inode_init_owner() function     logic of the LInux kernel that allows local users to     create files with an unintended group ownership and     with group execution and SGID permission bits set, in a     scenario where a directory is SGID and belongs to a     certain group and is writable by a user who is not a     member of this group. This can lead to excessive     permissions granted in case when they should     not.(CVE-2018-13405)In the Linux kernel before 4.20.8,     kvm_ioctl_create_device in virt/kvm/kvm_main.c     mishandles reference counting because of a race     condition, leading to a use-after-free.(CVE-2019-6974)A     flaw was found in the way Linux kernel allocates heap     memory to build the scattergather list from a fragment     list(skb_shinfo(skb)-i1/4zfrag_list) in the socket     buffer(skb_buff). The heap overflow occurred if     'MAX_SKB_FRAGS + 1' parameter and 'NETIF_F_FRAGLIST'     feature are both used together. A remote user or     process could use this flaw to potentially escalate     their privilege on a system.(CVE-2017-7477)Multiple     integer overflows in Alchemy LCD frame-buffer drivers     in the Linux kernel before 3.12 allow local users to     create a read-write memory mapping for the entirety of     kernel memory, and consequently gain privileges, via     crafted mmap operations, related to the (1)     au1100fb_fb_mmap function in drivers/video/au1100fb.c     and the (2) au1200fb_fb_mmap function in     drivers/video/au1200fb.c.(CVE-2013-4511)It was found     that in the Linux kernel through v4.14-rc5,     bio_map_user_iov() and bio_unmap_user() in     'block/bio.c' do unbalanced pages refcounting if IO     vector has small consecutive buffers belonging to the     same page. bio_add_pc_page() merges them into one, but     the page reference is never dropped, causing a memory     leak and possible system lockup due to out-of-memory     condition.(CVE-2017-12190)An issue was discovered in     the Linux kernel before 4.19.3. crypto_report_one() and     related functions in crypto/crypto_user.c (the crypto     user configuration API) do not fully initialize     structures that are copied to userspace, potentially     leaking sensitive memory to user programs. NOTE: this     is a CVE-2013-2547 regression but with easier     exploitability because the attacker does not need a     capability (however, the system must have the     CONFIG_CRYPTO_USER kconfig option).(CVE-2018-19854)The     userfaultfd implementation in the Linux kernel before     4.19.7 mishandles access control for certain UFFDIO_     ioctl calls, as demonstrated by allowing local users to     write data into holes in a tmpfs file (if the user has     read-only access to that file, and that file contains     holes), related to fs/userfaultfd.c and     mm/userfaultfd.c.(CVE-2018-18397)The TCP stack in the     Linux kernel through 4.10.6 mishandles the     SCM_TIMESTAMPING_OPT_STATS feature, which allows local     users to obtain sensitive information from the kernel's     internal socket data structures or cause a denial of     service (out-of-bounds read) via crafted system calls,     related to net/core/skbuff.c and     net/socket.c.(CVE-2017-7277)A flaw was found in the way     the Linux kernel's vhost driver treated userspace     provided log file descriptor when processing the     VHOST_SET_LOG_FD ioctl command. The file descriptor was     never released and continued to consume kernel memory.
    A privileged local user with access to the     /dev/vhost-net files could use this flaw to create a     denial-of-service attack.(CVE-2015-6252)A buffer     overflow flaw was found in the way the Linux kernel's     virtio-net subsystem handled certain fraglists when the     GRO (Generic Receive Offload) functionality was enabled     in a bridged network configuration. An attacker on the     local network could potentially use this flaw to crash     the system, or, although unlikely, elevate their     privileges on the system.(CVE-2015-5156)The MSM QDSP6     audio driver (aka sound driver) for the Linux kernel     3.x, as used in Qualcomm Innovation Center (QuIC)     Android contributions for MSM devices and other     products, allows attackers to gain privileges or cause     a denial of service (integer overflow, and buffer     overflow or buffer over-read) via a crafted application     that performs a (1) AUDIO_EFFECTS_WRITE or (2)     AUDIO_EFFECTS_READ operation, aka Qualcomm internal bug     CR1006609.(CVE-2016-2068)The icmp6_send function in     net/ipv6/icmp.c in the Linux kernel through 4.8.12     omits a certain check of the dst data structure which     allows remote attackers to cause a denial of service     (panic) via a fragmented IPv6 packet.(CVE-2016-9919)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote OracleVM system is missing necessary patches to address critical security updates : please see Oracle VM Security Advisory OVMSA-2017-0174 for details.

The remote OracleVM system is missing necessary patches to address critical security updates : please see Oracle VM Security Advisory OVMSA-2017-0145 for details.

The remote Oracle Linux host is missing a security update for the kernel package(s).

The remote OracleVM system is missing necessary patches to address critical security updates : please see Oracle VM Security Advisory OVMSA-2017-0126 for details.

Linux 4.11

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the version of the vzkernel package and the readykernel-patch installed, the Virtuozzo installation on the remote host is affected by the following vulnerabilities :

  - The NFSv4 server in the Linux kernel compiled with     CONFIG_NFSD_PNFS enabled does not properly validate     layout type when processing NFSv4 pNFS LAYOUTGET and     GETDEVICEINFO operands. The attack payload fits to     single one-way UDP packet. The provided input value is     used for array dereferencing. This may lead to a remote     DoS of [knfsd] and so to a soft-lockup of a whole     system.

  - A flaw was found in the way Linux kernel allocates heap     memory to build the scattergather list from a fragment     list(skb_shinfo(skb)->frag_list) in the socket     buffer(skb_buff). The heap overflow occurred if     'MAX_SKB_FRAGS + 1' parameter and 'NETIF_F_FRAGLIST'     feature are both used together. A remote user or     process could use this flaw to potentially escalate     their privilege on a system.

  - A vulnerability was found in the implementation of     setsockopt() operations in the Linux kernel. A     privileged user inside a container could cause a DoS     attack on the host (kernel deadlock in ip_ra_control()     function) using a specially crafted sequence of system     calls.

Note that Tenable Network Security has extracted the preceding description block directly from the Virtuozzo security advisory.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote OracleVM system is missing necessary patches to address critical security updates :

  - macsec: dynamically allocate space for sglist (Jason A.
    Donenfeld) [Orabug: 26368162] (CVE-2017-7477)

  - macsec: avoid heap overflow in skb_to_sgvec (Jason A.
    Donenfeld) [Orabug: 26368162] (CVE-2017-7477)

  - nfsd: check for oversized NFSv2/v3 arguments (J. Bruce     Fields) [Orabug: 26366988] (CVE-2017-7645)

The remote Oracle Linux 6 / 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2017-3589 advisory.

    - macsec: dynamically allocate space for sglist (Jason A. Donenfeld)  [Orabug: 26368162]  {CVE-2017-7477}
    - macsec: avoid heap overflow in skb_to_sgvec (Jason A. Donenfeld)  [Orabug: 26368162]  {CVE-2017-7477}

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2017-1615 advisory.

    - [mm] enlarge stack guard gap (Larry Woodman) [1452732 1452733] {CVE-2017-1000364}
    - [fs] nfsd: stricter decoding of write-like NFSv2/v3 ops ('J. Bruce Fields') [1449282 1443204]     {CVE-2017-7895}
    - [fs] nfsd4: minor NFSv2/v3 write decoding cleanup ('J. Bruce Fields') [1449282 1443204] {CVE-2017-7895}
    - [fs] nfsd: check for oversized NFSv2/v3 arguments ('J. Bruce Fields') [1447642 1442407] {CVE-2017-7645}
    - [net] macsec: dynamically allocate space for sglist (Sabrina Dubroca) [1445546 1445545] {CVE-2017-7477}
    - [net] macsec: avoid heap overflow in skb_to_sgvec (Sabrina Dubroca) [1445546 1445545] {CVE-2017-7477}
    - [net] tcp: avoid infinite loop in tcp_splice_read() (Davide Caratti) [1430579 1430580] {CVE-2017-6214}
    - [x86] kvm: x86: fix emulation of 'MOV SS, null selector' (Radim Krcmar) [1414742 1414743]     {CVE-2017-2583}

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Description of changes:

- [3.10.0-514.26.1.0.1.el7.OL7]
- [ipc] ipc/sem.c: bugfix for semctl(,,GETZCNT) (Manfred Spraul) [orabug 22552377]
- Oracle Linux certificates (Alexey Petrenko)
- Oracle Linux RHCK Module Signing Key was compiled into kernel (olkmod_signing_key.x509)(<A HREF='https://oss.oracle.com/mailman/listinfo/el-errata'>alexey.petrenko at oracle.com</A>)
- Update x509.genkey [bug 24817676]

[3.10.0-514.26.1.el7]
- [mm] enlarge stack guard gap (Larry Woodman) [1452732 1452733] {CVE-2017-1000364}
- Revert: [md] dm mirror: use all available legs on multiple failures (Mike Snitzer) [1449176 1383444]

[3.10.0-514.25.1.el7]
- [lib] kobject: grab an extra reference on kobject->sd to allow duplicate deletes (Aristeu Rozanski) [1454851 1427252]
- [kernel] module: When modifying a module's text ignore modules which are going away too (Aaron Tomlin) [1454684 1386313]
- [kernel] module: Ensure a module's state is set accordingly during module coming cleanup code (Aaron Tomlin) [1454684 1386313]
- [net] vxlan: do not output confusing error message (Jiri Benc) [1454636 1445054]
- [net] vxlan: correctly handle ipv6.disable module parameter (Jiri Benc) [1454636 1445054]
- [iommu] vt-d: fix range computation when making room for large pages (Alex Williamson) [1450856 1435612]
- [fs] nfsd: stricter decoding of write-like NFSv2/v3 ops ('J. Bruce Fields') [1449282 1443204] {CVE-2017-7895}
- [fs] nfsd4: minor NFSv2/v3 write decoding cleanup ('J. Bruce Fields') [1449282 1443204] {CVE-2017-7895}
- [md] dm mirror: use all available legs on multiple failures (Mike Snitzer) [1449176 1383444]
- [fs] nfsd: check for oversized NFSv2/v3 arguments ('J. Bruce Fields') [1447642 1442407] {CVE-2017-7645}
- [scsi] ses: don't get power status of SES device slot on probe (Gustavo Duarte) [1446650 1434768]
- [scsi] ipr: do not set DID_PASSTHROUGH on CHECK CONDITION (Steve Best) [1446649 1441747]
- [net] macsec: dynamically allocate space for sglist (Sabrina Dubroca) [1445546 1445545] {CVE-2017-7477}
- [net] macsec: avoid heap overflow in skb_to_sgvec (Sabrina Dubroca) [1445546 1445545] {CVE-2017-7477}
- [fs] gfs2: Allow glocks to be unlocked after withdraw (Robert S Peterson) [1433882 1404005]
- [net] tcp: avoid infinite loop in tcp_splice_read() (Davide Caratti) [1430579 1430580] {CVE-2017-6214}
- [mm] vma_merge: correct false positive from 
__vma_unlink->validate_mm_rb (Andrea Arcangeli) [1428840 1374548]
- [mm] vma_merge: fix race vm_page_prot race condition against rmap_walk (Andrea Arcangeli) [1428840 1374548]
- [mm] fix use-after-free if memory allocation failed in vma_adjust() (Andrea Arcangeli) [1428840 1374548]
- [x86] kvm: x86: fix emulation of 'MOV SS, null selector' (Radim Krcmar) [1414742 1414743] {CVE-2017-2583}
- [powerpc] prom: Increase minimum RMA size to 512MB (Gustavo Duarte) [1450041 1411321]
- [pci] pciehp: Prioritize data-link event over presence detect (Myron Stowe) [1450124 1435818]
- [pci] pciehp: Don't re-read Slot Status when queuing hotplug event (Myron Stowe) [1450124 1435818]
- [pci] pciehp: Process all hotplug events before looking for new ones (Myron Stowe) [1450124 1435818]
- [pci] pciehp: Rename pcie_isr() locals for clarity (Myron Stowe) [1450124 1435818]

[3.10.0-514.24.1.el7]
- [scsi] lpfc: Fix panic on BFS configuration (Maurizio Lombardi) [1452044 1443116]
- [vfio] type1: Reduce repetitive calls in vfio_pin_pages_remote() (Alex Williamson) [1450855 1438403]
- [vfio] type1: Remove locked page accounting workqueue (Alex Williamson) [1450855 1438403]
- [fs] nfs: Allow getattr to also report readdirplus cache hits (Dave Wysochanski) [1450851 1442068]
- [fs] nfs: Be more targeted about readdirplus use when doing lookup/revalidation (Dave Wysochanski) [1450851 1442068]
- [fs] nfs: Fix a performance regression in readdir (Dave Wysochanski) [1450851 1442068]
- [x86] xen: do not re-use pirq number cached in pci device msi msg data (Vitaly Kuznetsov) [1450037 1433831]
- [powerpc] mm: Add missing global TLB invalidate if cxl is active (Steve Best) [1449178 1440776]
- [powerpc] boot: Fix zImage TOC alignment (Gustavo Duarte) [1444343 1395838]

[3.10.0-514.23.1.el7]
- [scsi] qla2xxx: Defer marking device lost when receiving an RSCN (Himanshu Madhani) [1446246 1436940]
- [scsi] qla2xxx: Fix typo in driver (Himanshu Madhani) [1446246 1436940]
- [scsi] qla2xxx: Fix crash in qla2xxx_eh_abort on bad ptr (Himanshu Madhani) [1446246 1436940]
- [scsi] qla2xxx: Avoid that issuing a LIP triggers a kernel crash (Himanshu Madhani) [1446246 1436940]
- [scsi] qla2xxx: Add fix to read correct register value for ISP82xx (Himanshu Madhani) [1446246 1436940]
- [scsi] qla2xxx: Disable the adapter and skip error recovery in case of register disconnect (Himanshu Madhani) [1446246 1436940]

[3.10.0-514.22.1.el7]
- [mm] hugetlb: don't use reserved during VM_SHARED mapping cow (Larry Woodman) [1445184 1385473]

An update for kernel is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es) :

* A flaw was found in the way Linux kernel allocates heap memory to build the scattergather list from a fragment list(skb_shinfo(skb)->frag_list) in the socket buffer(skb_buff). The heap overflow occurred if 'MAX_SKB_FRAGS + 1' parameter and 'NETIF_F_FRAGLIST' feature were used together. A remote user or process could use this flaw to potentially escalate their privilege on a system. (CVE-2017-7477, Important)

* The NFS2/3 RPC client could send long arguments to the NFS server.
These encoded arguments are stored in an array of memory pages, and accessed using pointer variables. Arbitrarily long arguments could make these pointers point outside the array and cause an out-of-bounds memory access. A remote user or program could use this flaw to crash the kernel (denial of service). (CVE-2017-7645, Important)

* The NFSv2 and NFSv3 server implementations in the Linux kernel through 4.10.13 lacked certain checks for the end of a buffer. A remote attacker could trigger a pointer-arithmetic error or possibly cause other unspecified impacts using crafted requests related to fs/nfsd/nfs3xdr.c and fs/nfsd/nfsxdr.c. (CVE-2017-7895, Important)

* The Linux kernel built with the Kernel-based Virtual Machine (CONFIG_KVM) support was vulnerable to an incorrect segment selector(SS) value error. The error could occur while loading values into the SS register in long mode. A user or process inside a guest could use this flaw to crash the guest, resulting in DoS or potentially escalate their privileges inside the guest.
(CVE-2017-2583, Moderate)

* A flaw was found in the Linux kernel's handling of packets with the URG flag. Applications using the splice() and tcp_splice_read() functionality could allow a remote attacker to force the kernel to enter a condition in which it could loop indefinitely. (CVE-2017-6214, Moderate)

Red Hat would like to thank Ari Kauppi for reporting CVE-2017-7895 and Xiaohan Zhang (Huawei Inc.) for reporting CVE-2017-2583.

Bug Fix(es) :

* Previously, the reserved-pages counter (HugePages_Rsvd) was bigger than the total-pages counter (HugePages_Total) in the /proc/meminfo file, and HugePages_Rsvd underflowed. With this update, the HugeTLB feature of the Linux kernel has been fixed, and HugePages_Rsvd underflow no longer occurs. (BZ#1445184)

* If a directory on a NFS client was modified while being listed, the NFS client could restart the directory listing multiple times.
Consequently, the performance of listing the directory was sub-optimal. With this update, the restarting of the directory listing happens less frequently. As a result, the performance of listing the directory while it is being modified has improved. (BZ#1450851)

* The Fibre Channel over Ethernet (FCoE) adapter in some cases failed to reboot. This update fixes the qla2xxx driver, and FCoE adapter now reboots as expected. (BZ#1446246)

* When a VM with Virtual Function I/O (VFIO) device was rebooted, the QEMU process occasionally terminated unexpectedly due to a failed VFIO Direct Memory Access (DMA) map request. This update fixes the vfio driver and QEMU no longer crashes in the described situation.
(BZ#1450855)

* When the operating system was booted with the in-box lpfc driver, a kernel panic occurred on the little-endian variant of IBM Power Systems. This update fixes lpfc, and the kernel no longer panics in the described situation. (BZ#1452044)

* When creating or destroying a VM with Virtual Function I/O (VFIO) devices with 'Hugepages' feature enabled, errors in Direct Memory Access (DMA) page table entry (PTE) mappings occurred, and QEMU memory usage behaved unpredictably. This update fixes range computation when making room for large pages in Input/Output Memory Management Unit (IOMMU). As a result, errors in DMA PTE mappings no longer occur, and QEMU has a predictable memory usage in the described situation.
(BZ#1450856)

Security Fix(es) :

  - A flaw was found in the way Linux kernel allocates heap     memory to build the scattergather list from a fragment     list(skb_shinfo(skb)->frag_list) in the socket     buffer(skb_buff). The heap overflow occurred if     'MAX_SKB_FRAGS

  - 1' parameter and 'NETIF_F_FRAGLIST' feature were used     together. A remote user or process could use this flaw     to potentially escalate their privilege on a system.
    (CVE-2017-7477, Important)

  - The NFS2/3 RPC client could send long arguments to the     NFS server. These encoded arguments are stored in an     array of memory pages, and accessed using pointer     variables. Arbitrarily long arguments could make these     pointers point outside the array and cause an     out-of-bounds memory access. A remote user or program     could use this flaw to crash the kernel (denial of     service). (CVE-2017-7645, Important)

  - The NFSv2 and NFSv3 server implementations in the Linux     kernel through 4.10.13 lacked certain checks for the end     of a buffer. A remote attacker could trigger a     pointer-arithmetic error or possibly cause other     unspecified impacts using crafted requests related to     fs/nfsd/nfs3xdr.c and fs/nfsd/nfsxdr.c. (CVE-2017-7895,     Important)

  - The Linux kernel built with the Kernel-based Virtual     Machine (CONFIG_KVM) support was vulnerable to an     incorrect segment selector(SS) value error. The error     could occur while loading values into the SS register in     long mode. A user or process inside a guest could use     this flaw to crash the guest, resulting in DoS or     potentially escalate their privileges inside the guest.
    (CVE-2017-2583, Moderate)

  - A flaw was found in the Linux kernel's handling of     packets with the URG flag. Applications using the     splice() and tcp_splice_read() functionality could allow     a remote attacker to force the kernel to enter a     condition in which it could loop indefinitely.
    (CVE-2017-6214, Moderate)

Bug Fix(es) :

  - Previously, the reserved-pages counter (HugePages_Rsvd)     was bigger than the total-pages counter     (HugePages_Total) in the /proc/meminfo file, and     HugePages_Rsvd underflowed. With this update, the     HugeTLB feature of the Linux kernel has been fixed, and     HugePages_Rsvd underflow no longer occurs.

  - If a directory on a NFS client was modified while being     listed, the NFS client could restart the directory     listing multiple times. Consequently, the performance of     listing the directory was sub-optimal. With this update,     the restarting of the directory listing happens less     frequently. As a result, the performance of listing the     directory while it is being modified has improved.

  - The Fibre Channel over Ethernet (FCoE) adapter in some     cases failed to reboot. This update fixes the qla2xxx     driver, and FCoE adapter now reboots as expected.

  - When a VM with Virtual Function I/O (VFIO) device was     rebooted, the QEMU process occasionally terminated     unexpectedly due to a failed VFIO Direct Memory Access     (DMA) map request. This update fixes the vfio driver and     QEMU no longer crashes in the described situation.

  - When the operating system was booted with the in-box     lpfc driver, a kernel panic occurred on the     little-endian variant of IBM Power Systems. This update     fixes lpfc, and the kernel no longer panics in the     described situation.

  - When creating or destroying a VM with Virtual Function     I/O (VFIO) devices with 'Hugepages' feature enabled,     errors in Direct Memory Access (DMA) page table entry     (PTE) mappings occurred, and QEMU memory usage behaved     unpredictably. This update fixes range computation when     making room for large pages in Input/Output Memory     Management Unit (IOMMU). As a result, errors in DMA PTE     mappings no longer occur, and QEMU has a predictable     memory usage in the described situation.

An update for kernel-rt is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

Security Fix(es) :

* A flaw was found in the way memory was being allocated on the stack for user space binaries. If heap (or different memory region) and stack memory regions were adjacent to each other, an attacker could use this flaw to jump over the stack guard gap, cause controlled memory corruption on process stack or the adjacent memory region, and thus increase their privileges on the system. This is a kernel-side mitigation which increases the stack guard gap size from one page to 1 MiB to make successful exploitation of this issue more difficult.
(CVE-2017-1000364, Important)

* A flaw was found in the way Linux kernel allocates heap memory to build the scattergather list from a fragment list(skb_shinfo(skb)->frag_list) in the socket buffer(skb_buff). The heap overflow occurred if 'MAX_SKB_FRAGS + 1' parameter and 'NETIF_F_FRAGLIST' feature are both used together. A remote user or process could use this flaw to potentially escalate their privilege on a system. (CVE-2017-7477, Important)

* The NFS2/3 RPC client could send long arguments to the NFS server.
These encoded arguments are stored in an array of memory pages, and accessed using pointer variables. Arbitrarily long arguments could make these pointers point outside the array and cause an out-of-bounds memory access. A remote user or program could use this flaw to crash the kernel, resulting in denial of service. (CVE-2017-7645, Important)

* The NFSv2 and NFSv3 server implementations in the Linux kernel through 4.10.13 lacked certain checks for the end of a buffer. A remote attacker could trigger a pointer-arithmetic error or possibly cause other unspecified impacts using crafted requests related to fs/nfsd/nfs3xdr.c and fs/nfsd/nfsxdr.c. (CVE-2017-7895, Important)

* Linux kernel built with the Kernel-based Virtual Machine (CONFIG_KVM) support was vulnerable to an incorrect segment selector(SS) value error. The error could occur while loading values into the SS register in long mode. A user or process inside a guest could use this flaw to crash the guest, resulting in DoS or potentially escalate their privileges inside the guest.
(CVE-2017-2583, Moderate)

* A flaw was found in the Linux kernel's handling of packets with the URG flag. Applications using the splice() and tcp_splice_read() functionality could allow a remote attacker to force the kernel to enter a condition in which it could loop indefinitely. (CVE-2017-6214, Moderate)

Red Hat would like to thank Qualys Research Labs for reporting CVE-2017-1000364; Ari Kauppi for reporting CVE-2017-7895; and Xiaohan Zhang (Huawei Inc.) for reporting CVE-2017-2583.

Bug Fix(es) :

* The kernel-rt packages have been upgraded to the 3.10.0-514.25.2 source tree, which provides a number of bug fixes over the previous version. (BZ# 1452742)

* Previously, a local lock acquisition around the ip_send_unicast_reply() function was incorrectly terminated.
Consequently, a list corruption occurred that led to a kernel panic.
This update adds locking functions around calls to ip_send_unicast_reply(). As a result, neither list corruption nor kernel panic occur under the described circumstances. (BZ# 1455239)

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2017:1615 advisory.

    The kernel packages contain the Linux kernel, the core of any Linux operating system.

    Security Fix(es):

    * A flaw was found in the way Linux kernel allocates heap memory to build the scattergather list from a     fragment list(skb_shinfo(skb)->frag_list) in     the socket buffer(skb_buff). The heap overflow occurred if 'MAX_SKB_FRAGS + 1' parameter and     'NETIF_F_FRAGLIST' feature were used together. A     remote user or process could use this flaw to potentially escalate their privilege on a system.
    (CVE-2017-7477, Important)

    * The NFS2/3 RPC client could send long arguments to the NFS server. These encoded arguments are stored in     an array of memory pages, and accessed using pointer variables. Arbitrarily long arguments could make     these pointers point outside the array and cause an out-of-bounds memory access. A remote user or program     could use this flaw to crash the kernel (denial of service). (CVE-2017-7645, Important)

    * The NFSv2 and NFSv3 server implementations in the Linux kernel through 4.10.13 lacked certain checks for     the end of a buffer. A remote attacker could trigger a pointer-arithmetic error or possibly cause other     unspecified impacts using crafted requests related to fs/nfsd/nfs3xdr.c and fs/nfsd/nfsxdr.c.
    (CVE-2017-7895, Important)

    * The Linux kernel built with the Kernel-based Virtual Machine (CONFIG_KVM) support was vulnerable to an     incorrect segment selector(SS) value error. The error could occur while loading values into the SS     register in long mode. A user or process inside a guest could use this flaw to crash the guest, resulting     in DoS or potentially escalate their privileges inside the guest. (CVE-2017-2583, Moderate)

    * A flaw was found in the Linux kernel's handling of packets with the URG flag. Applications using the     splice() and tcp_splice_read() functionality could allow a remote attacker to force the kernel to enter a     condition in which it could loop indefinitely. (CVE-2017-6214, Moderate)

    Red Hat would like to thank Ari Kauppi for reporting CVE-2017-7895 and Xiaohan Zhang (Huawei Inc.) for     reporting CVE-2017-2583.

    Bug Fix(es):

    * Previously, the reserved-pages counter (HugePages_Rsvd) was bigger than the total-pages counter     (HugePages_Total) in the /proc/meminfo file, and HugePages_Rsvd underflowed. With this update, the HugeTLB     feature of the Linux kernel has been fixed, and HugePages_Rsvd underflow no longer occurs. (BZ#1445184)

    * If a directory on a NFS client was modified while being listed, the NFS client could restart the     directory listing multiple times. Consequently, the performance of listing the directory was sub-optimal.
    With this update, the restarting of the directory listing happens less frequently. As a result, the     performance of listing the directory while it is being modified has improved. (BZ#1450851)

    * The Fibre Channel over Ethernet (FCoE) adapter in some cases failed to reboot. This update fixes the     qla2xxx driver, and FCoE adapter now reboots as expected. (BZ#1446246)

    * When a VM with Virtual Function I/O (VFIO) device was rebooted, the QEMU process occasionally terminated     unexpectedly due to a failed VFIO Direct Memory Access (DMA) map request. This update fixes the vfio     driver and QEMU no longer crashes in the described situation. (BZ#1450855)

    * When the operating system was booted with the in-box lpfc driver, a kernel panic occurred on the little-     endian variant of IBM Power Systems. This update fixes lpfc, and the kernel no longer panics in the     described situation. (BZ#1452044)

    * When creating or destroying a VM with Virtual Function I/O (VFIO) devices with Hugepages feature     enabled, errors in Direct Memory Access (DMA) page table entry (PTE) mappings occurred, and QEMU memory     usage behaved unpredictably. This update fixes range computation when making room for large pages in     Input/Output Memory Management Unit (IOMMU). As a result, errors in DMA PTE mappings no longer occur, and     QEMU has a predictable memory usage in the described situation. (BZ#1450856)

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Dmitry Vyukov discovered that KVM implementation in the Linux kernel improperly emulated the VMXON instruction. A local attacker in a guest OS could use this to cause a denial of service (memory consumption) in the host OS. (CVE-2017-2596)

Dmitry Vyukov discovered that the generic SCSI (sg) subsystem in the Linux kernel contained a stack-based buffer overflow. A local attacker with access to an sg device could use this to cause a denial of service (system crash) or possibly execute arbitrary code.
(CVE-2017-7187)

It was discovered that a NULL pointer dereference existed in the Direct Rendering Manager (DRM) driver for VMware devices in the Linux kernel. A local attacker could use this to cause a denial of service (system crash). (CVE-2017-7261)

Li Qiang discovered that an integer overflow vulnerability existed in the Direct Rendering Manager (DRM) driver for VMware devices in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.
(CVE-2017-7294)

Jason Donenfeld discovered a heap overflow in the MACsec module in the Linux kernel. An attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-7477)

It was discovered that an information leak existed in the set_mempolicy and mbind compat syscalls in the Linux kernel. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2017-7616).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Ubuntu 16.04 LTS host has a package installed that is affected by a vulnerability as referenced in the USN-3292-2 advisory.

    USN-3292-1 fixed a vulnerability in the Linux kernel for Ubuntu 16.10. This update provides the     corresponding updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu 16.10 for Ubuntu 16.04     LTS.

    Jason Donenfeld discovered a heap overflow in the MACsec module in the Linux kernel. An attacker could use     this to cause a denial of service (system crash) or possibly execute arbitrary code.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Jason Donenfeld discovered a heap overflow in the MACsec module in the Linux kernel. An attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The 4.10.13 stable kernel update contains a number of important fixes across the tree.

----

The 4.10.12 stable kernel update contains a number of important fixes across the tree.

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The 4.10.13 stable update contains a number of important fixes across the tree.

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
124984	EulerOS Virtualization for ARM 64 3.0.1.0 : kernel (EulerOS-SA-2019-1531)	Nessus	Huawei Local Security Checks	high
105248	OracleVM 3.4 : Unbreakable / etc (OVMSA-2017-0174) (BlueBorne) (Dirty COW) (Stack Clash)	Nessus	OracleVM Local Security Checks	high
102774	OracleVM 3.4 : Unbreakable / etc (OVMSA-2017-0145) (Stack Clash)	Nessus	OracleVM Local Security Checks	critical
102511	Oracle Linux 7 : kernel (ELSA-2017-1842-1) (Stack Clash)	Nessus	Oracle Linux Local Security Checks	critical
102064	OracleVM 3.4 : Unbreakable / etc (OVMSA-2017-0126) (Stack Clash)	Nessus	OracleVM Local Security Checks	critical
101687	Fedora 26 : kernel (2017-9b50e28441)	Nessus	Fedora Local Security Checks	high
101234	Virtuozzo 7 : readykernel-patch (VZA-2017-063)	Nessus	Virtuozzo Local Security Checks	high
101198	OracleVM 3.4 : Unbreakable / etc (OVMSA-2017-0119)	Nessus	OracleVM Local Security Checks	high
101192	Oracle Linux 6 / 7 : Unbreakable Enterprise kernel (ELSA-2017-3589)	Nessus	Oracle Linux Local Security Checks	high
101139	Oracle Linux 7 : kernel (ELSA-2017-1615)	Nessus	Oracle Linux Local Security Checks	critical
101138	Oracle Linux 7 : kernel (ELSA-2017-1615-1) (Stack Clash)	Nessus	Oracle Linux Local Security Checks	high
101120	CentOS 7 : kernel (CESA-2017:1615)	Nessus	CentOS Local Security Checks	critical
101105	Scientific Linux Security Update : kernel on SL7.x x86_64 (20170628)	Nessus	Scientific Linux Local Security Checks	critical
101102	RHEL 7 : kernel-rt (RHSA-2017:1616) (Stack Clash)	Nessus	Red Hat Local Security Checks	critical
101101	RHEL 7 : kernel (RHSA-2017:1615)	Nessus	Red Hat Local Security Checks	critical
100255	Ubuntu 17.04 : linux, linux-raspi2 vulnerabilities (USN-3293-1)	Nessus	Ubuntu Local Security Checks	high
100254	Ubuntu 16.04 LTS : Linux kernel (HWE) vulnerability (USN-3292-2)	Nessus	Ubuntu Local Security Checks	high
100253	Ubuntu 16.10 : linux, linux-raspi2 vulnerability (USN-3292-1)	Nessus	Ubuntu Local Security Checks	high
99987	Fedora 24 : kernel (2017-0aa0f69e0c)	Nessus	Fedora Local Security Checks	high
99923	Fedora 25 : kernel (2017-17d1c05236)	Nessus	Fedora Local Security Checks	high

Detections

Analytics

CVE-2017-7477

high

Tenable Plugins

high

high

critical

critical

critical

high

high

high

high

critical

high

critical

critical

critical

critical

high

high

high

high

high