An information disclosure vulnerability exists in the /proc/pid/syscall functionality of Linux Kernel 5.1 Stable and 5.4.66. More specifically, this issue has been introduced in v5.1-rc4 (commit 631b7abacd02b88f4b0795c08b54ad4fc3e7c7c0) and is still present in v5.10-rc4, so it’s likely that all versions in between are affected. An attacker can read /proc/pid/syscall to trigger this vulnerability, which leads to the kernel leaking memory contents.

The remote Oracle Linux 7 / 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2021-9140 advisory.

    - bpf, selftests: Fix up some test_verifier cases for unprivileged (Piotr Krysiuk)  [Orabug: 32656761]     {CVE-2020-27170} {CVE-2020-27171}
    - bpf: Add sanity check for upper ptr_limit (Piotr Krysiuk)  [Orabug: 32656761]  {CVE-2020-27170}     {CVE-2020-27171}
    - bpf: Simplify alu_limit masking for pointer arithmetic (Piotr Krysiuk)  [Orabug: 32656761]     {CVE-2020-27170} {CVE-2020-27171}
    - bpf: Fix off-by-one for area size in creating mask to left (Piotr Krysiuk)  [Orabug: 32656761]     {CVE-2020-27170} {CVE-2020-27171}
    - bpf: Prohibit alu ops for pointer types not defining ptr_limit (Piotr Krysiuk)  [Orabug: 32656761]     {CVE-2020-27170} {CVE-2020-27171}
    - selftests/bpf: Test access to bpf map pointer (Andrey Ignatov)  [Orabug: 32656761]  {CVE-2020-27170}     {CVE-2020-27171}
    - bpf: Fix truncation handling for mod32 dst reg wrt zero (Daniel Borkmann)  [Orabug: 32673813]     {CVE-2021-3444}
    - bpf: Fix 32 bit src register truncation on div/mod (Daniel Borkmann)  [Orabug: 32673813]     {CVE-2021-3444}
    - scsi: iscsi: Verify lengths on passthrough PDUs (Chris Leech)  [Orabug: 32603378]  {CVE-2021-27363}     {CVE-2021-27364} {CVE-2021-27365}
    - scsi: iscsi: Ensure sysfs attributes are limited to PAGE_SIZE (Chris Leech)  [Orabug: 32603378]     {CVE-2021-27363} {CVE-2021-27364} {CVE-2021-27365}
    - scsi: iscsi: Report connection state in sysfs (Gabriel Krisman Bertazi)  [Orabug: 32603378]     {CVE-2021-27363} {CVE-2021-27364} {CVE-2021-27365}
    - sysfs: Add sysfs_emit and sysfs_emit_at to format sysfs output (Joe Perches)  [Orabug: 32603378]     {CVE-2021-27363} {CVE-2021-27364} {CVE-2021-27365}
    - scsi: iscsi: Restrict sessions and handles to admin capabilities (Lee Duncan)  [Orabug: 32603378]     {CVE-2021-27363} {CVE-2021-27364} {CVE-2021-27365}
    - drm/nouveau: bail out of nouveau_channel_new if channel init fails (Frantisek Hrbata)  [Orabug:
    32591559]  {CVE-2020-25639}
    - xen-blkback: fix error handling in xen_blkbk_map() (Jan Beulich)  [Orabug: 32492108]  {CVE-2021-26930}
    - xen-scsiback: dont handle error by BUG() (Jan Beulich)  [Orabug: 32492100]  {CVE-2021-26931}
    - xen-netback: dont handle error by BUG() (Jan Beulich)  [Orabug: 32492100]  {CVE-2021-26931}
    - xen-blkback: dont handle error by BUG() (Jan Beulich)  [Orabug: 32492100]  {CVE-2021-26931}
    - Xen/gntdev: correct error checking in gntdev_map_grant_pages() (Jan Beulich)  [Orabug: 32492092]     {CVE-2021-26932}
    - Xen/gntdev: correct dev_bus_addr handling in gntdev_map_grant_pages() (Jan Beulich)  [Orabug: 32492092]     {CVE-2021-26932}
    - Xen/x86: also check kernel mapping in set_foreign_p2m_mapping() (Jan Beulich)  [Orabug: 32492092]     {CVE-2021-26932}
    - Xen/x86: dont bail early from clear_foreign_p2m_mapping() (Jan Beulich)  [Orabug: 32492092]     {CVE-2021-26932}
    - nbd: freeze the queue while were adding connections (Josef Bacik)  [Orabug: 32447284]  {CVE-2021-3348}
    - futex: Handle faults correctly for PI futexes (Thomas Gleixner)  [Orabug: 32447185]  {CVE-2021-3347}
    - futex: Simplify fixup_pi_state_owner() (Thomas Gleixner)  [Orabug: 32447185]  {CVE-2021-3347}
    - futex: Use pi_state_update_owner() in put_pi_state() (Thomas Gleixner)  [Orabug: 32447185]     {CVE-2021-3347}
    - rtmutex: Remove unused argument from rt_mutex_proxy_unlock() (Thomas Gleixner)  [Orabug: 32447185]     {CVE-2021-3347}
    - futex: Provide and use pi_state_update_owner() (Thomas Gleixner)  [Orabug: 32447185]  {CVE-2021-3347}
    - futex: Replace pointless printk in fixup_owner() (Thomas Gleixner)  [Orabug: 32447185]  {CVE-2021-3347}
    - futex: Ensure the correct return value from futex_lock_pi() (Thomas Gleixner)  [Orabug: 32447185]     {CVE-2021-3347}
    - netfilter: add and use nf_hook_slow_list() (Florian Westphal)  [Orabug: 32372529]  {CVE-2021-20177}
    - target: fix XCOPY NAA identifier lookup (David Disseldorp)  [Orabug: 32374281]  {CVE-2020-28374}
    - mwifiex: Fix possible buffer overflows in mwifiex_cmd_802_11_ad_hoc_start (Zhang Xiaohui)  [Orabug:
    32349202]  {CVE-2020-36158}
    - xen-blkback: set ring->xenblkd to NULL after kthread_stop() (Pawel Wieczorkiewicz)  [Orabug: 32260251]     {CVE-2020-29569}
    - xenbus/xenbus_backend: Disallow pending watch messages (SeongJae Park)  [Orabug: 32253408]     {CVE-2020-29568}
    - xen/xenbus: Count pending messages for each watch (SeongJae Park)  [Orabug: 32253408]  {CVE-2020-29568}
    - xen/xenbus/xen_bus_type: Support will_handle watch callback (SeongJae Park)  [Orabug: 32253408]     {CVE-2020-29568}
    - xen/xenbus: Add will_handle callback support in xenbus_watch_path() (SeongJae Park)  [Orabug: 32253408]     {CVE-2020-29568}
    - xen/xenbus: Allow watches discard events before queueing (SeongJae Park)  [Orabug: 32253408]     {CVE-2020-29568}
    - futex: Fix inode life-time issue (Peter Zijlstra)  [Orabug: 32233513]  {CVE-2020-14381}
    - lib/syscall: fix syscall registers retrieval on 32-bit platforms (Willy Tarreau)   {CVE-2020-28588}

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 / 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2021-9141 advisory.

    - bpf, selftests: Fix up some test_verifier cases for unprivileged (Piotr Krysiuk)  [Orabug: 32656761]     {CVE-2020-27170} {CVE-2020-27171}
    - bpf: Add sanity check for upper ptr_limit (Piotr Krysiuk)  [Orabug: 32656761]  {CVE-2020-27170}     {CVE-2020-27171}
    - bpf: Simplify alu_limit masking for pointer arithmetic (Piotr Krysiuk)  [Orabug: 32656761]     {CVE-2020-27170} {CVE-2020-27171}
    - bpf: Fix off-by-one for area size in creating mask to left (Piotr Krysiuk)  [Orabug: 32656761]     {CVE-2020-27170} {CVE-2020-27171}
    - bpf: Prohibit alu ops for pointer types not defining ptr_limit (Piotr Krysiuk)  [Orabug: 32656761]     {CVE-2020-27170} {CVE-2020-27171}
    - selftests/bpf: Test access to bpf map pointer (Andrey Ignatov)  [Orabug: 32656761]  {CVE-2020-27170}     {CVE-2020-27171}
    - bpf: Fix truncation handling for mod32 dst reg wrt zero (Daniel Borkmann)  [Orabug: 32673813]     {CVE-2021-3444}
    - bpf: Fix 32 bit src register truncation on div/mod (Daniel Borkmann)  [Orabug: 32673813]     {CVE-2021-3444}
    - scsi: iscsi: Verify lengths on passthrough PDUs (Chris Leech)  [Orabug: 32603378]  {CVE-2021-27363}     {CVE-2021-27364} {CVE-2021-27365}
    - scsi: iscsi: Ensure sysfs attributes are limited to PAGE_SIZE (Chris Leech)  [Orabug: 32603378]     {CVE-2021-27363} {CVE-2021-27364} {CVE-2021-27365}
    - scsi: iscsi: Report connection state in sysfs (Gabriel Krisman Bertazi)  [Orabug: 32603378]     {CVE-2021-27363} {CVE-2021-27364} {CVE-2021-27365}
    - sysfs: Add sysfs_emit and sysfs_emit_at to format sysfs output (Joe Perches)  [Orabug: 32603378]     {CVE-2021-27363} {CVE-2021-27364} {CVE-2021-27365}
    - scsi: iscsi: Restrict sessions and handles to admin capabilities (Lee Duncan)  [Orabug: 32603378]     {CVE-2021-27363} {CVE-2021-27364} {CVE-2021-27365}
    - drm/nouveau: bail out of nouveau_channel_new if channel init fails (Frantisek Hrbata)  [Orabug:
    32591559]  {CVE-2020-25639}

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 Ubuntu 18.04 LTS / 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-4750-1 advisory.

    Bodong Zhao discovered a use-after-free in the Sun keyboard driver implementation in the Linux kernel. A     local attacker could use this to cause a denial of service or possibly execute arbitrary code.
    (CVE-2020-25669)

    It was discovered that the jfs file system implementation in the Linux kernel contained an out-of-bounds     read vulnerability. A local attacker could use this to possibly cause a denial of service (system crash).
    (CVE-2020-27815)

    Shisong Qin and Bodong Zhao discovered that Speakup screen reader driver in the Linux kernel did not     correctly handle setting line discipline in some situations. A local attacker could use this to cause a     denial of service (system crash). (CVE-2020-27830, CVE-2020-28941)

    It was discovered that an information leak existed in the syscall implementation in the Linux kernel on 32     bit systems. A local attacker could use this to expose sensitive information (kernel memory).
    (CVE-2020-28588)

    Michael Kurth and Pawel Wieczorkiewicz discovered that the Xen event processing backend in the Linux     kernel did not properly limit the number of events queued. An attacker in a guest VM could use this to     cause a denial of service in the host OS. (CVE-2020-29568)

    Olivier Benjamin and Pawel Wieczorkiewicz discovered a race condition the Xen paravirt block backend in     the Linux kernel, leading to a use-after-free vulnerability. An attacker in a guest VM could use this to     cause a denial of service in the host OS. (CVE-2020-29569)

    Jann Horn discovered that the tty subsystem of the Linux kernel did not use consistent locking in some     situations, leading to a read-after-free vulnerability. A local attacker could use this to cause a denial     of service (system crash) or possibly expose sensitive information (kernel memory). (CVE-2020-29660)

    Jann Horn discovered a race condition in the tty subsystem of the Linux kernel in the locking for the     TIOCSPGRP ioctl(), leading to a use-after- free vulnerability. A local attacker could use this to cause a     denial of service (system crash) or possibly execute arbitrary code. (CVE-2020-29661)

    It was discovered that the netfilter subsystem in the Linux kernel did not properly handle filter rules in     some situations. A local attacker with the CAP_NET_ADMIN capability could use this to cause a denial of     service. (CVE-2021-20177)

Tenable has extracted the preceding description block directly from the Ubuntu 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 Ubuntu 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-4752-1 advisory.

    Daniele Antonioli, Nils Ole Tippenhauer, and Kasper Rasmussen discovered that legacy pairing and secure-     connections pairing authentication in the Bluetooth protocol could allow an unauthenticated user to     complete authentication without pairing credentials via adjacent access. A physically proximate attacker     could use this to impersonate a previously paired Bluetooth device. (CVE-2020-10135)

    Jay Shin discovered that the ext4 file system implementation in the Linux kernel did not properly handle     directory access with broken indexing, leading to an out-of-bounds read vulnerability. A local attacker     could use this to cause a denial of service (system crash). (CVE-2020-14314)

    It was discovered that the block layer implementation in the Linux kernel did not properly perform     reference counting in some situations, leading to a use-after-free vulnerability. A local attacker could     use this to cause a denial of service (system crash). (CVE-2020-15436)

    It was discovered that the serial port driver in the Linux kernel did not properly initialize a pointer in     some situations. A local attacker could possibly use this to cause a denial of service (system crash).
    (CVE-2020-15437)

    Andy Nguyen discovered that the Bluetooth HCI event packet parser in the Linux kernel did not properly     handle event advertisements of certain sizes, leading to a heap-based buffer overflow. A physically     proximate remote attacker could use this to cause a denial of service (system crash) or possibly execute     arbitrary code. (CVE-2020-24490)

    It was discovered that the NFS client implementation in the Linux kernel did not properly perform bounds     checking before copying security labels in some situations. A local attacker could use this to cause a     denial of service (system crash) or possibly execute arbitrary code. (CVE-2020-25212)

    It was discovered that the Rados block device (rbd) driver in the Linux kernel did not properly perform     privilege checks for access to rbd devices in some situations. A local attacker could use this to map or     unmap rbd block devices. (CVE-2020-25284)

    It was discovered that the block layer subsystem in the Linux kernel did not properly handle zero-length     requests. A local attacker could use this to cause a denial of service. (CVE-2020-25641)

    It was discovered that the HDLC PPP implementation in the Linux kernel did not properly validate input in     some situations. A local attacker could use this to cause a denial of service (system crash) or possibly     execute arbitrary code. (CVE-2020-25643)

    Kiyin () discovered that the perf subsystem in the Linux kernel did not properly deallocate memory     in some situations. A privileged attacker could use this to cause a denial of service (kernel memory     exhaustion). (CVE-2020-25704)

    It was discovered that the KVM hypervisor in the Linux kernel did not properly handle interrupts in     certain situations. A local attacker in a guest VM could possibly use this to cause a denial of service     (host system crash). (CVE-2020-27152)

    It was discovered that the jfs file system implementation in the Linux kernel contained an out-of-bounds     read vulnerability. A local attacker could use this to possibly cause a denial of service (system crash).
    (CVE-2020-27815)

    It was discovered that an information leak existed in the syscall implementation in the Linux kernel on 32     bit systems. A local attacker could use this to expose sensitive information (kernel memory).
    (CVE-2020-28588)

    It was discovered that the framebuffer implementation in the Linux kernel did not properly perform range     checks in certain situations. A local attacker could use this to expose sensitive information (kernel     memory). (CVE-2020-28915)

    Jann Horn discovered a race condition in the copy-on-write implementation in the Linux kernel when     handling hugepages. A local attacker could use this to gain unintended write access to read-only memory     pages. (CVE-2020-29368)

    Jann Horn discovered that the mmap implementation in the Linux kernel contained a race condition when     handling munmap() operations, leading to a read-after-free vulnerability. A local attacker could use this     to cause a denial of service (system crash) or possibly expose sensitive information. (CVE-2020-29369)

    Jann Horn discovered that the romfs file system in the Linux kernel did not properly validate file system     meta-data, leading to an out-of-bounds read. An attacker could use this to construct a malicious romfs     image that, when mounted, exposed sensitive information (kernel memory). (CVE-2020-29371)

    Jann Horn discovered that the tty subsystem of the Linux kernel did not use consistent locking in some     situations, leading to a read-after-free vulnerability. A local attacker could use this to cause a denial     of service (system crash) or possibly expose sensitive information (kernel memory). (CVE-2020-29660)

    Jann Horn discovered a race condition in the tty subsystem of the Linux kernel in the locking for the     TIOCSPGRP ioctl(), leading to a use-after- free vulnerability. A local attacker could use this to cause a     denial of service (system crash) or possibly execute arbitrary code. (CVE-2020-29661)

    It was discovered that a race condition existed that caused the Linux kernel to not properly restrict exit     signal delivery. A local attacker could possibly use this to send signals to arbitrary processes.
    (CVE-2020-35508)

Tenable has extracted the preceding description block directly from the Ubuntu 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 Ubuntu 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-4751-1 advisory.

    It was discovered that the console keyboard driver in the Linux kernel contained a race condition. A local     attacker could use this to expose sensitive information (kernel memory). (CVE-2020-25656)

    Minh Yuan discovered that the tty driver in the Linux kernel contained race conditions when handling     fonts. A local attacker could possibly use this to expose sensitive information (kernel memory).
    (CVE-2020-25668)

    Bodong Zhao discovered a use-after-free in the Sun keyboard driver implementation in the Linux kernel. A     local attacker could use this to cause a denial of service or possibly execute arbitrary code.
    (CVE-2020-25669)

    Kiyin () discovered that the perf subsystem in the Linux kernel did not properly deallocate memory     in some situations. A privileged attacker could use this to cause a denial of service (kernel memory     exhaustion). (CVE-2020-25704)

    Julien Grall discovered that the Xen dom0 event handler in the Linux kernel did not properly limit the     number of events queued. An attacker in a guest VM could use this to cause a denial of service in the host     OS. (CVE-2020-27673)

    Jinoh Kang discovered that the Xen event channel infrastructure in the Linux kernel contained a race     condition. An attacker in guest could possibly use this to cause a denial of service (dom0 crash).
    (CVE-2020-27675)

    Daniel Axtens discovered that PowerPC RTAS implementation in the Linux kernel did not properly restrict     memory accesses in some situations. A privileged local attacker could use this to arbitrarily modify     kernel memory, potentially bypassing kernel lockdown restrictions. (CVE-2020-27777)

    It was discovered that the jfs file system implementation in the Linux kernel contained an out-of-bounds     read vulnerability. A local attacker could use this to possibly cause a denial of service (system crash).
    (CVE-2020-27815)

    Shisong Qin and Bodong Zhao discovered that Speakup screen reader driver in the Linux kernel did not     correctly handle setting line discipline in some situations. A local attacker could use this to cause a     denial of service (system crash). (CVE-2020-27830, CVE-2020-28941)

    It was discovered that a use-after-free vulnerability existed in the infiniband hfi1 device driver in the     Linux kernel. A local attacker could possibly use this to cause a denial of service (system crash).
    (CVE-2020-27835)

    It was discovered that an information leak existed in the syscall implementation in the Linux kernel on 32     bit systems. A local attacker could use this to expose sensitive information (kernel memory).
    (CVE-2020-28588)

    Minh Yuan discovered that the framebuffer console driver in the Linux kernel did not properly handle fonts     in some conditions. A local attacker could use this to cause a denial of service (system crash) or     possibly expose sensitive information (kernel memory). (CVE-2020-28974)

    Michael Kurth and Pawel Wieczorkiewicz discovered that the Xen event processing backend in the Linux     kernel did not properly limit the number of events queued. An attacker in a guest VM could use this to     cause a denial of service in the host OS. (CVE-2020-29568)

    Olivier Benjamin and Pawel Wieczorkiewicz discovered a race condition the Xen paravirt block backend in     the Linux kernel, leading to a use-after-free vulnerability. An attacker in a guest VM could use this to     cause a denial of service in the host OS. (CVE-2020-29569)

    Jann Horn discovered that the tty subsystem of the Linux kernel did not use consistent locking in some     situations, leading to a read-after-free vulnerability. A local attacker could use this to cause a denial     of service (system crash) or possibly expose sensitive information (kernel memory). (CVE-2020-29660)

    Jann Horn discovered a race condition in the tty subsystem of the Linux kernel in the locking for the     TIOCSPGRP ioctl(), leading to a use-after- free vulnerability. A local attacker could use this to cause a     denial of service (system crash) or possibly execute arbitrary code. (CVE-2020-29661)

    It was discovered that a race condition existed that caused the Linux kernel to not properly restrict exit     signal delivery. A local attacker could possibly use this to send signals to arbitrary processes.
    (CVE-2020-35508)

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

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

ID	Name	Product	Family	Severity
148459	Oracle Linux 7 / 8 : Unbreakable Enterprise kernel (ELSA-2021-9140)	Nessus	Oracle Linux Local Security Checks	high
148458	Oracle Linux 7 / 8 : Unbreakable Enterprise kernel-container (ELSA-2021-9141)	Nessus	Oracle Linux Local Security Checks	high
148009	Ubuntu 18.04 LTS / 20.04 LTS : Linux kernel vulnerabilities (USN-4750-1)	Nessus	Ubuntu Local Security Checks	high
147982	Ubuntu 20.04 LTS : Linux kernel (OEM) vulnerabilities (USN-4752-1)	Nessus	Ubuntu Local Security Checks	high
147978	Ubuntu 20.04 LTS : Linux kernel vulnerabilities (USN-4751-1)	Nessus	Ubuntu Local Security Checks	high

Detections

Analytics

CVE-2020-28588

medium

Tenable Plugins

high

high

high

high

high