An update for kernel is now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having a security impact of Moderate. 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) :

* It was found that reporting emulation failures to user space could lead to either a local (CVE-2014-7842) or a L2->L1 (CVE-2010-5313) denial of service. In the case of a local denial of service, an attacker must have access to the MMIO area or be able to access an I/O port. Please note that on certain systems, HPET is mapped to userspace as part of vdso (vvar) and thus an unprivileged user may generate MMIO transactions (and enter the emulator) this way. (CVE-2010-5313, CVE-2014-7842, Moderate)

* It was found that the Linux kernel did not properly account file descriptors passed over the unix socket against the process limit. A local user could use this flaw to exhaust all available memory on the system. (CVE-2013-4312, Moderate)

* 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, Moderate)

* It was found that the Linux kernel's IPv6 network stack did not properly validate the value of the MTU variable when it was set. A remote attacker could potentially use this flaw to disrupt a target system's networking (packet loss) by setting an invalid MTU value, for example, via a NetworkManager daemon that is processing router advertisement packets running on the target system. (CVE-2015-8215, Moderate)

* A NULL pointer dereference flaw was found in the way the Linux kernel's network subsystem handled socket creation with an invalid protocol identifier. A local user could use this flaw to crash the system. (CVE-2015-8543, Moderate)

* It was found that the espfix functionality does not work for 32-bit KVM paravirtualized guests. A local, unprivileged guest user could potentially use this flaw to leak kernel stack addresses.
(CVE-2014-8134, Low)

* A flaw was found in the way the Linux kernel's ext4 file system driver handled non-journal file systems with an orphan list. An attacker with physical access to the system could use this flaw to crash the system or, although unlikely, escalate their privileges on the system. (CVE-2015-7509, Low)

* A NULL pointer dereference flaw was found in the way the Linux kernel's ext4 file system driver handled certain corrupted file system images. An attacker with physical access to the system could use this flaw to crash the system. (CVE-2015-8324, Low)

Red Hat would like to thank Nadav Amit for reporting CVE-2010-5313 and CVE-2014-7842, Andy Lutomirski for reporting CVE-2014-8134, and Dmitriy Monakhov (OpenVZ) for reporting CVE-2015-8324. The CVE-2015-5156 issue was discovered by Jason Wang (Red Hat).

Additional Changes :

* Refer to Red Hat Enterprise Linux 6.8 Release Notes for information on new kernel features and known issues, and Red Hat Enterprise Linux Technical Notes for information on device driver updates, important changes to external kernel parameters, notable bug fixes, and technology previews. Both of these documents are linked to in the References section.

This update fixes the CVEs described below.

CVE-2013-7446

Dmitry Vyukov discovered that a particular sequence of valid operations on local (AF_UNIX) sockets can result in a use-after-free.
This may be used to cause a denial of service (crash) or possibly for privilege escalation.

CVE-2015-7799

&#x90ED;&#x6C38;&#x521A; discovered that a user granted access to /dev/ppp can cause a denial of service (crash) by passing invalid parameters to the PPPIOCSMAXCID ioctl. This also applies to ISDN PPP device nodes.

CVE-2015-7833

Sergej Schumilo, Hendrik Schwartke and Ralf Spenneberg discovered a flaw in the processing of certain USB device descriptors in the usbvision driver. An attacker with physical access to the system can use this flaw to crash the system.

CVE-2015-7990

It was discovered that the fix for CVE-2015-6937 was incomplete. A race condition when sending a message on unbound socket can still cause a NULL pointer dereference. A remote attacker might be able to cause a denial of service (crash) by sending a crafted packet.

CVE-2015-8324

'Valintinr' reported that an attempt to mount a corrupted ext4 filesystem may result in a kernel panic. A user permitted to mount filesystems could use this flaw to crash the system.

For the oldoldstable distribution (squeeze), these problems have been fixed in version 2.6.32-48squeeze17. We recommend that you upgrade your linux-2.6 packages.

For the oldstable (wheezy) and stable (jessie) distributions, CVE-2015-7833, CVE-2015-7990 and CVE-2015-8324 have been fixed and the other issues will be fixed soon.

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

The remote Oracle Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2016-0855 advisory.

    - [x86] kernel: espfix not working for 32-bit KVM paravirt guests (Jacob Tanenbaum) [1172767]     {CVE-2014-8134}
    - [x86] nmi/64: Fix a paravirt stack-clobbering bug in the NMI code (Denys Vlasenko) [1259581]     {CVE-2015-5157}
    - [x86] nmi/64: Switch stacks on userspace NMI entry (Denys Vlasenko) [1259581] {CVE-2015-5157}
    - [net] unix: correctly track in-flight fds in sending process user_struct (Hannes Frederic Sowa)     [1313052] {CVE-2016-2550}
    - [net] sctp: Prevent soft lockup when sctp_accept() is called during a timeout event (Jacob Tanenbaum)     [1297422] {CVE-2015-8767}
    - [virt] kvm: x86: Dont report guest userspace emulation error to userspace (Bandan Das) [1163764]     {CVE-2010-5313 CVE-2014-7842}
    - [virt] kvm: inject #UD if instruction emulation fails and exit to userspace (Bandan Das) [1163764]     {CVE-2010-5313 CVE-2014-7842}
    - [fs] pipe: fix offset and len mismatch on pipe_iov_copy_to_user failure (Seth Jennings) [1302223]     {CVE-2016-0774}

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 5 / 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2016-3567 advisory.

    - net: add validation for the socket syscall protocol argument (Hannes Frederic Sowa)  [Orabug: 23267965]     {CVE-2015-8543} {CVE-2015-8543}
    - ext4: Fix null dereference in ext4_fill_super() (Ben Hutchings)  [Orabug: 23263398]  {CVE-2015-8324}     {CVE-2015-8324}
    - ipv6: addrconf: validate new MTU before applying it (Marcelo Leitner)  [Orabug: 23263242]     {CVE-2015-8215}
    - ext4: avoid hang when mounting non-journal filesystems with orphan list (Theodore Ts'o)  [Orabug:
    23262201]  {CVE-2015-7509}
    - ext4: make orphan functions be no-op in no-journal mode (Anatol Pomozov)  [Orabug: 23262201]     {CVE-2015-7509}

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.

Security Fix(es) :

  - It was found that reporting emulation failures to user     space could lead to either a local (CVE-2014-7842) or a     L2->L1 (CVE-2010-5313) denial of service. In the case of     a local denial of service, an attacker must have access     to the MMIO area or be able to access an I/O port.
    Please note that on certain systems, HPET is mapped to     userspace as part of vdso (vvar) and thus an     unprivileged user may generate MMIO transactions (and     enter the emulator) this way. (CVE-2010-5313,     CVE-2014-7842, Moderate)

  - It was found that the Linux kernel did not properly     account file descriptors passed over the unix socket     against the process limit. A local user could use this     flaw to exhaust all available memory on the system.
    (CVE-2013-4312, Moderate)

  - 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, Moderate)

  - It was found that the Linux kernel's IPv6 network stack     did not properly validate the value of the MTU variable     when it was set. A remote attacker could potentially use     this flaw to disrupt a target system's networking     (packet loss) by setting an invalid MTU value, for     example, via a NetworkManager daemon that is processing     router advertisement packets running on the target     system. (CVE-2015-8215, Moderate)

  - A NULL pointer dereference flaw was found in the way the     Linux kernel's network subsystem handled socket creation     with an invalid protocol identifier. A local user could     use this flaw to crash the system. (CVE-2015-8543,     Moderate)

  - It was found that the espfix functionality does not work     for 32-bit KVM paravirtualized guests. A local,     unprivileged guest user could potentially use this flaw     to leak kernel stack addresses. (CVE-2014-8134, Low)

  - A flaw was found in the way the Linux kernel's ext4 file     system driver handled non-journal file systems with an     orphan list. An attacker with physical access to the     system could use this flaw to crash the system or,     although unlikely, escalate their privileges on the     system. (CVE-2015-7509, Low)

  - A NULL pointer dereference flaw was found in the way the     Linux kernel's ext4 file system driver handled certain     corrupted file system images. An attacker with physical     access to the system could use this flaw to crash the     system. (CVE-2015-8324, Low)

Notes :

  - Problems have been reported with this kernel and     VirtualBox. More info is available in the notes for the     VirtualBox ticket here: <a     href='https://www.virtualbox.org/ticket/14866'     target='_blank'>https://www.virtualbox.org/ticket/14866<     /a>

ID	Name	Product	Family	Published	Updated	Severity
91170	CentOS 6 : kernel (CESA-2016:0855)	Nessus	CentOS Local Security Checks	5/17/2016	1/4/2021	high
87265	Debian DLA-360-1 : linux-2.6 security update	Nessus	Debian Local Security Checks	12/9/2015	1/11/2021	medium
91210	Oracle Linux 6 : kernel (ELSA-2016-0855)	Nessus	Oracle Linux Local Security Checks	5/18/2016	10/22/2024	high
91077	RHEL 6 : kernel (RHSA-2016:0855)	Nessus	Red Hat Local Security Checks	5/12/2016	10/24/2019	high
91293	Oracle Linux 5 / 6 : Unbreakable Enterprise kernel (ELSA-2016-3567)	Nessus	Oracle Linux Local Security Checks	5/23/2016	11/1/2024	high
91643	Scientific Linux Security Update : kernel on SL6.x i386/x86_64 (20160510)	Nessus	Scientific Linux Local Security Checks	6/17/2016	1/14/2021	high

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