Synopsis

Important: kernel-rt security and bug fix update

Type/Severity

Security Advisory: Important

Topic

An update for kernel-rt is now available for Red Hat Enterprise MRG 2.

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.

Description

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

Security Fix(es):

• It was found that the packet_set_ring() function of the Linux kernel's networking implementation did not properly validate certain block-size data. A local attacker with CAP_NET_RAW capability could use this flaw to trigger a buffer overflow, resulting in the crash of the system. Due to the nature of the flaw, privilege escalation cannot be fully ruled out. (CVE-2017-7308, Important)
  
• Mounting a crafted EXT4 image read-only leads to an attacker controlled memory corruption and SLAB-Out-of-Bounds reads. (CVE-2016-10208, Moderate)
  
• A flaw was found in the Linux kernel's implementation of seq_file where a local attacker could manipulate memory in the put() function pointer. This could lead to memory corruption and possible privileged escalation. (CVE-2016-7910, Moderate)
  
• A vulnerability was found in the Linux kernel. An unprivileged local user could trigger oops in shash_async_export() by attempting to force the in-kernel hashing algorithms into decrypting an empty data set. (CVE-2016-8646, Moderate)
  

Red Hat would like to thank Igor Redko (Virtuozzo kernel team) for reporting CVE-2016-8646.

Bug Fix(es):

• The kernel-rt packages have been upgraded to the 3.10.0-514 source tree, which provides a number of bug fixes over the previous version. (BZ#1440807)

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

The system must be rebooted for this update to take effect.

Affected Products

• MRG Realtime 2 x86_64

Fixes

• BZ - 1388821 - CVE-2016-8646 kernel: Oops in shash_async_export()
• BZ - 1395190 - CVE-2016-10208 kernel: EXT4 memory corruption / SLAB out-of-bounds read
• BZ - 1399727 - CVE-2016-7910 kernel: Use after free in seq file
• BZ - 1437404 - CVE-2017-7308 kernel: net/packet: overflow in check for priv area size
• BZ - 1440807 - update the MRG 2.5.z 3.10 kernel-rt sources

CVEs

• CVE-2016-10208
• CVE-2016-7910
• CVE-2016-8646
• CVE-2017-7308

References

• https://access.redhat.com/security/updates/classification/#important

MRG Realtime 2

SRPM
kernel-rt-3.10.0-514.rt56.221.el6rt.src.rpm	SHA-256: 81c7dbb9c25bce769a6efb43e3705632f5b52bb57a729e6363590402decb9db2
x86_64
kernel-rt-3.10.0-514.rt56.221.el6rt.x86_64.rpm	SHA-256: 879bd78c126e116a330e51c23a32dc97ac1e8c6644725b77eda25442ee458fd7
kernel-rt-debug-3.10.0-514.rt56.221.el6rt.x86_64.rpm	SHA-256: 6f96c492b106d88b7b9327621d870dad756db0a93052510988d144f4ff0a2c06
kernel-rt-debug-debuginfo-3.10.0-514.rt56.221.el6rt.x86_64.rpm	SHA-256: ea9ddb71ecc0871aed574e5fd35017494bfd2b146e2127675572a82fffaf8a92
kernel-rt-debug-devel-3.10.0-514.rt56.221.el6rt.x86_64.rpm	SHA-256: b0e0ba19626fa0f2470181602fd6320b6a6fc203a045d95d5e60bc095ead1cfe
kernel-rt-debuginfo-3.10.0-514.rt56.221.el6rt.x86_64.rpm	SHA-256: 790f5dfb892d9c858a141f956ff6ca1eec3b6802f100b8ab07e357f41c44e8f3
kernel-rt-debuginfo-common-x86_64-3.10.0-514.rt56.221.el6rt.x86_64.rpm	SHA-256: aca655f03c26b6ff01f619cdef5c1290228b116cabd2262b084d735def27a18e
kernel-rt-devel-3.10.0-514.rt56.221.el6rt.x86_64.rpm	SHA-256: 1fc25ffda356e13b330d24c2bfef719b7ef71a66a46b49d306de86ec493715e7
kernel-rt-doc-3.10.0-514.rt56.221.el6rt.noarch.rpm	SHA-256: 84489e5c9f2d228a5009954f27392a5b6bcb903f2802c65e9be015c03ccf9269
kernel-rt-firmware-3.10.0-514.rt56.221.el6rt.noarch.rpm	SHA-256: 0ec07af90432835fa01c7d73b322b9221df75097414c092ab68063b77a496db3
kernel-rt-trace-3.10.0-514.rt56.221.el6rt.x86_64.rpm	SHA-256: 443186f4c61e20690351c3b862de3bd6d76a815382dfddc9af16b558eac4112f
kernel-rt-trace-debuginfo-3.10.0-514.rt56.221.el6rt.x86_64.rpm	SHA-256: b22516657b9465894c0fc057e0cc021eacb9250c2c789e59d63fb7349af4dc4b
kernel-rt-trace-devel-3.10.0-514.rt56.221.el6rt.x86_64.rpm	SHA-256: a4d0662e7bcbd0b84ce2db94fa335ee3189c8d65ac291bd690c3c7f87fbd1610
kernel-rt-vanilla-3.10.0-514.rt56.221.el6rt.x86_64.rpm	SHA-256: b430829dc6fca091a9f3334f45c81848b90f02c9c8feab638191d4e8233a0f45
kernel-rt-vanilla-debuginfo-3.10.0-514.rt56.221.el6rt.x86_64.rpm	SHA-256: 9049cbb01b541e8c3b8de0303381e6759b65cef02389923e993d6ca1b035dd57
kernel-rt-vanilla-devel-3.10.0-514.rt56.221.el6rt.x86_64.rpm	SHA-256: 3f1b8ddea6eae97e3c902e75eb5c16364c2afccf2ecb046dfe0283187e3b5455