RHSA-2015:0989 - Security Advisory

Topic

Updated kernel-rt packages that fix one security issue, several bugs, and
add various enhancements are now available for Red Hat Enterprise MRG 2.5.

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

Description

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

• A buffer overflow flaw was found in the way the Linux kernel's Intel

AES-NI instructions optimized version of the RFC4106 GCM mode decryption
functionality handled fragmented packets. A remote attacker could use this
flaw to crash, or potentially escalate their privileges on, a system over a
connection with an active AEC-GCM mode IPSec security association.
(CVE-2015-3331, Important)

This update provides a build of the kernel-rt package for Red Hat
Enterprise MRG 2.5, which is layered on Red Hat Enterprise Linux 6.
The kernel-rt sources have been updated to include fixes for the following
issues:

• Audit subsystem not resolving path name on directory watches
• audit watches do not track correctly after a rename
• auditctl output is changed in RHEL 7
• megaraid_sas: non-booting system with intel_iommu=on kernel parameter
• GFS2: kernel NULL pointer dereference in gfs2_inplace_reserve
• Crypto adapter cannot be brought online - affect all HW
• crypto/seqiv.c: wrong check of return code from crypto_rng_get_bytes
• Backport crypto: sha256_ssse3 - also test for BMI2
• Null pointer at team_handle_frame+0x62/0x100 [team]
• AES CTR x86_64 "by8" AVX optimization
• Intel RDSEED - Fix for entropy counting
• Intel SHA1 multi-buffer crypto implementation
• Intel SHA1 AVX2 optimization support
• mlx4_en: HW timestamp ends up in error queue of socket which does not

have SO_TIMESTAMPING enabled

(BZ#1213945)

All kernel-rt users are advised to upgrade to these updated packages, which
correct these issues and add these enhancements. The system must be
rebooted for this update to take effect.

Solution

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

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

Affected Products

• MRG Realtime 2 x86_64

Fixes

• BZ - 1213322 - CVE-2015-3331 Kernel: crypto: buffer overruns in RFC4106 implementation using AESNI
• BZ - 1213945 - RFE: rebase the 3.10 kernel-rt

CVEs

• CVE-2015-3331

References

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