RHSA-2015:1082 - Security Advisory

Topic

Updated kernel packages that fix two security issues are now available for
Red Hat Enterprise Linux 6.2 Advanced Update Support.

Red Hat Product Security has rated this update as having Important security
impact. Common Vulnerability Scoring System (CVSS) base scores, which give
detailed severity ratings, are available for each vulnerability from the
CVE links in the References section.

Description

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

• A use-after-free flaw was found in the way the Linux kernel's SCTP

implementation handled authentication key reference counting during INIT
collisions. A remote attacker could use this flaw to crash the system or,
potentially, escalate their privileges on the system. (CVE-2015-1421,
Important)

• It was found that the Linux kernel's implementation of vectored pipe read

and write functionality did not take into account the I/O vectors that were
already processed when retrying after a failed atomic access operation,
potentially resulting in memory corruption due to an I/O vector array
overrun. A local, unprivileged user could use this flaw to crash the system
or, potentially, escalate their privileges on the system. (CVE-2015-1805,
Important)

The CVE-2015-1421 issue was discovered by Sun Baoliang of Red Hat, and the
security impact of the CVE-2015-1805 issue was discovered by Red Hat.

All kernel users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues. 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

• Red Hat Enterprise Linux Server - AUS 6.2 x86_64

Fixes

• BZ - 1196581 - CVE-2015-1421 kernel: net: slab corruption from use after free on INIT collisions
• BZ - 1202855 - CVE-2015-1805 kernel: pipe: iovec overrun leading to memory corruption

CVEs

• CVE-2015-1421
• CVE-2015-1805

References

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