RHEL 6 : kernel (RHSA-2015:1643)

This script is Copyright (C) 2015-2017 Tenable Network Security, Inc.


Synopsis :

The remote Red Hat host is missing one or more security updates.

Description :

Updated kernel packages that fix one security issue and two bugs are
now available for Red Hat Enterprise Linux 6.4 Advanced Update
Support.

Red Hat Product Security has rated this update as having Moderate
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.

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

* It was found that the Linux kernel's ping socket implementation did
not properly handle socket unhashing during spurious disconnects,
which could lead to a use-after-free flaw. On x86-64 architecture
systems, a local user able to create ping sockets could use this flaw
to crash the system. On non-x86-64 architecture systems, a local user
able to create ping sockets could use this flaw to escalate their
privileges on the system. (CVE-2015-3636, Moderate)

This update also fixes the following bugs :

* Due to bad memory or memory corruption, an isolated
BUG_ON(mm->nr_ptes) was sometimes reported, indicating that not all
the page tables allocated could be found and freed when the
exit_mmap() function cleared the user address space. As a consequence,
a kernel panic occurred. To fix this bug, the BUG_ON() function has
been replaced by WARN_ON(), which prevents the kernel from panicking
in the aforementioned situation. (BZ#1235929)

* Previously, it was for the ext4 driver to read a metadata block and
use it without a verification. If the metadata block was corrupted, a
kernel panic could occur. With this update, verification is forced on
every buffer before it is used, which uncovers possible corruption and
prevents further use of the corrupted metadata buffer. (BZ#1242930)

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.

See also :

https://www.redhat.com/security/data/cve/CVE-2015-3636.html
http://rhn.redhat.com/errata/RHSA-2015-1643.html

Solution :

Update the affected packages.

Risk factor :

Medium / CVSS Base Score : 4.9
(CVSS2#AV:L/AC:L/Au:N/C:N/I:N/A:C)
CVSS Temporal Score : 4.3
(CVSS2#E:H/RL:OF/RC:ND)
Public Exploit Available : true

Family: Red Hat Local Security Checks

Nessus Plugin ID: 85531 ()

Bugtraq ID:

CVE ID: CVE-2015-3636

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