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Test ID:
Category:Red Hat Local Security Checks
Title:RedHat Update for kernel RHSA-2015:1623-01
Summary:The remote host is missing an update for the 'kernel'; package(s) announced via the referenced advisory.
The remote host is missing an update for the 'kernel'
package(s) announced via the referenced advisory.

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

Two flaws were found in the way the Linux kernel's networking
implementation handled UDP packets with incorrect checksum values. A remote
attacker could potentially use these flaws to trigger an infinite loop in
the kernel, resulting in a denial of service on the system, or cause a
denial of service in applications using the edge triggered epoll
functionality. (CVE-2015-5364, CVE-2015-5366, Important)

This update also fixes the following bugs:

* When removing a directory, and a reference was held to that directory by
a reference to a negative child dentry, the directory dentry was previously
not killed. In addition, once the negative child dentry was killed, an
unlinked and unused dentry was present in the cache. As a consequence,
deadlock could be caused by forcing the dentry eviction while the file
system in question was frozen. With this update, all unused dentries are
unhashed and evicted just after a successful directory removal, which
avoids the deadlock, and the system no longer hangs in the aforementioned
scenario. (BZ#1243400)

* Due to the broken s_umount lock ordering, a race condition occurred when
an unlinked file was closed and the sync (or syncfs) utility was run at the
same time. As a consequence, deadlock occurred on a frozen file system
between sync and a process trying to unfreeze the file system. With this
update, sync (or syncfs) is skipped on a frozen file system, and deadlock
no longer occurs in the aforementioned situation. (BZ#1243404)

* Previously, in the scenario when a file was opened by file handle
(fhandle) with its dentry not present in dcache ('cold dcache') and then
making use of the unlink() and close() functions, the inode was not freed
upon the close() system call. As a consequence, the iput() final was
delayed indefinitely. A patch has been provided to fix this bug, and the
inode is now freed as expected. (BZ#1243406)

* Due to a corrupted Executable and Linkable Format (ELF) header in the
/proc/vmcore file, the kdump utility failed to provide any information.
The underlying source code has been patched, and kdump now provides
debugging information for kernel crashes as intended. (BZ#1245195)

* Previously, running the multipath request queue caused regressions in
cases where paths failed regularly under I/O load. This regression
manifested as I/O stalls that exceeded 300 seconds. This update reverts the
changes aimed to reduce running the multipath request queue resulting in
I/O stalls completing ...

Description truncated, please see the referenced URL(s) for more information.

Affected Software/OS:
kernel on Red Hat Enterprise Linux Server (v. 6),
Red Hat Enterprise Linux Workstation (v. 6)

Please Install the Updated Packages.

CVSS Score:

CVSS Vector:

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2015-5364
BugTraq ID: 75510
Debian Security Information: DSA-3313 (Google Search)
Debian Security Information: DSA-3329 (Google Search)
RedHat Security Advisories: RHSA-2015:1623
RedHat Security Advisories: RHSA-2015:1778
RedHat Security Advisories: RHSA-2015:1787
RedHat Security Advisories: RHSA-2016:0045
RedHat Security Advisories: RHSA-2016:1096
RedHat Security Advisories: RHSA-2016:1100
RedHat Security Advisories: RHSA-2016:1225
SuSE Security Announcement: SUSE-SU-2015:1224 (Google Search)
SuSE Security Announcement: SUSE-SU-2015:1324 (Google Search)
SuSE Security Announcement: SUSE-SU-2015:1478 (Google Search)
SuSE Security Announcement: SUSE-SU-2015:1487 (Google Search)
SuSE Security Announcement: SUSE-SU-2015:1488 (Google Search)
SuSE Security Announcement: SUSE-SU-2015:1489 (Google Search)
SuSE Security Announcement: SUSE-SU-2015:1490 (Google Search)
SuSE Security Announcement: SUSE-SU-2015:1491 (Google Search)
SuSE Security Announcement: SUSE-SU-2015:1592 (Google Search)
SuSE Security Announcement: SUSE-SU-2015:1611 (Google Search)
SuSE Security Announcement: openSUSE-SU-2015:1382 (Google Search)
Common Vulnerability Exposure (CVE) ID: CVE-2015-5366
CopyrightCopyright (C) 2016 Greenbone Networks GmbH

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