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Test ID:
Category:Red Hat Local Security Checks
Title:RedHat Update for kernel RHSA-2017:1723-01
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.

Security Fix(es):

* The NFSv2 and NFSv3 server implementations in the Linux kernel through
4.10.13 lacked certain checks for the end of a buffer. A remote attacker
could trigger a pointer-arithmetic error or possibly cause other
unspecified impacts using crafted requests related to fs/nfsd/nfs3xdr.c and
fs/nfsd/nfsxdr.c. (CVE-2017-7895, Important)

Red Hat would like to thank Ari Kauppi for reporting this issue.

Bug Fix(es):

* If several file operations were started after a mounted NFS share had got
idle and its Transmission Control Protocol (TCP) connection had therefore
been terminated, these operations could cause multiple TCP SYN packets
coming from the NFS client instead of one. With this update, the
reconnection logic has been fixed, and only one TCP SYN packet is now sent
in the described situation. (BZ#1450850)

* When the ixgbe driver was loaded for a backplane-connected network card,
a kernel panic could occur, because the ops.setup_fc function pointer was
used before the initialization. With this update, ops.setup_fc is
initialized earlier. As a result, ixgbe no longer panics on load.

* When setting an Access Control List (ACL) with 190 and more Access
Control Entries (ACEs) on a NFSv4 directory, a kernel crash could
previously occur. This update fixes the nfs4_getfacl() function, and the
kernel no longer crashes under the described circumstances. (BZ#1449096)

* When upgrading to kernel with the fix for stack guard flaw, a crash could
occur in Java Virtual Machine (JVM) environments, which attempted to
implement their own stack guard page. With this update, the underlying
source code has been fixed to consider the PROT_NONE mapping as a part of
the stack, and the crash in JVM no longer occurs under the described
circumstances. (BZ#1466667)

* When a program receives IPv6 packets using the raw socket, the
ioctl(FIONREAD) and ioctl(SIOCINQ) functions can incorrectly return zero
waiting bytes. This update fixes the ip6_input_finish() function to check
the raw payload size properly. As a result, the ioctl() function now
returns bytes waiting in the raw socket correctly. (BZ#1450870)

* Previously, listing a directory on a non-standard XFS filesystem (with
non-default multi-fsb directory blocks) could lead to a soft lock up due to
array index overrun in the xfs_dir2_leaf_readbuf() function. This update
fixes xfs_dir2_leaf_readbuf(), and the soft lock up no longer occurs ...

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

Affected Software/OS:
kernel on
Red Hat Enterprise Linux Desktop (v. 6),
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-2017-7895
BugTraq ID: 98085
Debian Security Information: DSA-3886 (Google Search)
RedHat Security Advisories: RHSA-2017:1615
RedHat Security Advisories: RHSA-2017:1616
RedHat Security Advisories: RHSA-2017:1647
RedHat Security Advisories: RHSA-2017:1715
RedHat Security Advisories: RHSA-2017:1723
RedHat Security Advisories: RHSA-2017:1766
RedHat Security Advisories: RHSA-2017:1798
RedHat Security Advisories: RHSA-2017:2412
RedHat Security Advisories: RHSA-2017:2428
RedHat Security Advisories: RHSA-2017:2429
RedHat Security Advisories: RHSA-2017:2472
RedHat Security Advisories: RHSA-2017:2732
CopyrightCopyright (C) 2017 Greenbone Networks GmbH

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