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Virtuozzo 6 : kernel / kernel-abi-whitelists / kernel-debug / etc (VZLSA-2017-0892)

high Nessus Plugin ID 101443

Synopsis

The remote Virtuozzo host is missing a security update.

Description

An update for kernel is now available for Red Hat Enterprise Linux 6.

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

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

Security Fix(es) :

* A race condition flaw was found in the N_HLDC Linux kernel driver when accessing n_hdlc.tbuf list that can lead to double free. A local, unprivileged user able to set the HDLC line discipline on the tty device could use this flaw to increase their privileges on the system.
(CVE-2017-2636, Important)

* A flaw was found in the Linux kernel's implementation of seq_file where a local attacker could manipulate memory in the put() function pointer. This could lead to memory corruption and possible privileged escalation. (CVE-2016-7910, Moderate)

Red Hat would like to thank Alexander Popov for reporting CVE-2017-2636.

Bug Fix(es) :

* Previously, Chelsio firmware included an incorrectly-formatted firmware bin file. As a consequence, the firmware could not be flashed. This update provides a firmware bin file that is formatted correctly. As a result, Chelsio firmware can now be flashed successfully. (BZ#1433865)

* When multiple simultaneous processes attempted to read from the /proc/stat file, spinlock overhead was generated on Non-Uniform Memory Access (NUMA) systems. Consequently, a large amount of CPU was consumed. With this update, the underlying source code has been fixed to avoid taking spinlock when the interrupt line does not exist. As a result, the spinlock overhead is now generated less often, and multiple simultaneous processes can now read /proc/stat without consuming a large amount of CPU. (BZ#1428106)

Note that Tenable Network Security has attempted to extract the preceding description block directly from the corresponding Red Hat security advisory. Virtuozzo provides no description for VZLSA advisories. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Update the affected kernel / kernel-abi-whitelists / kernel-debug / etc package.

See Also

http://www.nessus.org/u?57610098

https://access.redhat.com/errata/RHSA-2017-0892

Plugin Details

Severity: High

ID: 101443

File Name: Virtuozzo_VZLSA-2017-0892.nasl

Version: 1.9

Type: local

Published: 7/13/2017

Updated: 12/11/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 9.3

Temporal Score: 7.3

Vector: CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2016-7910

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7

Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:virtuozzo:virtuozzo:python-perf, p-cpe:/a:virtuozzo:virtuozzo:kernel-debug, p-cpe:/a:virtuozzo:virtuozzo:kernel-devel, cpe:/o:virtuozzo:virtuozzo:6, p-cpe:/a:virtuozzo:virtuozzo:kernel-doc, p-cpe:/a:virtuozzo:virtuozzo:kernel-headers, p-cpe:/a:virtuozzo:virtuozzo:kernel-abi-whitelists, p-cpe:/a:virtuozzo:virtuozzo:kernel, p-cpe:/a:virtuozzo:virtuozzo:kernel-firmware, p-cpe:/a:virtuozzo:virtuozzo:kernel-debug-devel, p-cpe:/a:virtuozzo:virtuozzo:perf

Required KB Items: Host/local_checks_enabled, Host/Virtuozzo/release, Host/Virtuozzo/rpm-list

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 4/12/2017

Reference Information

CVE: CVE-2016-7910, CVE-2017-2636