Privilege escalation in Linux kernel

Published: 2016-10-19 00:00:00 | Updated: 2017-02-13 14:10:40
Severity Medium
Patch available YES
Number of vulnerabilities 1
CVSSv2 6 (AV:L/AC:L/Au:N/C:C/I:C/A:C/E:F/RL:OF/RC:C)
CVSSv3 7.1 [CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C]
CVE ID CVE-2016-5195
CWE ID CWE-362
Exploitation vector Local
Public exploit This vulnerability is being exploited in the wild.
Vulnerable software Linux kernel
Vulnerable software versions Linux kernel 2.6.9
Linux kernel 2.6.8.1
Linux kernel 2.6.8
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Vendor URL Linux Foundation
Advisory type Public

Security Advisory

1) Privilege escalation

Description

The vulnerability allows a  local user to obtain elevated privileges on the target system.
The weakness is due to race condition in the kernel memory subsystem in the management of copy-on-write operations on read-only memory mappings that lets attackers to overwrite kernel memory and gain kernel-level privileges.
Successful exploitation of the vulnerability results in gaining of root privileges on the vulnerable system.

Note: the vulnerability was being actively exploited.

Remediation

Update to version 4.9-rc2.
https://cdn.kernel.org/pub/linux/kernel/v4.x/testing/linux-4.9-rc2.tar.xz

External links

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=19be0eaffa3ac7d8eb6784ad9...


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