Advisories ยป MGASA-2016-0347

Updated kernel packages fixes security vulnerabilities

Publication date: 20 Oct 2016
Type: security
Affected Mageia releases : 5
CVE: CVE-2016-5195 , CVE-2016-6828 , CVE-2016-7039


This update is based on the upstream 4.4.26 kernel and fixes at least theese
security issues:

A race condition was found in the way the Linux kernel's memory subsystem
handled the copy-on-write (COW) breakage of private read-only memory
mappings. An unprivileged local user could use this flaw to gain write
access to otherwise read-only memory mappings and thus increase their
privileges on the system. This could be abused by an attacker to modify
existing setuid files with instructions to elevate privileges. An exploit
using this technique has been found in the wild (CVE-2016-5195).

Marco Grassi discovered a use-after-free condition could occur in the TCP
retransmit queue handling code in the Linux kernel. A local attacker could
use this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2016-6828)

Vladimir Bene discovered an unbounded recursion in the VLAN and TEB
Generic Receive Offload (GRO) processing implementations in the Linux
kernel, A remote attacker could use this to cause a stack corruption,
leading to a denial of service (system crash). (CVE-2016-7039)

For other fixes in this update, see the referenced changelogs.