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CVE-2016-6828

Published: 18 August 2016

The tcp_check_send_head function in include/net/tcp.h in the Linux kernel before 4.7.5 does not properly maintain certain SACK state after a failed data copy, which allows local users to cause a denial of service (tcp_xmit_retransmit_queue use-after-free and system crash) via a crafted SACK option.

From the Ubuntu security team

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.

Priority

Medium

CVSS 3 base score: 5.5

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
Upstream
Released (4.8~rc5)
Patches:
Introduced by 6859d49475d4f32abe640372117e4b687906e6b6
Fixed by bb1fceca22492109be12640d49f5ea5a544c6bb4
linux-armadaxp
Launchpad, Ubuntu, Debian
Upstream
Released (4.8~rc5)
This package is not directly supported by the Ubuntu Security Team
linux-aws
Launchpad, Ubuntu, Debian
Upstream
Released (4.8~rc5)
linux-flo
Launchpad, Ubuntu, Debian
Upstream
Released (4.8~rc5)
linux-gke
Launchpad, Ubuntu, Debian
Upstream
Released (4.8~rc5)
linux-goldfish
Launchpad, Ubuntu, Debian
Upstream
Released (4.8~rc5)
linux-grouper
Launchpad, Ubuntu, Debian
Upstream
Released (4.8~rc5)
linux-hwe
Launchpad, Ubuntu, Debian
Upstream
Released (4.8~rc5)
linux-hwe-edge
Launchpad, Ubuntu, Debian
Upstream
Released (4.8~rc5)
linux-linaro-omap
Launchpad, Ubuntu, Debian
Upstream
Released (4.8~rc5)
linux-linaro-shared
Launchpad, Ubuntu, Debian
Upstream
Released (4.8~rc5)
linux-linaro-vexpress
Launchpad, Ubuntu, Debian
Upstream
Released (4.8~rc5)
linux-lts-quantal
Launchpad, Ubuntu, Debian
Upstream
Released (4.8~rc5)
This package is not directly supported by the Ubuntu Security Team
linux-lts-raring
Launchpad, Ubuntu, Debian
Upstream
Released (4.8~rc5)
linux-lts-saucy
Launchpad, Ubuntu, Debian
Upstream
Released (4.8~rc5)
This package is not directly supported by the Ubuntu Security Team
linux-lts-trusty
Launchpad, Ubuntu, Debian
Upstream
Released (4.8~rc5)
linux-lts-utopic
Launchpad, Ubuntu, Debian
Upstream
Released (4.8~rc5)
linux-lts-vivid
Launchpad, Ubuntu, Debian
Upstream
Released (4.8~rc5)
linux-lts-wily
Launchpad, Ubuntu, Debian
Upstream
Released (4.8~rc5)
linux-lts-xenial
Launchpad, Ubuntu, Debian
Upstream
Released (4.8~rc5)
linux-maguro
Launchpad, Ubuntu, Debian
Upstream
Released (4.8~rc5)
linux-mako
Launchpad, Ubuntu, Debian
Upstream
Released (4.8~rc5)
linux-manta
Launchpad, Ubuntu, Debian
Upstream
Released (4.8~rc5)
linux-qcm-msm
Launchpad, Ubuntu, Debian
Upstream
Released (4.8~rc5)
linux-raspi2
Launchpad, Ubuntu, Debian
Upstream
Released (4.8~rc5)
linux-snapdragon
Launchpad, Ubuntu, Debian
Upstream
Released (4.8~rc5)
linux-ti-omap4
Launchpad, Ubuntu, Debian
Upstream
Released (4.8~rc5)