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CVE-2016-3672

Published: 27 April 2016

The arch_pick_mmap_layout function in arch/x86/mm/mmap.c in the Linux kernel through 4.5.2 does not properly randomize the legacy base address, which makes it easier for local users to defeat the intended restrictions on the ADDR_NO_RANDOMIZE flag, and bypass the ASLR protection mechanism for a setuid or setgid program, by disabling stack-consumption resource limits.

From the Ubuntu security team

Hector Marco and Ismael Ripoll discovered that the Linux kernel would improperly disable Address Space Layout Randomization (ASLR) for x86 processes running in 32 bit mode if stack-consumption resource limits were disabled. A local attacker could use this to make it easier to exploit an existing vulnerability in a setuid/setgid program.

Priority

Low

CVSS 3 base score: 7.8

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
Patches:
Introduced by 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Fixed by 8b8addf891de8a00e4d39fc32f93f7c5eb8feceb
linux-armadaxp
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
This package is not directly supported by the Ubuntu Security Team
linux-aws
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-flo
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-gke
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-goldfish
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-grouper
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-hwe
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-hwe-edge
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-linaro-omap
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-linaro-shared
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-linaro-vexpress
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-lts-quantal
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
This package is not directly supported by the Ubuntu Security Team
linux-lts-raring
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-lts-saucy
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
This package is not directly supported by the Ubuntu Security Team
linux-lts-trusty
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-lts-utopic
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-lts-vivid
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-lts-wily
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-lts-xenial
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-maguro
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-mako
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-manta
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-qcm-msm
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-raspi2
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-snapdragon
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)
linux-ti-omap4
Launchpad, Ubuntu, Debian
Upstream
Released (4.6~rc1)