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CVE-2015-7550

Published: 30 December 2015

The keyctl_read_key function in security/keys/keyctl.c in the Linux kernel before 4.3.4 does not properly use a semaphore, which allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact via a crafted application that leverages a race condition between keyctl_revoke and keyctl_read calls.

From the Ubuntu security team

It was discovered that the Linux kernel keyring subsystem contained a race between read and revoke operations. A local attacker could use this to cause a denial of service (system crash).

Priority

Medium

CVSS 3 base score: 5.5

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
Upstream
Released (4.4~rc8)
Patches:
Introduced by 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Fixed by b4a1b4f5047e4f54e194681125c74c0aa64d637d
linux-armadaxp
Launchpad, Ubuntu, Debian
Upstream
Released (4.4~rc8)
This package is not directly supported by the Ubuntu Security Team
linux-aws
Launchpad, Ubuntu, Debian
Upstream
Released (4.4~rc8)
linux-flo
Launchpad, Ubuntu, Debian
Upstream
Released (4.4~rc8)
linux-fsl-imx51
Launchpad, Ubuntu, Debian
Upstream
Released (4.4~rc8)
linux-gke
Launchpad, Ubuntu, Debian
Upstream
Released (4.4~rc8)
linux-goldfish
Launchpad, Ubuntu, Debian
Upstream
Released (4.4~rc8)
linux-grouper
Launchpad, Ubuntu, Debian
Upstream
Released (4.4~rc8)
linux-hwe
Launchpad, Ubuntu, Debian
Upstream
Released (4.4~rc8)
linux-hwe-edge
Launchpad, Ubuntu, Debian
Upstream
Released (4.4~rc8)
linux-linaro-omap
Launchpad, Ubuntu, Debian
Upstream
Released (4.4~rc8)
linux-linaro-shared
Launchpad, Ubuntu, Debian
Upstream
Released (4.4~rc8)
linux-linaro-vexpress
Launchpad, Ubuntu, Debian
Upstream
Released (4.4~rc8)
linux-lts-quantal
Launchpad, Ubuntu, Debian
Upstream
Released (4.4~rc8)
This package is not directly supported by the Ubuntu Security Team
linux-lts-raring
Launchpad, Ubuntu, Debian
Upstream
Released (4.4~rc8)
linux-lts-saucy
Launchpad, Ubuntu, Debian
Upstream
Released (4.4~rc8)
This package is not directly supported by the Ubuntu Security Team
linux-lts-trusty
Launchpad, Ubuntu, Debian
Upstream
Released (4.4~rc8)
linux-lts-utopic
Launchpad, Ubuntu, Debian
Upstream
Released (4.4~rc8)
linux-lts-vivid
Launchpad, Ubuntu, Debian
Upstream
Released (4.4~rc8)
linux-lts-wily
Launchpad, Ubuntu, Debian
Upstream
Released (4.4~rc8)
linux-lts-xenial
Launchpad, Ubuntu, Debian
Upstream
Released (4.4~rc8)
linux-maguro
Launchpad, Ubuntu, Debian
Upstream
Released (4.4~rc8)
linux-mako
Launchpad, Ubuntu, Debian
Upstream
Released (4.4~rc8)
linux-manta
Launchpad, Ubuntu, Debian
Upstream
Released (4.4~rc8)
linux-qcm-msm
Launchpad, Ubuntu, Debian
Upstream
Released (4.4~rc8)
linux-raspi2
Launchpad, Ubuntu, Debian
Upstream
Released (4.4~rc8)
linux-snapdragon
Launchpad, Ubuntu, Debian
Upstream
Released (4.4~rc8)
linux-ti-omap4
Launchpad, Ubuntu, Debian
Upstream
Released (4.4~rc8)