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CVE-2017-6951

Published: 16 March 2017

The keyring_search_aux function in security/keys/keyring.c in the Linux kernel through 3.14.79 allows local users to cause a denial of service (NULL pointer dereference and OOPS) via a request_key system call for the "dead" type.

From the Ubuntu security team

It was discovered that the keyring implementation in the Linux kernel did not properly restrict searches for dead keys. 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 (3.18~rc1)
Patches:
Introduced by 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Fixed by c06cfb08b88dfbe13be44a69ae2fdc3a7c902d81|c1644fe041ebaf6519f6809146a77c3ead9193af
linux-armadaxp
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
This package is not directly supported by the Ubuntu Security Team
linux-aws
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-azure
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-euclid
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-flo
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-gcp
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-gke
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-goldfish
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-grouper
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-hwe
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-hwe-edge
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-kvm
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-linaro-omap
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-linaro-shared
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-linaro-vexpress
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-lts-quantal
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
This package is not directly supported by the Ubuntu Security Team
linux-lts-raring
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-lts-saucy
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
This package is not directly supported by the Ubuntu Security Team
linux-lts-trusty
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-lts-utopic
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-lts-vivid
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-lts-wily
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-lts-xenial
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-maguro
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-mako
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-manta
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-oem
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-qcm-msm
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-raspi2
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-snapdragon
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-ti-omap4
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)

Notes

AuthorNote
sbeattie
partially fixed by c06cfb08b88dfbe13be44a69ae2fdc3a7c902d81
though see http://www.spinics.net/lists/keyrings/msg01883.html
in the Red Hat bug report, David Howells has an alternate fix
that may be more appropriate for live-patching than
c06cfb08b88dfbe13be44a69ae2fdc3a7c902d81 :
https://bugzilla.redhat.com/attachment.cgi?id=1268882

References

Bugs