Description

The __switch_to function in arch/x86/kernel/process_64.c in the Linux kernel through 3.18.1 does not ensure that Thread Local Storage (TLS) descriptors are loaded before proceeding with other steps, which makes it easier for local users to bypass the ASLR protection mechanism via a crafted application that reads a TLS base address.

References

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=f647d7c155f069c1a068030255c300663516420e

http://lists.fedoraproject.org/pipermail/package-announce/2015-January/147864.html

http://lists.fedoraproject.org/pipermail/package-announce/2015-January/147973.html

http://lists.opensuse.org/opensuse-security-announce/2015-03/msg00020.html

http://lists.opensuse.org/opensuse-security-announce/2015-04/msg00009.html

http://lists.opensuse.org/opensuse-security-announce/2015-04/msg00015.html

http://rhn.redhat.com/errata/RHSA-2015-1081.html

http://www.debian.org/security/2015/dsa-3128

http://www.mandriva.com/security/advisories?name=MDVSA-2015:058

http://www.openwall.com/lists/oss-security/2014/12/25/1

http://www.securityfocus.com/bid/71794

http://www.ubuntu.com/usn/USN-2515-1

http://www.ubuntu.com/usn/USN-2516-1

http://www.ubuntu.com/usn/USN-2517-1

http://www.ubuntu.com/usn/USN-2518-1

http://www.ubuntu.com/usn/USN-2541-1

http://www.ubuntu.com/usn/USN-2542-1

https://bugzilla.redhat.com/show_bug.cgi?id=1177260

https://github.com/torvalds/linux/commit/f647d7c155f069c1a068030255c300663516420e

Details

Risk Information

CVSS v2