CVE-2015-2830 Information

Description

arch/x86/kernel/entry_64.S in the Linux kernel before 3.19.2 does not prevent the TS_COMPAT flag from reaching a user-mode task which might allow local users to bypass the seccomp or audit protection mechanism via a crafted application that uses the (1) fork or (2) close system call as demonstrated by an attack against seccomp before 3.16.

Reference

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=956421fbb74c3a6261903f3836c0740187cf038b http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00004.html http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00018.html http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00021.html http://rhn.redhat.com/errata/RHSA-2015-1137.html http://rhn.redhat.com/errata/RHSA-2015-1138.html http://rhn.redhat.com/errata/RHSA-2015-1221.html http://www.debian.org/security/2015/dsa-3237 http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.19.2 http://www.openwall.com/lists/oss-security/2015/04/02/1 http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html http://www.securitytracker.com/id/1032413 http://www.ubuntu.com/usn/USN-2631-1 http://www.ubuntu.com/usn/USN-2632-1 https://bugzilla.redhat.com/show_bug.cgi?id=1208598 https://github.com/torvalds/linux/commit/956421fbb74c3a6261903f3836c0740187cf038b