Secunia

Two weaknesses have been reported in the Linux Kernel, which can be exploited by malicious, local users to bypass certain security restrictions.

1) An implementation error within the "PR_SET_SECCOMP" feature can be exploited to invoke certain restricted system calls by e.g. switching a 32bit process to 64bit mode and using the "syscall" instruction or using the interrupt 80h in a 64bit process.

2) An implementation error within the "audit_syscall_entry()" function can be exploited to bypass the auditing by e.g. switching a 32bit process to 64bit mode and using the "syscall" instruction or using the interrupt 80h in a 64bit process.

Solution
Fixed in version 2.6.27.20 and 2.6.28.8.

Provided and/or discovered by
1) Chris Evans
2) Roland McGrath

Changelog
Further details available in Customer Area

Original Advisory
http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.27.20
http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.28.8

1) http://scary.beasts.org/security/CESA-2009-004.html
2) http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=ccbe495caa5e604b04d5a31d7459a6f6a76a756c

Deep Links
Links available in Customer Area