A security issue and a vulnerability have been reported in the Linux Kernel, which can be exploited by malicious, local users and malicious people to cause a DoS (Denial of Service).

1) The security issue is caused due to an error within the handling of certain VFAT IOCTLs on 64bit systems, which can be exploited to crash the kernel by calling certain IOCTLs with malicious parameters.

Successful exploitation requires a 64bit-system and vfat and msdos file systems.

2) The vulnerability is caused due to a NULL pointer dereference within the hop-by-hop handlers when processing IPv6 "Jumbograms". This can be exploited to cause a DoS by sending specially crafted IPv6 packets to a vulnerable system.

Solution
Update to version 2.6.21.2.

Provided and/or discovered by
1) Bart Oldeman
2) Eric Sesterhenn and Victor Julien

Changelog
Further details available in Customer Area

Original Advisory
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.21.2
http://bugzilla.kernel.org/show_bug.cgi?id=8450

Deep Links
Links available in Customer Area