Technical Description

Multiple vulnerabilities were identified in Linux Kernel, which could be exploited by malicious users to cause a denial of service and potentially obtain elevated privileges.

The first issue is due to an error in "mm/mempolicy.c" when handling policy system calls, which could be exploited by local attackers to cause a denial of service via a "set_mempolicy" call with a 0 bitmask.

The second flaw is due to a one-byte buffer overrun error in "kernel/sysctl.c" when processing an overly long user-supplied string, which could be exploited by local attackers to potentially execute arbitrary commands.

The third vulnerability is due to an error in "net/ipv4/fib_frontend.c" when processing malformed "fib_lookup" netlink messages, which could cause illegal memory references.

The fourth issue is due to a buffer overflow error in the CA-driver for TwinHan DST Frontend/Card [drivers/media/dvb/bt8xx/dst_ca.c], which could be exploited by malicious users to cause a denial of service or potentially execute arbitrary commands.

Affected Products

Linux Kernel version 2.6.x

Solution

Upgrade to Linux Kernel version 2.6.15 :
http://www.kernel.org/

References

http://www.vupen.com/english/advisories/2006/0035
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.15

Credits

Vulnerabilities reported by Doug Chapman, Perceval Anichini and Yi Yang

ChangeLog

2006-01-04 : Initial release

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