Some vulnerabilities have been reported in the Linux Kernel, which potentially can be exploited by malicious, local users to cause a DoS (Denial of Service), gain knowledge of potentially sensitive information, bypass certain security restrictions, and with unknown impact.

1) An error in "mm/mempolicy.c" when handling the policy system call may cause the referencing of undefined nodes. This can potentially be exploited by local users to cause kernel panic via a "set_mempolicy()" call with a 0 bitmask.

2) An error in "net/ipv4/fib_frontend.c" when validating the header and payload of fib_lookup netlink messages may result in illegal memory references via malformed netlink messages.

3) An off-by-one error in "kernel/sysctl.c" may cause the user supplied buffer to be overflowed with a single NULL byte when the output string is too large to fit in the buffer.

4) A boundary error in the CA-driver for TwinHan DST Frontend/Card, "drivers/media/dvb/bt8xx/dst_ca.c", may cause a buffer overflow when more than 8 bytes are read into an 8 byte long array.

5) Missing validation of the supplied file offset value in the procfs code can be exploited by local users to read kernel memory, which may contain sensitive information.

6) A validation error in "/fs/nfsd/nfs2acl.c" may be exploited by malicious users to set ACLs on NFS filesystems even when the filesystems are exported read-only.

The vulnerabilities have been reported in the 2.6 kernel branch.

Solution
Update to version 2.6.15.

Provided and/or discovered by
1) Doug Chapman
3) Yi Yang
4) Perceval Anichini
5) Karl Janmar
6) Martin Walter

Changelog
Further details available to Secunia VIM customers

Original Advisory
Kernel.org:
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.15
http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=8f493d797bc1fe470377adc9d8775845427e240e
http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=ea86575eaf99a9262a969309d934318028dbfacb
http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=8febdd85adaa41fa1fc1cb31286210fc2cd3ed0c
http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=5c15c0b4fa850543b8ccfcf93686d24456cc384d
http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=8b90db0df7187a01fb7177f1f812123138f562cf
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.14.5
http://www.kernel.org/git/?p=linux/kernel/git/gregkh/linux-2.6.14.y.git;a=commit;h=0a63dca5ae2f975e08deae7e6c743a477af04367

Red Hat Bugzilla:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=175683

Deep Links
Links available to Secunia VIM customers