Some vulnerabilities have been reported in the Linux Kernel, which can be exploited by malicious, local users to cause a DoS (Denial of Service), disclose potentially sensitive information, or to potentially gain escalated privileges.

1) An integer overflow error exists within the "get_fdb_entries()" function in net/bridge/br_ioctl.c. This can be exploited to cause a buffer overflow via specially crafted ioctl() requests.

Successful exploitation may allow the execution of arbitrary code with escalated privileges.

2) An error while copying memory from userspace on AMD64 platforms can be exploited to disclose potentially sensitive information.

3) An error in the "generic_file_splice_write()" function can be exploited to potentially gain escalated user or group privileges.

4) An error within the "udp_sendmsg()" function in net/ipv4/udp.c and the "udpv6_sendmsg()" function in net/ipv6/udp.c can be exploited to e.g. cause a crash.

5) A use-after-free error within the "xacct_add_tsk()" function in tsacct.c can be exploited to dereference already freed memory.

Solution
Update to version 2.6.19.

Provided and/or discovered by
1) Eugene Teo with further research by a1rsupp1y.
2) Andi Kleen and disclosed as a vulnerability via a Red Hat bug report.
3) Mark Fasheh and reported as a vulnerability by Eugene Teo.
4) cagri coltekin.
5) Oleg Nesterov and reported as a vulnerability by Alexander Peslyak.

Changelog
Further details available to Secunia VIM customers

Original Advisory
1) http://projects.info-pull.com/mokb/MOKB-29-11-2006.html
http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.18.4
2) https://bugzilla.redhat.com/show_bug.cgi?id=451271
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=3022d734a54cbd2b65eea9a024564821101b4a9a
3) https://bugzilla.redhat.com/show_bug.cgi?id=464450
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=8c34e2d63231d4bf4852bac8521883944d770fe3
4) http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=1e0c14f49d6b393179f423abbac47f85618d3d46
5) https://bugzilla.redhat.com/show_bug.cgi?id=849722
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=f0ec1aaf54caddd21c259aea8b2ecfbde4ee4fb9

Deep Links
Links available to Secunia VIM customers