Secunia

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.

Solution
Update to version 2.6.19. Vulnerability #1 is also fixed in version 2.6.18.4.

Provided and/or discovered by
1) Reported by Eugene Teo, further research by a1rsupp1y.
2) Reported by Andi Kleen. Disclosed as a vulnerability via a Red Hat bug report.
3) Originally reported as a kernel bug by Mark Fasheh. Reported as a security issue by Eugene Teo.
4) cagri coltekin.

Changelog
Further details available in Customer Area

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

Deep Links
Links available in Customer Area