[SA18216] Linux Kernel Multiple Vulnerabilities

TITLE:
Linux Kernel Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA18216

VERIFY ADVISORY:
http://secunia.com/advisories/18216/

CRITICAL:
Less critical

IMPACT:
Unknown, DoS

WHERE:
Local system

OPERATING SYSTEM:
Linux Kernel 2.6.x
http://secunia.com/product/2719/

DESCRIPTION:
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) 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.

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

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

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

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