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TITLE:
Linux Kernel Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA31048

VERIFY ADVISORY:
http://secunia.com/advisories/31048/

CRITICAL:
Less critical

IMPACT:
Privilege escalation, 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
can be exploited by malicious, local users to cause a DoS (Denial of
Service) or to potentially gain escalated privileges.

1) Multiple NULL-pointer dereference errors exist within the tty
handling in drivers/net/hamradio/6pack.c,
drivers/net/hamradio/mkiss.c, drivers/net/irda/irtty-sir.c,
drivers/net/ppp_async.c, drivers/net/ppp_synctty.c,
drivers/net/slip.c, drivers/net/wan/x25_asy.c, and
drivers/net/wireless/strip.c. These can be exploited to crash the
kernel or potentially execute arbitrary code with escalated
privileges.   

2) An error within the "sys32_ptrace()" function in
arch/x86/kernel/ptrace.c can be exploited to overflow the "refcount"
field of the "task_struct" structure and trigger multiple
use-after-free errors.

Successful exploitation of the vulnerability requires that the kernel
is running on an x86-64 platform.

The vulnerabilities are reported in versions prior to 2.6.25.10.

SOLUTION:
Update to version 2.6.25.10.

PROVIDED AND/OR DISCOVERED BY:
Reported as vulnerabilities by the PaX team.

ORIGINAL ADVISORY:
http://lwn.net/Articles/288473/

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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