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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.

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Please Note:
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Secunia NEVER sends attached files with advisories.
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use those supplied by the vendor.

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