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TITLE:
Linux Kernel Keyring Management Denial of Service Vulnerabilities

SECUNIA ADVISORY ID:
SA16355

VERIFY ADVISORY:
http://secunia.com/advisories/16355/

CRITICAL:
Not critical

IMPACT:
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).

1) An error within the handling of keyrings makes it possible to
crash the kernel when destroying a keyring that wasn't properly
instantiated. This can be exploited by attempting to add a keyring
that doesn't have an empty payload.

2) An error within the error handling path for the
"KEYCTL_JOIN_SESSION_KEYRING" operation when attempting to join a key
management session may cause the session management semaphore to not
be released. This can be exploited by attempting to add a new session
keyring.

SOLUTION:
The vulnerabilities have been fixed in version 2.6.13-rc6.

PROVIDED AND/OR DISCOVERED BY:
David Howells

ORIGINAL ADVISORY:
Kernel.org:
http://kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.13-rc6

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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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