TITLE:
Linux Kernel Local Denial of Service Vulnerabilities

SECUNIA ADVISORY ID:
SA19083

VERIFY ADVISORY:
http://secunia.com/advisories/19083/

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 in the "nfs_get_user_pages()" function due to
insufficient checks on the return value returned by the
"get_user_pages()" function can be exploited to cause a local DoS by
performing an O_DIRECT write to an NFS file where the user buffer
starts with a valid mapped page, but also contains an unmapped page.

2) Missing checks for bad elf entry addresses can be exploited to
cause an endless recursive fault on Intel systems, which results in a
local DoS.

An error in the XFS "ftruncate()" function, which may expose stale
data off disk to users, has also been reported.

SOLUTION:
Update to version 2.6.15.5.
http://kernel.org/

PROVIDED AND/OR DISCOVERED BY:
Reported by vendor.

ORIGINAL ADVISORY:
http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.15.5

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