TITLE:
Linux Kernel Multiple Denial of Service Vulnerabilities

SECUNIA ADVISORY ID:
SA17786

VERIFY ADVISORY:
http://secunia.com/advisories/17786/

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
potentially can be exploited by malicious, local users to cause a DoS
(Denial of Service).

1) An error in the auto-reap of child processes that have ptrace
attached can lead to dangling ptrace references. This may be
exploited by local users to cause a kernel crash.

2) The use of "printk()" in the "time_out_leases()" function in
"/fs/locks.c" can consume a large amount of kernel log space. This
can be exploited by local users to cause a DoS by generating a large
number of broken leases.

The vulnerabilities have been reported in the 2.6 kernel branch.

SOLUTION:
The vulnerabilities have been fixed in version 2.6.15-rc3.

PROVIDED AND/OR DISCOVERED BY:
1) Oleg Nesterov
2) Avi Kivity

ORIGINAL ADVISORY:
Kernel.org:
http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.15-rc3
http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=7ed0175a462c4c30f6df6fac1cccac058f997739
http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=f3a9388e4ebea57583272007311fffa26ebbb305

Red Hat Bugzilla:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=174078
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=174337

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