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2003: 2,700 advisories published
2004: 3,100 advisories published
2005: 4,600 advisories published
2006: 5,300 advisories published

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TITLE:
Linux Kernel Multiple Denial of Service Vulnerabilities

SECUNIA ADVISORY ID:
SA27664

VERIFY ADVISORY:
http://secunia.com/advisories/27664/

CRITICAL:
Moderately critical

IMPACT:
DoS

WHERE:
>From remote

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 and by malicious people to
cause a DoS (Denial of Service).

1) An error within the "wait_task_stopped()" function can be
exploited to cause a DoS by manipulating the state of a child process
while the parent is waiting for the state to change (e.g. the parent
is inside "wait()" or "waitpid()").

2) An NULL-pointer dereference error exists within the 
"tcp_sacktag_write_queue()" function when processing ACK packets.
This can be exploited to crash an affected system via specially
crafted ACK packets.

The vulnerabilities are reported in versions prior to 2.6.23.8.

SOLUTION:
Update to version 2.6.23.8.

PROVIDED AND/OR DISCOVERED BY:
1) Roland McGrath
2) Ilpo Järvinen

ORIGINAL ADVISORY:
http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.23.8

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