Secunia

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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