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TITLE:
Linux Kernel s390 "copy_from_user" Information Disclosure

SECUNIA ADVISORY ID:
SA22289

VERIFY ADVISORY:
http://secunia.com/advisories/22289/

CRITICAL:
Less critical

IMPACT:
Exposure of sensitive information

WHERE:
Local system

OPERATING SYSTEM:
Linux Kernel 2.6.x
http://secunia.com/product/2719/

DESCRIPTION:
A vulnerability has been reported in the Linux Kernel, which can be
exploited by malicious, local users to gain knowledge of potentially
sensitive information.

The vulnerability is caused due to the "copy_from_user" function not
correctly clearing kernel buffers after receiving a fault because of
invalid user space addresses. This can be exploited to read
uninitialised kernel memory by appending to files from invalid
addresses.

Note: The vulnerability affects the s390 architecture only.

SOLUTION:
The vulnerability has been fixed in version 2.6.19-rc1.

PROVIDED AND/OR DISCOVERED BY:
Reported by the vendor.

CHANGELOG:
http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=52149ba6b0ddf3e9d965257cc0513193650b3ea8
http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.19-rc1

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About:
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