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Insecure Library Loading
Not critical

Linux Kernel Denial of Service Vulnerabilities

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Release Date:  2011-04-20    Last Update:  2011-05-09    Views:  2,963

Secunia Advisory SA44164

Where:

Local system

Impact:

DoS

Solution Status:

Vendor Patch

Operating System:

CVE Reference(s):

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 within the "next_pidmap()" function in kernel/pid.c can be exploited to cause a kernel crash by e.g. initiating a specially crafted "getdents()" system call.

2) An error within the "ubifs_fsync()" function in fs/ubifs/file.c can be exploited to cause a kernel crash by performing an "fsync()" on a file on a read-only mounted UBIFS file system.

3) An error within the "cifs_close()" function in fs/cifs/file.c can be exploited to cause a NULL pointer dereference by opening files with "O_DIRECT".


Solution:
Update to version 2.6.38.4.

Provided and/or discovered by:
1) Tavis Ormandy
2) Reuben Dowle
3) Ben Greear

Original Advisory:
http://groups.google.com/group/fa.linux.kernel/browse_thread/thread/93c1088451fd3522/4a28ecb7f755a88d?#4a28ecb7f755a88d
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=c78193e9c7bcbf25b8237ad0dec82f805c4ea69b
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=d8bdc59f215e62098bc5b4256fd9928bf27053a1
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=78530bf7f2559b317c04991b52217c1608d5a58d
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=7797069305d13252fd66cf722aa8f2cbeb3c95cd
http://comments.gmane.org/gmane.linux.kernel.cifs/2954

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Linux Kernel Denial of Service Vulnerabilities

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