Technical Description

Multiple vulnerabilities have been identified in Linux Kernel, which could be exploited by remote attackers or malicious users to cause a denial of service or bypass security restrictions.

The first flaw is due to a memory corruption error when syncing a malformed ReiserFS filesystem, which could be exploited by local attackers to crash a vulnerable system by mounting a malicious filesystem image, creating a denial of service condition.

The second issue is due to an error in the "nlmclnt_mark_reclaim()" [clntlock.c] function, which could be exploited by attackers to crash a vulnerable service.

The third flaw is due to errors within the "sys_get_robust_list()" and "sys_set_robust_list calls()", which could be exploited by attackers to crash a vulnerable service.

The fourth issue is due to an information leak in the "__block_prepare_write()" function, which could allow local users to read portions of unlinked files.

Other issues have been identified in the alignment check exception handling, squashfs, context switching, and smbfs mounting, which could allow malicious users to crash a vulnerable system/service or bypass security restrictions.

Affected Products

Linux Kernel versions 2.6.x

Solution

VUPEN Security is not aware of any vendor-supplied patch.

References

http://www.vupen.com/english/advisories/2006/4716
http://projects.info-pull.com/mokb/MOKB-25-11-2006.html

Credits

Vulnerability reported by LMH, Matthias Andree, Fabio Massimo Di Nitto, and Bill Allombert.

ChangeLog

2006-11-27 : Initial release
2006-12-13 : Updated Description

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