Multiple off-by-one errors in the ext4 subsystem in the Linux kernel before 3.0-rc5 allow local users to cause a denial of service (BUG_ON and system crash) by accessing a sparse file in extent format with a write operation involving a block number corresponding to the largest possible 32-bit unsigned integer.

References

• https://nvd.nist.gov/vuln/detail/CVE-2011-2695
• https://bugzilla.redhat.com/show_bug.cgi?id=722557
• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=f17722f917b2f21497deb6edc62fb1683daa08e6
• http://secunia.com/advisories/45193
• http://www.kernel.org/pub/linux/kernel/v3.0/testing/ChangeLog-3.0-rc5
• http://www.openwall.com/lists/oss-security/2011/07/15/7
• http://www.openwall.com/lists/oss-security/2011/07/15/8
• http://www.spinics.net/lists/linux-ext4/msg25697.html
• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=f17722f917b2f21497deb6edc62fb1683daa08e6