CVE-2011-2695

Severity: medium (CVSS 4.9 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2011-07-28 · updated 2026-06-16
Weakness: CWE-193

Description

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.

Affected products

Linux kernel: before 3.0; 3.0, 3.0-rc1, 3.0-rc2, 3.0-rc3, 3.0-rc4 — fixed in 3.0

How to fix

Upgrade to a fixed version: Linux kernel 3.0. Check the vendor advisory for mitigations.

References

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=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
https://bugzilla.redhat.com/show_bug.cgi?id=722557
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=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

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