CVE-2009-4141

Severity: high (CVSS 7.2 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2010-01-19 · updated 2026-06-16
Weakness: CWE-399

Description

Use-after-free vulnerability in the fasync_helper function in fs/fcntl.c in the Linux kernel before 2.6.33-rc4-git1 allows local users to gain privileges via vectors that include enabling O_ASYNC (aka FASYNC or FIOASYNC) on a locked file, and then closing this file.

Affected products

Linux kernel: through 2.6.33; 2.6.0, 2.6.1, 2.6.2, 2.6.3, 2.6.4, 2.6.5 (+132)

References

http://archives.neohapsis.com/archives/fulldisclosure/2010-01/0252.html
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=53281b6d34d44308372d16acb7fb5327609f68b6
http://lists.opensuse.org/opensuse-security-announce/2010-02/msg00002.html
http://lock.cmpxchg8b.com/5ebe2294ecd0e0f08eab7690d2a6ee69/create_elf_tables.c
http://secunia.com/advisories/38199
http://secunia.com/advisories/39033
http://support.avaya.com/css/P8/documents/100073666
http://twitter.com/taviso/statuses/7744108017
http://www.kernel.org/pub/linux/kernel/v2.6/snapshots/patch-2.6.33-rc4-git1.bz2
http://www.redhat.com/support/errata/RHSA-2010-0161.html
http://www.securityfocus.com/bid/37806
https://bugzilla.redhat.com/show_bug.cgi?id=547906

Get alerted when CVE-2009-4141 or the next vulnerability affects your stack