CVE-2009-4141: Linux Kernel

High severity, CVSS 7.2. EPSS: 1% chance of exploitation in the next 30 days.

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 Linux Kernel: up to and including 2.6.33; version 2.6.0 only; version 2.6.1 only; version 2.6.2 only; version 2.6.3 only; version 2.6.4 only; …

Published 2010-01-19. Last modified 2026-06-16.