CVE-2009-4141
The MITRE CVE dictionary describes this issue as:
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.
Find out more about CVE-2009-4141 from the MITRE CVE dictionary dictionary and NIST NVD.
Statement
This issue did not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 3, 4 and Red Hat Enterprise MRG. Shipped kernels do not include upstream commit 233e70f4 that introduced the problem.
It was addressed in Red Hat Enterprise Linux 5 via https://rhn.redhat.com/errata/RHSA-2010-0046.html
CVSS v2 metrics
| Base Score | 7.2 |
|---|---|
| Base Metrics | AV:L/AC:L/Au:N/C:C/I:C/A:C |
| Access Vector | Local |
| Access Complexity | Low |
| Authentication | None |
| Confidentiality Impact | Complete |
| Integrity Impact | Complete |
| Availability Impact | Complete |
Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).
Red Hat Security Errata
| Platform | Errata | Release Date |
|---|---|---|
| Red Hat Enterprise Linux EUS (v. 5.3 server) (kernel) | RHSA-2010:0149 | 2010-03-17 |
| MRG Grid for RHEL 5 Server (kernel-rt) | RHSA-2010:0161 | 2010-03-23 |
| Red Hat Enterprise Linux 5 (kernel) | RHSA-2010:0046 | 2010-01-19 |
Acknowledgements
Red Hat would like to thank Tavis Ormandy of Google Security Team for reporting this issue.CVE description copyright © 2017, The MITRE Corporation