CVE-2009-4141
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…
- 7.2HighCVSS base score
- 0.97%Exploitation in 30 daysEPSS · top 38% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- 1Public exploitsMetasploit, Nuclei and Exploit-DB
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.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. The public collections list an Exploit-DB entry for it.
Show the exploits1
Exploit-DB1 entry
- Linux Kernel < 2.6.28 - 'fasync_helper()' Local Privilege Escalation (Exploit-DB entry) (opens in a new tab)
EDB-ID 33523local, linuxpublished 16 Dec 2009Verified
Modules, templates and exploits as listed by the Metasploit Framework (BSD-3-Clause), ProjectDiscovery's Nuclei templates (MIT) and the Exploit Database (GPLv2), read once a day. Where the data comes from
Timeline
ID reserved
By redhat
- 49 days later
· 49 days later
Published
- 15 years later
· 15 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 2.0 | High7.2 | AV:L/AC:L/Au:N/C:C/I:C/A:C |
- EPSS (exploitation in 30 days)
- 0.97% · top 38% of all CVEs (10 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.2.
Affected products
n/a
- affected n/a
References
16
- http://www.kernel.org/pub/linux/kernel/v2.6/snapshots/patch-2.6.33-rc4-git1.bz2 (opens in a new tab)x_refsource_CONFIRMx_transferred
- oval:org.mitre.oval:def:9201 (opens in a new tab)vdb-entrysignaturex_refsource_OVALx_transferred
- 37806 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- http://twitter.com/taviso/statuses/7744108017 (opens in a new tab)x_refsource_MISCx_transferred
- http://support.avaya.com/css/P8/documents/100073666 (opens in a new tab)x_refsource_CONFIRMx_transferred
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=53281b6d34d44308372d16acb7fb5327609f68b6 (opens in a new tab)x_refsource_CONFIRMx_transferred
- 20100114 Locked fasync file descriptors can be referenced after free in >= 2.6.28 (opens in a new tab)mailing-listx_refsource_FULLDISCx_transferred
- oval:org.mitre.oval:def:7054 (opens in a new tab)vdb-entrysignaturex_refsource_OVALx_transferred
- https://bugzilla.redhat.com/show_bug.cgi?id=547906 (opens in a new tab)x_refsource_CONFIRMx_transferred
- 39033 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- http://lock.cmpxchg8b.com/5ebe2294ecd0e0f08eab7690d2a6ee69/create_elf_tables.c (opens in a new tab)x_refsource_MISCx_transferred
- 38199 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- RHSA-2010:0095 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2010:0046 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- SUSE-SA:2010:010 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- RHSA-2010:0161 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2009-4111 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2009-4141)Record last updated .