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CVE-2009-4141

Use-after-free vulnerability in the fasync_helper function in fs/fcntl.c in the Linux kernel...

7.2 HighPublic exploit

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.

Exploit likelihood

0.97%Down 2.2 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 7.2

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.

Record
CVE-2009-4141
CVSS 2.0
7.2 HighAV:L/AC:L/Au:N/C:C/I:C/A:C
Weakness
CWE-399
Updated
2026-11-02
CVE List No score

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.

Record
CVE-2009-4141
Updated
2026-11-02
EUVDEUVD-2009-4111 No score

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.

Record
EUVD-2009-4111
Updated
2026-11-03
GitHub AdvisoriesGHSA-45gx-j644-hhf5 No score

Use-after-free vulnerability in the fasync_helper function in fs/fcntl.c in the Linux kernel...

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.

Record
GHSA-45gx-j644-hhf5
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
kernel
Red Hat:enterprise_linux:5::client
From an advisory covering 11 CVEs
 before 0:2.6.18-164.11.1.el5
0:2.6.18-164.11.1.el5
kernel-PAE
Red Hat:enterprise_linux:5::client
From an advisory covering 11 CVEs
 before 0:2.6.18-164.11.1.el5
0:2.6.18-164.11.1.el5
kernel-PAE-debuginfo
Red Hat:enterprise_linux:5::client
From an advisory covering 11 CVEs
 before 0:2.6.18-164.11.1.el5
0:2.6.18-164.11.1.el5
kernel-PAE-devel
Red Hat:enterprise_linux:5::client
From an advisory covering 11 CVEs
 before 0:2.6.18-164.11.1.el5
0:2.6.18-164.11.1.el5
kernel-debug
Red Hat:enterprise_linux:5::client
From an advisory covering 11 CVEs
 before 0:2.6.18-164.11.1.el5
0:2.6.18-164.11.1.el5
kernel-debug-debuginfo
Red Hat:enterprise_linux:5::client
From an advisory covering 11 CVEs
 before 0:2.6.18-164.11.1.el5
0:2.6.18-164.11.1.el5
kernel-debug-devel
Red Hat:enterprise_linux:5::client
From an advisory covering 11 CVEs
 before 0:2.6.18-164.11.1.el5
0:2.6.18-164.11.1.el5
kernel-debuginfo
Red Hat:enterprise_linux:5::client
From an advisory covering 11 CVEs
 before 0:2.6.18-164.11.1.el5
0:2.6.18-164.11.1.el5
kernel-debuginfo-common
Red Hat:enterprise_linux:5::client
From an advisory covering 11 CVEs
 before 0:2.6.18-164.11.1.el5
0:2.6.18-164.11.1.el5
kernel-devel
Red Hat:enterprise_linux:5::client
From an advisory covering 11 CVEs
 before 0:2.6.18-164.11.1.el5
0:2.6.18-164.11.1.el5
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Affected packages
PackageAffectedFixed
kernel-doc
Red Hat:enterprise_linux:5::client
From an advisory covering 11 CVEs
 before 0:2.6.18-164.11.1.el5
0:2.6.18-164.11.1.el5
kernel-xen
Red Hat:enterprise_linux:5::client
From an advisory covering 11 CVEs
 before 0:2.6.18-164.11.1.el5
0:2.6.18-164.11.1.el5
kernel-xen-debuginfo
Red Hat:enterprise_linux:5::client
From an advisory covering 11 CVEs
 before 0:2.6.18-164.11.1.el5
0:2.6.18-164.11.1.el5
kernel-xen-devel
Red Hat:enterprise_linux:5::client
From an advisory covering 11 CVEs
 before 0:2.6.18-164.11.1.el5
0:2.6.18-164.11.1.el5
kernel
Red Hat:enterprise_linux:5::server
From an advisory covering 11 CVEs
 before 0:2.6.18-164.11.1.el5
0:2.6.18-164.11.1.el5
kernel-PAE
Red Hat:enterprise_linux:5::server
From an advisory covering 11 CVEs
 before 0:2.6.18-164.11.1.el5
0:2.6.18-164.11.1.el5
kernel-PAE-debuginfo
Red Hat:enterprise_linux:5::server
From an advisory covering 11 CVEs
 before 0:2.6.18-164.11.1.el5
0:2.6.18-164.11.1.el5
kernel-PAE-devel
Red Hat:enterprise_linux:5::server
From an advisory covering 11 CVEs
 before 0:2.6.18-164.11.1.el5
0:2.6.18-164.11.1.el5
kernel-debug
Red Hat:enterprise_linux:5::server
From an advisory covering 11 CVEs
 before 0:2.6.18-164.11.1.el5
0:2.6.18-164.11.1.el5
kernel-debug-debuginfo
Red Hat:enterprise_linux:5::server
From an advisory covering 11 CVEs
 before 0:2.6.18-164.11.1.el5
0:2.6.18-164.11.1.el5
kernel-debug-devel
Red Hat:enterprise_linux:5::server
From an advisory covering 11 CVEs
 before 0:2.6.18-164.11.1.el5
0:2.6.18-164.11.1.el5
kernel-debuginfo
Red Hat:enterprise_linux:5::server
From an advisory covering 11 CVEs
 before 0:2.6.18-164.11.1.el5
0:2.6.18-164.11.1.el5
kernel-debuginfo-common
Red Hat:enterprise_linux:5::server
From an advisory covering 11 CVEs
 before 0:2.6.18-164.11.1.el5
0:2.6.18-164.11.1.el5
kernel-devel
Red Hat:enterprise_linux:5::server
From an advisory covering 11 CVEs
 before 0:2.6.18-164.11.1.el5
0:2.6.18-164.11.1.el5
kernel-doc
Red Hat:enterprise_linux:5::server
From an advisory covering 11 CVEs
 before 0:2.6.18-164.11.1.el5
0:2.6.18-164.11.1.el5
kernel-kdump
Red Hat:enterprise_linux:5::server
From an advisory covering 11 CVEs
 before 0:2.6.18-164.11.1.el5
0:2.6.18-164.11.1.el5
kernel-kdump-debuginfo
Red Hat:enterprise_linux:5::server
From an advisory covering 11 CVEs
 before 0:2.6.18-164.11.1.el5
0:2.6.18-164.11.1.el5
kernel-kdump-devel
Red Hat:enterprise_linux:5::server
From an advisory covering 11 CVEs
 before 0:2.6.18-164.11.1.el5
0:2.6.18-164.11.1.el5
kernel-xen
Red Hat:enterprise_linux:5::server
From an advisory covering 11 CVEs
 before 0:2.6.18-164.11.1.el5
0:2.6.18-164.11.1.el5
kernel-xen-debuginfo
Red Hat:enterprise_linux:5::server
From an advisory covering 11 CVEs
 before 0:2.6.18-164.11.1.el5
0:2.6.18-164.11.1.el5
kernel-xen-devel
Red Hat:enterprise_linux:5::server
From an advisory covering 11 CVEs
 before 0:2.6.18-164.11.1.el5
0:2.6.18-164.11.1.el5
kernel
Red Hat:rhel_eus:5.3
From an advisory covering 3 CVEs
 before 0:2.6.18-128.14.1.el5
0:2.6.18-128.14.1.el5
kernel-PAE
Red Hat:rhel_eus:5.3
From an advisory covering 3 CVEs
 before 0:2.6.18-128.14.1.el5
0:2.6.18-128.14.1.el5
kernel-PAE-debuginfo
Red Hat:rhel_eus:5.3
From an advisory covering 3 CVEs
 before 0:2.6.18-128.14.1.el5
0:2.6.18-128.14.1.el5
kernel-PAE-devel
Red Hat:rhel_eus:5.3
From an advisory covering 3 CVEs
 before 0:2.6.18-128.14.1.el5
0:2.6.18-128.14.1.el5
kernel-debug
Red Hat:rhel_eus:5.3
From an advisory covering 3 CVEs
 before 0:2.6.18-128.14.1.el5
0:2.6.18-128.14.1.el5
kernel-debug-debuginfo
Red Hat:rhel_eus:5.3
From an advisory covering 3 CVEs
 before 0:2.6.18-128.14.1.el5
0:2.6.18-128.14.1.el5
kernel-debug-devel
Red Hat:rhel_eus:5.3
From an advisory covering 3 CVEs
 before 0:2.6.18-128.14.1.el5
0:2.6.18-128.14.1.el5
kernel-debuginfo
Red Hat:rhel_eus:5.3
From an advisory covering 3 CVEs
 before 0:2.6.18-128.14.1.el5
0:2.6.18-128.14.1.el5
kernel-debuginfo-common
Red Hat:rhel_eus:5.3
From an advisory covering 3 CVEs
 before 0:2.6.18-128.14.1.el5
0:2.6.18-128.14.1.el5
kernel-devel
Red Hat:rhel_eus:5.3
From an advisory covering 3 CVEs
 before 0:2.6.18-128.14.1.el5
0:2.6.18-128.14.1.el5
kernel-doc
Red Hat:rhel_eus:5.3
From an advisory covering 3 CVEs
 before 0:2.6.18-128.14.1.el5
0:2.6.18-128.14.1.el5
kernel-kdump
Red Hat:rhel_eus:5.3
From an advisory covering 3 CVEs
 before 0:2.6.18-128.14.1.el5
0:2.6.18-128.14.1.el5
kernel-kdump-debuginfo
Red Hat:rhel_eus:5.3
From an advisory covering 3 CVEs
 before 0:2.6.18-128.14.1.el5
0:2.6.18-128.14.1.el5
kernel-kdump-devel
Red Hat:rhel_eus:5.3
From an advisory covering 3 CVEs
 before 0:2.6.18-128.14.1.el5
0:2.6.18-128.14.1.el5
kernel-xen
Red Hat:rhel_eus:5.3
From an advisory covering 3 CVEs
 before 0:2.6.18-128.14.1.el5
0:2.6.18-128.14.1.el5
kernel-xen-debuginfo
Red Hat:rhel_eus:5.3
From an advisory covering 3 CVEs
 before 0:2.6.18-128.14.1.el5
0:2.6.18-128.14.1.el5
kernel-xen-devel
Red Hat:rhel_eus:5.3
From an advisory covering 3 CVEs
 before 0:2.6.18-128.14.1.el5
0:2.6.18-128.14.1.el5
kernel-rt
Red Hat:enterprise_mrg:1::el5
From an advisory covering 9 CVEs
 before 0:2.6.24.7-149.el5rt
0:2.6.24.7-149.el5rt
kernel-rt-debug
Red Hat:enterprise_mrg:1::el5
From an advisory covering 9 CVEs
 before 0:2.6.24.7-149.el5rt
0:2.6.24.7-149.el5rt
kernel-rt-debug-debuginfo
Red Hat:enterprise_mrg:1::el5
From an advisory covering 9 CVEs
 before 0:2.6.24.7-149.el5rt
0:2.6.24.7-149.el5rt
kernel-rt-debug-devel
Red Hat:enterprise_mrg:1::el5
From an advisory covering 9 CVEs
 before 0:2.6.24.7-149.el5rt
0:2.6.24.7-149.el5rt
kernel-rt-debuginfo
Red Hat:enterprise_mrg:1::el5
From an advisory covering 9 CVEs
 before 0:2.6.24.7-149.el5rt
0:2.6.24.7-149.el5rt
kernel-rt-debuginfo-common
Red Hat:enterprise_mrg:1::el5
From an advisory covering 9 CVEs
 before 0:2.6.24.7-149.el5rt
0:2.6.24.7-149.el5rt
kernel-rt-devel
Red Hat:enterprise_mrg:1::el5
From an advisory covering 9 CVEs
 before 0:2.6.24.7-149.el5rt
0:2.6.24.7-149.el5rt
kernel-rt-doc
Red Hat:enterprise_mrg:1::el5
From an advisory covering 9 CVEs
 before 0:2.6.24.7-149.el5rt
0:2.6.24.7-149.el5rt
kernel-rt-trace
Red Hat:enterprise_mrg:1::el5
From an advisory covering 9 CVEs
 before 0:2.6.24.7-149.el5rt
0:2.6.24.7-149.el5rt
kernel-rt-trace-debuginfo
Red Hat:enterprise_mrg:1::el5
From an advisory covering 9 CVEs
 before 0:2.6.24.7-149.el5rt
0:2.6.24.7-149.el5rt
kernel-rt-trace-devel
Red Hat:enterprise_mrg:1::el5
From an advisory covering 9 CVEs
 before 0:2.6.24.7-149.el5rt
0:2.6.24.7-149.el5rt
kernel-rt-vanilla
Red Hat:enterprise_mrg:1::el5
From an advisory covering 9 CVEs
 before 0:2.6.24.7-149.el5rt
0:2.6.24.7-149.el5rt
kernel-rt-vanilla-debuginfo
Red Hat:enterprise_mrg:1::el5
From an advisory covering 9 CVEs
 before 0:2.6.24.7-149.el5rt
0:2.6.24.7-149.el5rt
kernel-rt-vanilla-devel
Red Hat:enterprise_mrg:1::el5
From an advisory covering 9 CVEs
 before 0:2.6.24.7-149.el5rt
0:2.6.24.7-149.el5rt

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
Exploit-DBLinux Kernel < 2.6.28 - 'fasync_helper()' Local Privilege Escalation2009-12-16

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, Exploit-DB, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2009-4141 is a high vulnerability (CVSS 7.2) in Linux Kernel, published January 19, 2010. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.97%, the 62nd percentile. No source names a fixed version.

References

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