CVE-2009-3726

CVE-2009-3726 is a high-severity vulnerability in Linux Linux Kernel with a CVSS 2.0 base score of 7.8. Its EPSS exploit-prediction score of 12% places it in the 96th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-399.

Key facts

• Severity: High (CVSS 2.0 base score 7.8)
• EPSS exploit prediction: 12% (96th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-399
• Affected product: Linux Linux Kernel
• Published: 2009-11-09
• Last modified: 2026-06-16

Description

The nfs4_proc_lock function in fs/nfs/nfs4proc.c in the NFSv4 client in the Linux kernel before 2.6.31-rc4 allows remote NFS servers to cause a denial of service (NULL pointer dereference and panic) by sending a certain response containing incorrect file attributes, which trigger attempted use of an open file that lacks NFSv4 state.

Frequently asked questions

What is CVE-2009-3726?

The nfs4_proc_lock function in fs/nfs/nfs4proc.c in the NFSv4 client in the Linux kernel before 2.6.31-rc4 allows remote NFS servers to cause a denial of service (NULL pointer dereference and panic) by sending a certain response containing incorrect file attributes, which trigger attempted use of an open file that lacks NFSv4 state.

How severe is CVE-2009-3726?

CVE-2009-3726 has a CVSS 2.0 base score of 7.8, rated high severity.

Is CVE-2009-3726 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 12% (96th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-3726?

CVE-2009-3726 primarily affects Linux Linux Kernel. In total, 403 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-3726?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2009-3726 published?

CVE-2009-3726 was published on 2009-11-09 and last updated on 2026-06-16.

References

• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=d953126a28f97ec965d23c69fd5795854c048f30
• http://lists.opensuse.org/opensuse-security-announce/2009-11/msg00007.html
• http://lists.opensuse.org/opensuse-security-announce/2009-12/msg00002.html
• http://lists.opensuse.org/opensuse-security-announce/2009-12/msg00005.html
• http://lists.opensuse.org/opensuse-security-announce/2010-02/msg00005.html
• http://lists.vmware.com/pipermail/security-announce/2010/000082.html
• http://secunia.com/advisories/37909
• http://secunia.com/advisories/38794
• http://secunia.com/advisories/38834
• http://secunia.com/advisories/40218
• http://www.debian.org/security/2010/dsa-2005
• http://www.kernel.org/pub/linux/kernel/v2.6/testing/v2.6.31/ChangeLog-2.6.31-rc4
• http://www.mandriva.com/security/advisories?name=MDVSA-2009:329
• http://www.mandriva.com/security/advisories?name=MDVSA-2011:051
• http://www.openwall.com/lists/oss-security/2009/11/05/1
• http://www.openwall.com/lists/oss-security/2009/11/05/4
• http://www.redhat.com/support/errata/RHSA-2009-1670.html
• http://www.redhat.com/support/errata/RHSA-2010-0474.html
• http://www.securityfocus.com/bid/36936
• http://www.spinics.net/linux/lists/linux-nfs/msg03357.html
• http://www.ubuntu.com/usn/usn-864-1
• http://www.vupen.com/english/advisories/2010/0528
• https://bugzilla.redhat.com/show_bug.cgi?id=529227
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6636
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9734

Affected products (403)

• cpe:2.3:o:linux:linux_kernel:*:rc3:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.2.27:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.1:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.2:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.3:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.4:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.5:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.6:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.7:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.8:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.9:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.10:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.11:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.12:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.13:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.14:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.15:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.16:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.17:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.18:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.19:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.20:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.21:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.22:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.23:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.24:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.25:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.26:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.27:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.28:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.29:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.29:-rc1:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.29:-rc2:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.30:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.30:rc2:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.30:rc3:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.31:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.32:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.33:*:*:*:*:*:*:*
• cpe:2.3:o:linux:linux_kernel:2.4.34.3:*:*:*:*:*:*:*

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