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CVE-2009-3623

7.8 · HIGH

The lookup_cb_cred function in fs/nfsd/nfs4callback.c in the nfsd4 subsystem in the Linux kernel before 2.6.31.2 attempts to access a credentials cache even when a client specifies the AUTH_NULL au…

Published Oct 30, 2009linuxCWE-287EPSS 3.47%

Overview

CVE-2009-3623 is a high-severity vulnerability affecting linux linux_kernel. It was published on October 30, 2009 and has a CVSS 2.0 base score of 7.8 (HIGH).

This vulnerability has a CVSS 2.0 base score of 7.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

The lookup_cb_cred function in fs/nfsd/nfs4callback.c in the nfsd4 subsystem in the Linux kernel before 2.6.31.2 attempts to access a credentials cache even when a client specifies the AUTH_NULL authentication flavor, which allows remote attackers to cause a denial of service (NULL pointer dereference and system crash) via an NFSv4 mount request.

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
linuxlinux_kernel0Affected

References

Refgit.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=80fc015bdfe1f5b870c1e1ee02d78e709523fee7Refgit.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=886e3b7fe6054230c89ae078a09565ed183ecc73Refmarc.info/?l=oss-security&m=125618753029631&w=2Refmarc.info/?l=oss-security&m=125624036516377&w=2Refwww.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.31.2Refwww.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.32-rc1Refwww.ubuntu.com/usn/usn-864-1Refbugzilla.redhat.com/show_bug.cgi?id=530269Refgit.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=80fc015bdfe1f5b870c1e1ee02d78e709523fee7Refgit.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=886e3b7fe6054230c89ae078a09565ed183ecc73

How CyberStrike helps

Frequently asked questions

What is CVE-2009-3623?

CVE-2009-3623 is a high-severity vulnerability affecting linux linux_kernel. It was published on October 30, 2009 and has a CVSS 2.0 base score of 7.8 (HIGH).

How severe is CVE-2009-3623?

This vulnerability has a CVSS 2.0 base score of 7.8, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2009-3623?

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2009-3623?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2009-3623 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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