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CVE-2007-3731

4.9 · MEDIUM

The Linux kernel 2.6.20 and 2.6.21 does not properly handle an invalid LDT segment selector in %cs (the xcs field) during ptrace single-step operations, which allows local users to cause a denial o…

Published Sep 17, 2007linuxCWE-20EPSS 0.51%

Overview

CVE-2007-3731 is a medium-severity vulnerability affecting linux linux_kernel. It was published on September 17, 2007 and has a CVSS 2.0 base score of 4.9 (MEDIUM).

This vulnerability has a CVSS 2.0 base score of 4.9, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

The Linux kernel 2.6.20 and 2.6.21 does not properly handle an invalid LDT segment selector in %cs (the xcs field) during ptrace single-step operations, which allows local users to cause a denial of service (NULL dereference and OOPS) via certain code that makes ptrace PTRACE_SETREGS and PTRACE_SINGLESTEP requests, related to the TRACE_IRQS_ON function, and possibly related to the arch_ptrace function.

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

References

Refbugzilla.kernel.org/show_bug.cgi?id=8765Refgit.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commitdiff%3Bh=29eb51101c02df517ca64ec472d7501127ad1da8Refgit.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commitdiff%3Bh=a10d9a71bafd3a283da240d2868e71346d2aef6fRefosvdb.org/37286Refsecunia.com/advisories/26935Refsecunia.com/advisories/26955Refsecunia.com/advisories/26978Refsecunia.com/advisories/27322Refsecunia.com/advisories/29159Refwiki.rpath.com/wiki/Advisories:rPSA-2008-0094

How CyberStrike helps

Frequently asked questions

What is CVE-2007-3731?

CVE-2007-3731 is a medium-severity vulnerability affecting linux linux_kernel. It was published on September 17, 2007 and has a CVSS 2.0 base score of 4.9 (MEDIUM).

How severe is CVE-2007-3731?

This vulnerability has a CVSS 2.0 base score of 4.9, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2007-3731?

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-2007-3731?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2007-3731 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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