CVE-2007-3731: n/a vulnerability

CVE-2007-3731: The Linux kernel 2.6.20 and 2.6.21 does not properly handle an invalid LDT segment selector in %cs (the xcs...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 7, 2024, 14:28 UTC (UTC+00:00)

Security readout for executives and security teams

This is an old Linux kernel flaw that could let a local user crash the system. It is not a remote break-in issue in the provided sources, but it can disrupt availability on systems still running affected 2.6.20 or 2.6.21-era kernels. Exposure is most likely on legacy Linux hosts, appliances, or unsupported distributions still using affected 2.6.20 or 2.6.21-based kernels or vendor backports identified in 2007 advisories. Treat this as a legacy availability risk. It is unlikely to drive emergency internet-facing response, but any still-exposed production system should be patched, isolated, or retired because local denial of service can still cause outage. Mitigation focus: Identify systems running Linux 2.6.20, 2.6.21, or related vendor kernels.; Apply vendor kernel updates referenced by Red Hat, Debian, Ubuntu, or rPath guidance.; For unsupported legacy systems, check vendor guidance and plan replacement or isolation..

Prepared: Jun 29, 2026, 03:38 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Sep 17, 2007, 17:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

4Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://issues.rpath.com/browse/RPL-2304CVE reference · x_refsource_CONFIRM
oval:org.mitre.oval:def:10394CVE reference · vdb-entry, signature
https://bugzilla.redhat.com/show_bug.cgi?id=248324CVE reference · x_refsource_CONFIRM

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

No CWE listed

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