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…

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.

Scores

EPSS (exploitation in 30 days)

0.51% · top 56% of all CVEs (4 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.9.

Weakness

• n/a
• CWE-20 (opens in a new tab)All about CWE-20 and its CVEs

Affected products

• n/a

  • affected n/a

References (18)

• 25801 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
• http://bugzilla.kernel.org/show_bug.cgi?id=8765 (opens in a new tab)x_refsource_MISCx_transferred
• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commitdiff%3Bh=a10d9a71bafd3a283da240d2868e71346d2aef6f (opens in a new tab)x_refsource_CONFIRMx_transferred
• 37286 (opens in a new tab)vdb-entryx_refsource_OSVDBx_transferred
• RHSA-2007:0940 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
• 29159 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commitdiff%3Bh=29eb51101c02df517ca64ec472d7501127ad1da8 (opens in a new tab)x_refsource_CONFIRMx_transferred
• 27322 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• http://wiki.rpath.com/wiki/Advisories:rPSA-2008-0094 (opens in a new tab)x_refsource_CONFIRMx_transferred
• 26978 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• 20080229 rPSA-2008-0094-1 kernel (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
• https://issues.rpath.com/browse/RPL-2304 (opens in a new tab)x_refsource_CONFIRMx_transferred
• USN-518-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
• 26955 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• oval:org.mitre.oval:def:10394 (opens in a new tab)vdb-entrysignaturex_refsource_OVALx_transferred
• https://bugzilla.redhat.com/show_bug.cgi?id=248324 (opens in a new tab)x_refsource_CONFIRMx_transferred
• 26935 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• DSA-1378 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2007-3731](https://trackcve.app/badge/CVE-2007-3731.svg)](https://trackcve.app/cve/CVE-2007-3731)

Record last updated 7 Aug 2024, 14:28 UTC.