Unrated severityNVD Advisory· Published Sep 17, 2007· Updated Jun 16, 2026
CVE-2007-3731
CVE-2007-3731
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.
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Affected products
3Patches
Vulnerability mechanics
References
18- bugzilla.redhat.com/show_bug.cginvdPatch
- bugzilla.kernel.org/show_bug.cginvdExploit
- git.kernel.orgnvd
- git.kernel.orgnvd
- osvdb.org/37286nvd
- secunia.com/advisories/26935nvd
- secunia.com/advisories/26955nvd
- secunia.com/advisories/26978nvd
- secunia.com/advisories/27322nvd
- secunia.com/advisories/29159nvd
- wiki.rpath.com/wiki/Advisories:rPSA-2008-0094nvd
- www.debian.org/security/2007/dsa-1378nvd
- www.redhat.com/support/errata/RHSA-2007-0940.htmlnvd
- www.securityfocus.com/archive/1/488972/100/0/threadednvd
- www.securityfocus.com/bid/25801nvd
- www.ubuntu.com/usn/usn-518-1nvd
- issues.rpath.com/browse/RPL-2304nvd
- oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10394nvd
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