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 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.
Key facts
- CVSS score
- 4.9 (v2.0)
- Severity
- MEDIUM
- CVSS vector
AV:L/AC:L/Au:N/C:N/I:N/A:C- Weakness (CWE)
- CWE-20
- EPSS score
- 0.5% (44th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2007-3715)
- Published
- September 17, 2007
- NVD last modified
- June 16, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2007-3715 in the EU Vulnerability Database. Last updated in EUVD on August 7, 2024.
View on the EU Vulnerability DatabaseAffected products
- linux / linux kernel
- linux / linux kernel
References
- http://bugzilla.kernel.org/show_bug.cgi?id=8765(Exploit)
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commitdiff%3Bh=29eb51101c02df517ca64ec472d7501127ad1da8
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commitdiff%3Bh=a10d9a71bafd3a283da240d2868e71346d2aef6f
- http://osvdb.org/37286
- http://secunia.com/advisories/26935
- http://secunia.com/advisories/26955
- http://secunia.com/advisories/26978
- http://secunia.com/advisories/27322
- http://secunia.com/advisories/29159
- http://wiki.rpath.com/wiki/Advisories:rPSA-2008-0094
- http://www.debian.org/security/2007/dsa-1378
- http://www.redhat.com/support/errata/RHSA-2007-0940.html
- http://www.securityfocus.com/archive/1/488972/100/0/threaded
- http://www.securityfocus.com/bid/25801
- http://www.ubuntu.com/usn/usn-518-1
- https://bugzilla.redhat.com/show_bug.cgi?id=248324(Patch)
- https://issues.rpath.com/browse/RPL-2304
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10394
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
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