VULNERABILITY INTELLIGENCE
CVE-2007-3731
CVSS score4.9 MEDIUM
EPSS probability0.51%
CISA KEVNot currently listed
Published2007-09-17
Last modified2026-06-16
CVSS vectorAV:L/AC:L/Au:N/C:N/I:N/A:C
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.
Weakness classification
- CWE-20: Improper Input Validation