{"id":"CVE-2007-3731","aliases":["DSA-1378-1","DSA-1378-2","EUVD-2007-3715","GHSA-frx9-99ch-7q7j","RHSA-2007:0940"],"status":"published","title":"The Linux kernel 2.6.20 and 2.6.21 does not properly handle an invalid LDT segment selector in ...","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 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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.","status":"published","published":"2007-09-17T17:00:00Z","modified":"2024-08-07T14:28:52.052Z","updated_at":"2026-11-02T13:32:56.730199Z"}],"euvd":[{"id":"EUVD-2007-3715","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 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