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CVE-2007-3731

The Linux kernel 2.6.20 and 2.6.21 does not properly handle an invalid LDT segment selector in ...

4.9 Medium

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.

Exploit likelihood

0.51%Down 1.0 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 4.9

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.

Record
CVE-2007-3731
CVSS 2.0
4.9 MediumAV:L/AC:L/Au:N/C:N/I:N/A:C
Weakness
CWE-20
Updated
2026-11-02
CVE List No score

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.

Record
CVE-2007-3731
Updated
2026-11-02
EUVDEUVD-2007-3715 No score

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.

Record
EUVD-2007-3715
Updated
2026-11-03
GitHub AdvisoriesGHSA-frx9-99ch-7q7j No score

The Linux kernel 2.6.20 and 2.6.21 does not properly handle an invalid LDT segment selector in ...

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.

Record
GHSA-frx9-99ch-7q7j
Weakness
CWE-20
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
linux-2.6
Debian:4.0
From an advisory covering 5 CVEs
 before 2.6.18.dfsg.1-13etch3, plus listed versions
2.6.18.dfsg.1-122.6.18.dfsg.1-12etch12.6.18.dfsg.1-12etch22.6.18.dfsg.1-132.6.18.dfsg.1-13etch12.6.18.dfsg.1-13etch2
2.6.18.dfsg.1-13etch3
fai-kernels
Debian:4.0
From an advisory covering 5 CVEs
 before 1.17+etch.13etch3, plus listed versions
1.171.17+etch11.17+etch21.17+etch31.17+etch41.17+etch51.17etch1
1.17+etch.13etch3
user-mode-linux
Debian:4.0
From an advisory covering 5 CVEs
 before 2.6.18-1um-2etch.13etch3, plus listed versions
2.6.18-1um-22.6.18-1um-2etch12.6.18-1um-2etch22.6.18-1um-2etch32.6.18-1um-2etch4
2.6.18-1um-2etch.13etch3
kernel
Red Hat:enterprise_linux:5::client
From an advisory covering 9 CVEs
 before 0:2.6.18-8.1.15.el5
0:2.6.18-8.1.15.el5
kernel-PAE
Red Hat:enterprise_linux:5::client
From an advisory covering 9 CVEs
 before 0:2.6.18-8.1.15.el5
0:2.6.18-8.1.15.el5
kernel-PAE-debuginfo
Red Hat:enterprise_linux:5::client
From an advisory covering 9 CVEs
 before 0:2.6.18-8.1.15.el5
0:2.6.18-8.1.15.el5
kernel-PAE-devel
Red Hat:enterprise_linux:5::client
From an advisory covering 9 CVEs
 before 0:2.6.18-8.1.15.el5
0:2.6.18-8.1.15.el5
kernel-debuginfo
Red Hat:enterprise_linux:5::client
From an advisory covering 9 CVEs
 before 0:2.6.18-8.1.15.el5
0:2.6.18-8.1.15.el5
kernel-debuginfo-common
Red Hat:enterprise_linux:5::client
From an advisory covering 9 CVEs
 before 0:2.6.18-8.1.15.el5
0:2.6.18-8.1.15.el5
kernel-devel
Red Hat:enterprise_linux:5::client
From an advisory covering 9 CVEs
 before 0:2.6.18-8.1.15.el5
0:2.6.18-8.1.15.el5
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Affected packages
PackageAffectedFixed
kernel-doc
Red Hat:enterprise_linux:5::client
From an advisory covering 9 CVEs
 before 0:2.6.18-8.1.15.el5
0:2.6.18-8.1.15.el5
kernel-xen
Red Hat:enterprise_linux:5::client
From an advisory covering 9 CVEs
 before 0:2.6.18-8.1.15.el5
0:2.6.18-8.1.15.el5
kernel-xen-debuginfo
Red Hat:enterprise_linux:5::client
From an advisory covering 9 CVEs
 before 0:2.6.18-8.1.15.el5
0:2.6.18-8.1.15.el5
kernel-xen-devel
Red Hat:enterprise_linux:5::client
From an advisory covering 9 CVEs
 before 0:2.6.18-8.1.15.el5
0:2.6.18-8.1.15.el5
kernel
Red Hat:enterprise_linux:5::server
From an advisory covering 9 CVEs
 before 0:2.6.18-8.1.15.el5
0:2.6.18-8.1.15.el5
kernel-PAE
Red Hat:enterprise_linux:5::server
From an advisory covering 9 CVEs
 before 0:2.6.18-8.1.15.el5
0:2.6.18-8.1.15.el5
kernel-PAE-debuginfo
Red Hat:enterprise_linux:5::server
From an advisory covering 9 CVEs
 before 0:2.6.18-8.1.15.el5
0:2.6.18-8.1.15.el5
kernel-PAE-devel
Red Hat:enterprise_linux:5::server
From an advisory covering 9 CVEs
 before 0:2.6.18-8.1.15.el5
0:2.6.18-8.1.15.el5
kernel-debuginfo
Red Hat:enterprise_linux:5::server
From an advisory covering 9 CVEs
 before 0:2.6.18-8.1.15.el5
0:2.6.18-8.1.15.el5
kernel-debuginfo-common
Red Hat:enterprise_linux:5::server
From an advisory covering 9 CVEs
 before 0:2.6.18-8.1.15.el5
0:2.6.18-8.1.15.el5
kernel-devel
Red Hat:enterprise_linux:5::server
From an advisory covering 9 CVEs
 before 0:2.6.18-8.1.15.el5
0:2.6.18-8.1.15.el5
kernel-doc
Red Hat:enterprise_linux:5::server
From an advisory covering 9 CVEs
 before 0:2.6.18-8.1.15.el5
0:2.6.18-8.1.15.el5
kernel-kdump
Red Hat:enterprise_linux:5::server
From an advisory covering 9 CVEs
 before 0:2.6.18-8.1.15.el5
0:2.6.18-8.1.15.el5
kernel-kdump-debuginfo
Red Hat:enterprise_linux:5::server
From an advisory covering 9 CVEs
 before 0:2.6.18-8.1.15.el5
0:2.6.18-8.1.15.el5
kernel-kdump-devel
Red Hat:enterprise_linux:5::server
From an advisory covering 9 CVEs
 before 0:2.6.18-8.1.15.el5
0:2.6.18-8.1.15.el5
kernel-xen
Red Hat:enterprise_linux:5::server
From an advisory covering 9 CVEs
 before 0:2.6.18-8.1.15.el5
0:2.6.18-8.1.15.el5
kernel-xen-debuginfo
Red Hat:enterprise_linux:5::server
From an advisory covering 9 CVEs
 before 0:2.6.18-8.1.15.el5
0:2.6.18-8.1.15.el5
kernel-xen-devel
Red Hat:enterprise_linux:5::server
From an advisory covering 9 CVEs
 before 0:2.6.18-8.1.15.el5
0:2.6.18-8.1.15.el5

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
affected, aliases, facts, references, titleGitHub Advisories, OSV
first indexedCVE List, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2007-3731 is a medium vulnerability (CVSS 4.9) in Linux Kernel, published September 17, 2007. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.51%, the 43rd percentile. No source names a fixed version.

References

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