What is CVE-2007-3731?

CVE-2007-3731 is a Medium severity Linux kernel vulnerability with a CVSS score of 4.9 out of 10, classified as a Improper Input Validation flaw (CWE-20). CVE-2007-3731 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2007-3731?

CVE-2007-3731 has a CVSS score of 4.9 out of 10, rated Medium severity. The vector string is AV:L/AC:L/Au:N/C:N/I:N/A:C.

Is there a patch available for CVE-2007-3731?

No patch is currently available for CVE-2007-3731. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2007-3731 actively exploited?

CVE-2007-3731 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2007-3731

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.

Package Linux Kernel

Published 2007-09-17

Last modified 2026-04-23

CVSS version 2.0

Patch available

Awaiting data

CVSS 2.0 score

4.9

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

User Interaction

Scope

Confidentiality

Low

Integrity

None

Availability

Vector string

AV:L/AC:L/Au:N/C:N/I:N/A:C

Weakness type

CWE-20

CVE-2007-3731 is a Improper Input Validation vulnerability

What is Improper Input Validation?

The product receives input but does not validate it correctly, allowing attackers to craft inputs that cause unexpected behavior. Learn more on MITRE CWE

References

The following references provide additional information about CVE-2007-3731 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel.org
http://bugzilla.kernel.org/show_bug.cgi?id=8765

Exploit
Osvdb
http://osvdb.org/37286
Secunia
http://secunia.com/advisories/26935
Secunia
http://secunia.com/advisories/26955
Secunia
http://secunia.com/advisories/26978
Secunia
http://secunia.com/advisories/27322
Secunia
http://secunia.com/advisories/29159
Wiki
http://wiki.rpath.com/wiki/Advisories:rPSA-2008-0094
Debian Security
http://www.debian.org/security/2007/dsa-1378
Red Hat
http://www.redhat.com/support/errata/RHSA-2007-0940.html
Securityfocus
http://www.securityfocus.com/archive/1/488972/100/0/threaded
Securityfocus
http://www.securityfocus.com/bid/25801
Ubuntu Security
http://www.ubuntu.com/usn/usn-518-1
Issues
https://issues.rpath.com/browse/RPL-2304
Oval
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10394
Kernel patch commit
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commitdiff%3Bh=29eb51101c02df517ca64ec472d7501127ad1da8
Patch
Kernel patch commit
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commitdiff%3Bh=a10d9a71bafd3a283da240d2868e71346d2aef6f
Patch
Kernel patch commit
https://bugzilla.redhat.com/show_bug.cgi?id=248324
Patch

Details

CVE ID CVE-2007-3731

Severity Medium

CVSS score 4.9 / 10

CVSS version 2.0

Published 2007-09-17

Modified 2026-04-23

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2007-3731?

CVE-2007-3731 is a Medium severity Linux kernel vulnerability with a CVSS score of 4.9 out of 10 , classified as an Improper Input Validation flaw (CWE-20) . CVE-2007-3731 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2007-3731?

CVE-2007-3731 has a CVSS score of 4.9 out of 10, rated Medium severity (CVSS 2.0). The vector string is AV:L/AC:L/Au:N/C:N/I:N/A:C.
Is there a patch available for CVE-2007-3731?

No patch is currently available for CVE-2007-3731. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2007-3731 actively exploited?

No — CVE-2007-3731 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
What is Improper Input Validation (CWE-20)?

The product receives input but does not validate it correctly, allowing attackers to craft inputs that cause unexpected behavior. View CWE-20 on MITRE CWE →