CVE-2009-4895

Name: CVE-2009-4895
Creator: NVD / NIST
Published: 2010-09-08T20:00:02.62+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.7/10EPSS 0.26%

Last modified Jun 16, 2026

CVE-2009-4895 is a medium-severity vulnerability rated 4.7/10 on the CVSS scale. Race condition in the tty_fasync function in drivers/char/tty_io.c in the Linux kernel before 2.6.32.6 allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact via unknown vectors, related to the put_tty_queue and __f_setown functions. NOTE: the vulnerability was addressed in a different way in 2.6.32.9.. EPSS estimates a 0.26% chance of exploitation in the next 30 days.

Description

Race condition in the tty_fasync function in drivers/char/tty_io.c in the Linux kernel before 2.6.32.6 allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact via unknown vectors, related to the put_tty_queue and __f_setown functions. NOTE: the vulnerability was addressed in a different way in 2.6.32.9.

Metrics

CVSS 3.1

4.7/10

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.26%

17.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	< 2.6.32.6
Debian	Debian Linux	5.0
Canonical	Ubuntu Linux	6.06
Canonical	Ubuntu Linux	8.04
Canonical	Ubuntu Linux	9.04
Canonical	Ubuntu Linux	9.10
Canonical	Ubuntu Linux	10.04
Canonical	Ubuntu Linux	10.10

References

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=703625118069f9f8960d356676662d3db5a9d116Broken Link
http://www.debian.org/security/2010/dsa-2094Third Party Advisory
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.32.6Broken Link
http://www.openwall.com/lists/oss-security/2010/06/15/2Mailing List, Patch, Third Party Advisory
http://www.openwall.com/lists/oss-security/2010/06/15/3Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2010/06/15/4Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2010/06/15/5Mailing List, Third Party Advisory
http://www.ubuntu.com/usn/USN-1000-1Third Party Advisory
https://bugzilla.kernel.org/show_bug.cgi?id=14605Issue Tracking, Patch
https://bugzilla.redhat.com/show_bug.cgi?id=559100Issue Tracking, Third Party Advisory
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=703625118069f9f8960d356676662d3db5a9d116Broken Link
http://www.debian.org/security/2010/dsa-2094Third Party Advisory
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.32.6Broken Link
http://www.openwall.com/lists/oss-security/2010/06/15/2Mailing List, Patch, Third Party Advisory
http://www.openwall.com/lists/oss-security/2010/06/15/3Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2010/06/15/4Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2010/06/15/5Mailing List, Third Party Advisory
http://www.ubuntu.com/usn/USN-1000-1Third Party Advisory
https://bugzilla.kernel.org/show_bug.cgi?id=14605Issue Tracking, Patch
https://bugzilla.redhat.com/show_bug.cgi?id=559100Issue Tracking, Third Party Advisory

Timeline

Published: Sep 8, 2010
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2009-4895?

How severe is CVE-2009-4895?

CVE-2009-4895 has a CVSS score of 4.7/10 (MEDIUM severity). The EPSS model estimates a 0.26% probability of exploitation in the next 30 days.

How do I fix CVE-2009-4895?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2009-4895?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST