CVE-2009-4895: Null Pointer Dereference
First published: Wed Jan 27 2010(Updated: )
Description of problem: Changes to tty to use struct pid happened here: ab521dc0f8e117fd808d3e425216864d60390500 mrg-1/rhel-6 are missing: 1) redo locking of tty->pgrp 47f86834bbd4193139d61d659bebf9ab9d691e37 2) tty: fix race in tty_fasync 703625118069f9f8960d356676662d3db5a9d116 3) fnctl: f_modown should call write_lock_irqsave/restore b04da8bfdfbbd79544cab2fadfdc12e87eb01600
Credit: cve@mitre.org cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/linux-2.6 | ||
| Linux kernel | <2.6.32.6 | |
| Debian | =5.0 | |
| Ubuntu Linux | =6.06 | |
| Ubuntu Linux | =8.04 | |
| Ubuntu Linux | =9.04 | |
| Ubuntu Linux | =9.10 | |
| Ubuntu Linux | =10.04 | |
| Ubuntu Linux | =10.10 | |
| Linux Kernel | <2.6.32.6 | |
| Ubuntu | =6.06 | |
| Ubuntu | =8.04 | |
| Ubuntu | =9.04 | |
| Ubuntu | =9.10 | |
| Ubuntu | =10.04 | |
| Ubuntu | =10.10 |
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Reference Links
- http://www.openwall.com/lists/oss-security/2010/06/15/4
- http://www.openwall.com/lists/oss-security/2010/06/15/2
- https://bugzilla.redhat.com/show_bug.cgi?id=559100
- http://www.openwall.com/lists/oss-security/2010/06/15/5
- http://www.openwall.com/lists/oss-security/2010/06/15/3
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=703625118069f9f8960d356676662d3db5a9d116
- https://bugzilla.kernel.org/show_bug.cgi?id=14605
- http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.32.6
- http://www.debian.org/security/2010/dsa-2094
- http://www.ubuntu.com/usn/USN-1000-1
- https://launchpad.net/bugs/cve/CVE-2009-4895
- http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftorvalds%2Flinux-2.6.git;a=commitdiff_plain;h=47f86834bbd4193139d61d659bebf9ab9d691e37
- http://admin.fedoraproject.org/updates/kernel-2.6.30.10-105.2.13.fc11
- http://admin.fedoraproject.org/updates/kernel-2.6.31.12-174.2.17.fc12
- http://admin.fedoraproject.org/updates/kernel-2.6.31.12-174.2.19.fc12
- https://rhn.redhat.com/errata/RHSA-2010-0161.html
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=703625118069f9f8960d356676662d3db5a9d116
- https://security-tracker.debian.org/tracker/CVE-2009-4895
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-4895
- https://nvd.nist.gov/vuln/detail/CVE-2009-4895
- https://ubuntu.com/security/CVE-2009-4895
Frequently Asked Questions
What is the severity of CVE-2009-4895?
CVE-2009-4895 has a medium severity due to potential race conditions affecting tty devices.
How do I fix CVE-2009-4895?
To fix CVE-2009-4895, apply the relevant patches from your Linux distribution that address the tty locking issues.
Which versions of Linux are affected by CVE-2009-4895?
CVE-2009-4895 affects various versions of the Linux kernel including those prior to 2.6.32.6 and specific Debian and Ubuntu releases.
What impact does CVE-2009-4895 have on system security?
CVE-2009-4895 can lead to privilege escalation or denial of service due to improper handling of concurrent tty operations.
What types of systems are running vulnerable software for CVE-2009-4895?
Systems running affected versions of the Linux kernel, Debian Linux 5.0, or specific Ubuntu releases like 6.06 to 10.10 are vulnerable to CVE-2009-4895.
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