CVE-2011-4621
First published: Wed Dec 21 2011(Updated: )
A tight loop in user level process isn't preempted unless a realtime process is woken up on the cpu. Some important kernel threads such as events/*, kblockd/* can be blocked by the process, and the machine stalls. Unprivileged local user could use this flaw to DoS the system. Upstream commit: <a href="http://git.kernel.org/linus/f26f9aff6aaf67e9a430d16c266f91b13a5bff64">http://git.kernel.org/linus/f26f9aff6aaf67e9a430d16c266f91b13a5bff64</a> Reference: <a href="https://lkml.org/lkml/2010/11/20/212">https://lkml.org/lkml/2010/11/20/212</a> Acknowledgements: Red Hat would like to thank Masaki Tachibana for reporting this issue.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/linux-2.6 | ||
| Linux kernel | <2.6.37 | |
| Linux Kernel | <2.6.37 |
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Reference Links
- https://github.com/torvalds/linux/commit/f26f9aff6aaf67e9a430d16c266f91b13a5bff64
- http://ftp.osuosl.org/pub/linux/kernel/v2.6/ChangeLog-2.6.37
- https://bugzilla.redhat.com/show_bug.cgi?id=769711
- http://www.openwall.com/lists/oss-security/2011/12/21/6
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=f26f9aff6aaf67e9a430d16c266f91b13a5bff64
- https://launchpad.net/bugs/cve/CVE-2011-4621
- http://git.kernel.org/linus/f26f9aff6aaf67e9a430d16c266f91b13a5bff64
- https://lkml.org/lkml/2010/11/20/212
- https://access.redhat.com/security/cve/CVE-2011-4621
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=812183
- https://security-tracker.debian.org/tracker/CVE-2011-4621
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-4621
- https://nvd.nist.gov/vuln/detail/CVE-2011-4621
- https://ubuntu.com/security/CVE-2011-4621
Frequently Asked Questions
What is the severity of CVE-2011-4621?
CVE-2011-4621 is classified as a High severity vulnerability due to its potential to cause a denial of service.
How do I fix CVE-2011-4621?
To fix CVE-2011-4621, upgrade to a kernel version later than 2.6.37 that addresses this vulnerability.
Who is affected by CVE-2011-4621?
CVE-2011-4621 affects unprivileged local users running vulnerable versions of the Linux kernel.
What type of attack does CVE-2011-4621 enable?
CVE-2011-4621 allows an unprivileged local user to execute a denial of service attack, potentially blocking critical kernel threads.
What is the impact of CVE-2011-4621 on system performance?
The impact of CVE-2011-4621 can lead to system stalls and degraded performance due to blocked kernel threads.
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