CVE-2011-2183: Null Pointer Dereference
First published: Fri Jun 03 2011(Updated: )
Andrea Righi reported a case where an exiting task can race against ksmd. ksm_scan.mm_slot == the only registered mm CPU 1 (bug program) CPU 2 (ksmd) list_empty() is false lock ksm_scan.mm_slot list_del unlock slot == &ksm_mm_head (but list is now empty_) Close this race by revalidating that the new slot is not simply the list head again. Reproducer: <a href="http://www.spinics.net/lists/linux-mm/msg20233.html">http://www.spinics.net/lists/linux-mm/msg20233.html</a> Proposed patch: <a href="http://www.spinics.net/lists/linux-mm/msg20301.html">http://www.spinics.net/lists/linux-mm/msg20301.html</a> Acknowledgements: Red Hat would like to thank Andrea Righi for reporting this issue.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | =2.6.39-rc7 | |
| Linux Linux kernel | <=2.6.39.2 | |
| Linux Linux kernel | =2.6.39-rc6 | |
| Linux Linux kernel | =2.6.39-rc4 | |
| Linux Linux kernel | =2.6.39.1 | |
| Linux Linux kernel | =2.6.39-rc1 | |
| Linux Linux kernel | =2.6.39-rc3 | |
| Linux Linux kernel | =2.6.39 | |
| Linux Linux kernel | =2.6.39-rc2 | |
| Linux Linux kernel | =2.6.39-rc5 | |
| debian/linux-2.6 |
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Reference Links
- https://github.com/torvalds/linux/commit/2b472611a32a72f4a118c069c2d62a1a3f087afd
- https://bugzilla.redhat.com/show_bug.cgi?id=710338
- http://www.openwall.com/lists/oss-security/2011/06/06/1
- http://ftp.osuosl.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39.3
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=2b472611a32a72f4a118c069c2d62a1a3f087afd
- https://launchpad.net/bugs/cve/CVE-2011-2183
- http://www.spinics.net/lists/linux-mm/msg20233.html
- http://www.spinics.net/lists/linux-mm/msg20301.html
- https://rhn.redhat.com/errata/RHSA-2011-1189.html
- http://git.kernel.org/linus/2b472611a32a72f4a118c069c2d62a1a3f087afd
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=719238
- https://rhn.redhat.com/errata/RHSA-2011-1253.html
- https://security-tracker.debian.org/tracker/CVE-2011-2183
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-2183
- https://nvd.nist.gov/vuln/detail/CVE-2011-2183
- https://ubuntu.com/security/CVE-2011-2183
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