CVE-2014-0100: Race Condition
First published: Thu Feb 27 2014(Updated: )
Description of the problem: A very subtle race condition between inet_frag_evictor, inet_frag_intern and the IPv4/6 frag_queue and expire functions (basically the users of inet_frag_kill/inet_frag_put) was found. What happens is that after a fragment has been added to the hash chain but before it's been added to the lru_list (inet_frag_lru_add), it may get deleted (either by an expired timer if the system load is high or the timer sufficiently low, or by the fraq_queue function for different reasons) before it's added to the lru_list, then after it gets added it's a matter of time for the evictor to get to a piece of memory which has been freed leading to a number of different bugs depending on what's left there. Introduced by: <a href="http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=3ef0eb0d">http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=3ef0eb0d</a> Acknowledgements: This issue was discovered by Nikolay Aleksandrov of Red Hat.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=3.9<3.10.37 | |
| Linux Linux kernel | >=3.11<3.12.18 | |
| Linux Linux kernel | >=3.13<3.13.10 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.11.10-1 6.12.5-1 |
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Reference Links
- http://patchwork.ozlabs.org/patch/325844/
- http://www.openwall.com/lists/oss-security/2014/03/04/4
- https://bugzilla.redhat.com/show_bug.cgi?id=1070618
- https://launchpad.net/bugs/cve/CVE-2014-0100
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=3ef0eb0d
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1072026
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=24b9bf43e93e0edd89072da51cf1fab95fc69dec
- https://rhn.redhat.com/errata/RHSA-2014-0557.html
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=3ef0eb0db4bf92c6d2510fe5c4dc51852746f206
- https://security-tracker.debian.org/tracker/CVE-2014-0100
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-0100
- https://nvd.nist.gov/vuln/detail/CVE-2014-0100
- https://ubuntu.com/security/CVE-2014-0100
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