CVE-2015-4170: Race Condition
First published: Wed May 06 2015(Updated: )
Race condition in the ldsem_cmpxchg function in drivers/tty/tty_ldsem.c in the Linux kernel before 3.13-rc4-next-20131218 allows local users to cause a denial of service (ldsem_down_read and ldsem_down_write deadlock) by establishing a new tty thread during shutdown of a previous tty thread.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux kernel | <=3.13.3 | |
| Red Hat Enterprise Linux Compute Node EUS | =7.1 | |
| redhat enterprise Linux for ibm z systems eus | =7.1_s390x | |
| redhat enterprise Linux for power big endian eus | =7.1_ppc64 | |
| redhat enterprise Linux for power little endian eus | =7.1_ppc64le | |
| redhat enterprise Linux server eus | =7.1 |
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Reference Links
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cf872776fc84128bb779ce2b83a37c884c3203ae
- http://www.openwall.com/lists/oss-security/2015/05/26/1
- http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
- http://www.securityfocus.com/bid/74820
- https://access.redhat.com/errata/RHSA-2016:1395
- https://bugzilla.redhat.com/show_bug.cgi?id=1218879
- https://github.com/torvalds/linux/commit/cf872776fc84128bb779ce2b83a37c884c3203ae
- https://www.kernel.org/pub/linux/kernel/next/patch-v3.13-rc4-next-20131218.xz
- http://seclists.org/oss-sec/2015/q2/545
- https://rhn.redhat.com/errata/RHSA-2015-2411.html
- https://rhn.redhat.com/errata/RHSA-2015-2152.html
Frequently Asked Questions
What is the severity of CVE-2015-4170?
CVE-2015-4170 has a medium severity rating due to its capability to cause a denial of service.
How do I fix CVE-2015-4170?
To mitigate CVE-2015-4170, it is recommended to update the Linux kernel to version 3.13.4 or later.
Which versions of the Linux kernel are affected by CVE-2015-4170?
CVE-2015-4170 affects Linux kernel versions prior to 3.13.4.
What type of attack does CVE-2015-4170 exploit?
CVE-2015-4170 exploits a race condition during the shutdown of tty threads.
Can local users exploit CVE-2015-4170?
Yes, local users can exploit CVE-2015-4170 to create a denial of service condition.
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- canonical/redhat enterprise linux for ibm z systems eus
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- canonical/redhat enterprise linux for power big endian eus
- version/redhat enterprise linux for power big endian eus/7.1_ppc64
- canonical/redhat enterprise linux for power little endian eus
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- canonical/redhat enterprise linux server eus
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