CVE-2015-4170

Severity: medium (CVSS 4.7 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2016-05-02 · updated 2026-06-17
Weakness: CWE-362

Description

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.

Affected products

Linux kernel: through 3.13.3
RedHat 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

References

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://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

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