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Vulnerability record · CVE-2015-4170 · published 2 May 2016

CVE-2015-4170: Linux kernel race condition vulnerability

Linux · Linux Kernel

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.

4.7 CVSS 3.0 Medium EPSS 0.33% · top 76.9% CWE-362 · Race condition
4.7CVSS 3.0 base score, v2 4.7
0.33%EPSS exploitation probability, 30 days
NoNot in CISA KEV
6Affected product versions listed by NVD
16References
17 Jun 2026Last modified by NVD

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.

CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected products

6 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cf872776fc84128bb779ce2b83a37c884c3203ae Vendor Advisory
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 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1218879 Issue TrackingVDB Entry
https://github.com/torvalds/linux/commit/cf872776fc84128bb779ce2b83a37c884c3203ae
https://www.kernel.org/pub/linux/kernel/next/patch-v3.13-rc4-next-20131218.xz Patch
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cf872776fc84128bb779ce2b83a37c884c3203ae Vendor Advisory
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 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1218879 Issue TrackingVDB Entry
https://github.com/torvalds/linux/commit/cf872776fc84128bb779ce2b83a37c884c3203ae
https://www.kernel.org/pub/linux/kernel/next/patch-v3.13-rc4-next-20131218.xz Patch

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Source: NIST National Vulnerability Database (record CVE-2015-4170), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.