{"id":"CVE-2015-4170","aliases":["DEBIAN-CVE-2015-4170","EUVD-2015-4193","GHSA-mqxq-v3w5-xvj4","RHSA-2015:2152","RHSA-2015:2411","RHSA-2016:1395","UBUNTU-CVE-2015-4170"],"status":"published","title":"Race condition in the ldsem_cmpxchg function in drivers/tty/tty_ldsem.c in the Linux kernel...","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.","severity":{"version":"3.0","score":4.7,"vector":"CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.00326,"percentile":0.2584,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-362"],"published":"2016-05-02T10:00:00Z","modified":"2026-09-09T07:00:59Z","fixes":[{"ecosystem":"Debian:12","package":"linux","fixed_in":["3.13.4-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"linux","fixed_in":["3.13.4-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"linux","fixed_in":["3.13.4-1"],"sources":["osv"]},{"ecosystem":"Red Hat:rhel_eus:7.1::computenode","package":"kernel","fixed_in":["0:3.10.0-229.38.1.el7"],"sources":["osv"]},{"ecosystem":"Red Hat:rhel_eus:7.1::computenode","package":"kernel-abi-whitelists","fixed_in":["0:3.10.0-229.38.1.el7"],"sources":["osv"]},{"ecosystem":"Red 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