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Fencer Intel
medium 4.7

CVE-2015-4170 json

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 user…

published 2016-05-02 10 y ago modified 2026-06-17 4 mo ago also EUVD-2015-4193

cvss
4.7
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 25%
public exploits
0
none known

Summary

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.

Patch / fix

  • linux Debian 14, Debian 13, Debian 12 3.13.4-1

debian advisories DEBIAN-CVE-2015-4170

  • kernel RHEL 7 3.10.0-327.el7
  • perf RHEL 7 3.10.0-327.el7
  • python-perf RHEL 7 3.10.0-327.el7
  • kernel-kdump RHEL 7 3.10.0-327.el7
  • kernel-tools RHEL 7 3.10.0-327.el7
  • kernel-tools-libs RHEL 7 3.10.0-327.el7
  • kernel-bootwrapper RHEL 7 3.10.0-327.el7
  • kernel-abi-whitelists RHEL 7 3.10.0-327.el7

red hat advisories RHSA-2015:2152RHSA-2016:1395RHSA-2015:2411

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2015-4170 updated cvss 4.7

kernel: pty layer race condition on tty ldisc shutdown.

  • Red Hat Enterprise MRG 2 kernel-rt, mrg-rt-release, kernel-rt-trace, kernel-rt-vanilla, kernel-rt-firmware
    affected: no fix available
  • Red Hat Enterprise Linux Client (v. 7) perf 3.10.0-327.el7, kernel 3.10.0-327.el7, python-perf 3.10.0-327.el7, kernel-tools 3.10.0-327.el7, kernel-tools-libs 3.10.0-327.el7, kernel-abi-whitelists 3.10.0-327.el7, +1 more Red Hat Enterprise Linux Client Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-327.el7 Red Hat Enterprise Linux ComputeNode (v. 7) perf 3.10.0-327.el7, kernel 3.10.0-327.el7, python-perf 3.10.0-327.el7, kernel-tools 3.10.0-327.el7, kernel-tools-libs 3.10.0-327.el7, kernel-abi-whitelists 3.10.0-327.el7, +1 more
    fixed: vendor fix RHSA-2015:2152
  • Red Hat Enterprise Linux ComputeNode EUS (v. 7.1) perf 3.10.0-229.38.1.el7, kernel 3.10.0-229.38.1.el7, kernel-tools 3.10.0-229.38.1.el7, kernel-tools-libs 3.10.0-229.38.1.el7, kernel-abi-whitelists 3.10.0-229.38.1.el7, kernel-debuginfo-common-x86_64 3.10.0-229.38.1.el7
    fixed: vendor fix RHSA-2016:1395
  • Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-327.el7
    fixed: vendor fix RHSA-2015:2152
  • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.1) python-perf 3.10.0-229.38.1.el7, kernel-debuginfo-common-x86_64 3.10.0-229.38.1.el7
    fixed: vendor fix RHSA-2016:1395
  • Red Hat Enterprise Linux for Real Time (v. 7) kernel-rt 3.10.0-327.rt56.204.el7, kernel-rt-trace 3.10.0-327.rt56.204.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-327.rt56.204.el7
    fixed: vendor fix RHSA-2015:2411
  • Red Hat Enterprise Linux Server (v. 7) perf 3.10.0-327.el7, kernel 3.10.0-327.el7, python-perf 3.10.0-327.el7, kernel-kdump 3.10.0-327.el7, kernel-tools 3.10.0-327.el7, kernel-tools-libs 3.10.0-327.el7, +6 more
    fixed: vendor fix RHSA-2015:2152
  • Red Hat Enterprise Linux Server EUS (v. 7.1) perf 3.10.0-229.38.1.el7, kernel 3.10.0-229.38.1.el7, perf 3.10.0-229.38.1.ael7b, kernel 3.10.0-229.38.1.ael7b, kernel-kdump 3.10.0-229.38.1.el7, kernel-tools 3.10.0-229.38.1.el7, +11 more
    fixed: vendor fix RHSA-2016:1395
show 4 more
  • Red Hat Enterprise Linux Server Optional (v. 7) kernel-debuginfo-common-ppc64 3.10.0-327.el7, kernel-debuginfo-common-x86_64 3.10.0-327.el7, kernel-debuginfo-common-ppc64le 3.10.0-327.el7
    fixed: vendor fix RHSA-2015:2152
  • Red Hat Enterprise Linux Server Optional EUS (v. 7.1) python-perf 3.10.0-229.38.1.el7, python-perf 3.10.0-229.38.1.ael7b, kernel-debuginfo-common-ppc64 3.10.0-229.38.1.el7, kernel-debuginfo-common-s390x 3.10.0-229.38.1.el7, kernel-debuginfo-common-x86_64 3.10.0-229.38.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-229.38.1.ael7b
    fixed: vendor fix RHSA-2016:1395
  • Red Hat Enterprise Linux Workstation (v. 7) perf 3.10.0-327.el7, kernel 3.10.0-327.el7, python-perf 3.10.0-327.el7, kernel-tools 3.10.0-327.el7, kernel-tools-libs 3.10.0-327.el7, kernel-abi-whitelists 3.10.0-327.el7, +1 more Red Hat Enterprise Linux Workstation Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-327.el7
    fixed: vendor fix RHSA-2015:2152
  • Red Hat Enterprise Linux 4 kernel Red Hat Enterprise Linux 5 kernel Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, python-perf, kernel-tools, kernel-aarch64, kernel-tools-libs
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.33% chance of exploitation in the next 30 days, higher than 25% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 4.7 CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 2.0 4.7 AV:L/AC:M/Au:N/C:N/I:N/A:C

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.