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TI-2017-01886 Aliases CVE-2017-2636GHSA-gxfh-c6q2-wcm7

Race condition in drivers/tty/n_hdlc.c in the Linux kernel through 4.10.1 allows local…

Priority LOW 33CWE-362Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
High
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-415 and the CVSS impact.

Summary

Race condition in drivers/tty/n_hdlc.c in the Linux kernel through 4.10.1 allows local users to gain privileges or cause a denial of service (double free) by setting the HDLC line discipline.

Why it matters now

EPSS 0.01029 63rd percentileScored 2026-11-07
Fix Fixed Red Hat: 10 advisories

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*2.6.31 to before 3.2.87; 3.3 to before 3.10.106; 3.11 to before 3.12.72; 3.13 to before 3.16.42; 3.17 to before 3.18.49; 3.19 to before 4.1.49; 4.2 to before 4.4.54; 4.5 to before 4.9.15; 4.10 to before 4.10.3VulnerableLinux
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*8.0VulnerableDebian
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 2.6.31 to before 3.2.87; 3.3 to before 3.10.106; 3.11 to before 3.12.72; 3.13 to before 3.16.42; 3.17 to before 3.18.49; 3.19 to before 4.1.49; 4.2 to before 4.4.54; 4.5 to before 4.9.15; 4.10 to before 4.10.3 Vulnerable ·Linux
  • cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Debian

Remediation

Red Hat 10 advisories

  • RHSA-2017:1488 Released 2017-06-19 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux Server AUS (v. 6.6) kernel-2.6.32-504.60.2.el6, kernel-abi-whitelists-2.6.32-504.60.2.el6, kernel-debug-2.6.32-504.60.2.el6 +6
    • Red Hat Enterprise Linux Server Optional AUS (v. 6.6) python-perf-2.6.32-504.60.2.el6
    • Red Hat Enterprise Linux Server Optional TUS (v. 6.6) python-perf-2.6.32-504.60.2.el6
    • Red Hat Enterprise Linux Server TUS (v. 6.6) kernel-2.6.32-504.60.2.el6, kernel-abi-whitelists-2.6.32-504.60.2.el6, kernel-debug-2.6.32-504.60.2.el6 +6
  • RHSA-2017:1233 Released 2017-05-16 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux HPC Node EUS (v. 6.7) kernel-2.6.32-573.42.1.el6, kernel-abi-whitelists-2.6.32-573.42.1.el6, kernel-debug-2.6.32-573.42.1.el6 +6
    • Red Hat Enterprise Linux HPC Node Optional EUS (v. 6.7) python-perf-2.6.32-573.42.1.el6
    • Red Hat Enterprise Linux Server EUS (v. 6.7) kernel-2.6.32-573.42.1.el6, kernel-abi-whitelists-2.6.32-573.42.1.el6, kernel-bootwrapper-2.6.32-573.42.1.el6 +9
    • Red Hat Enterprise Linux Server Optional EUS (v. 6.7) python-perf-2.6.32-573.42.1.el6
  • RHSA-2017:1232 Released 2017-05-16 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux Server AUS (v. 6.5) kernel-2.6.32-431.80.1.el6, kernel-abi-whitelists-2.6.32-431.80.1.el6, kernel-debug-2.6.32-431.80.1.el6 +6
    • Red Hat Enterprise Linux Server Optional AUS (v. 6.5) kernel-2.6.32-431.80.1.el6, python-perf-2.6.32-431.80.1.el6
    • Red Hat Enterprise Linux Server Optional TUS (v. 6.5) kernel-2.6.32-431.80.1.el6, python-perf-2.6.32-431.80.1.el6
    • Red Hat Enterprise Linux Server TUS (v. 6.5) kernel-2.6.32-431.80.1.el6, kernel-abi-whitelists-2.6.32-431.80.1.el6, kernel-debug-2.6.32-431.80.1.el6 +6
Show 7 more Red Hat advisories
  • RHSA-2017:1125 Released 2017-04-25 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux ComputeNode EUS (v. 7.2) kernel-3.10.0-327.53.1.el7, kernel-abi-whitelists-3.10.0-327.53.1.el7, kernel-debug-3.10.0-327.53.1.el7 +8
    • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.2) kernel-tools-libs-devel-3.10.0-327.53.1.el7
    • Red Hat Enterprise Linux Server EUS (v. 7.2) kernel-3.10.0-327.53.1.el7, kernel-abi-whitelists-3.10.0-327.53.1.el7, kernel-bootwrapper-3.10.0-327.53.1.el7 +11
    • Red Hat Enterprise Linux Server Optional EUS (v. 7.2) kernel-debug-devel-3.10.0-327.53.1.el7, kernel-tools-libs-devel-3.10.0-327.53.1.el7
  • RHSA-2017:1126 Released 2017-04-25 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux Server AUS (v. 6.2) kernel-2.6.32-220.71.1.el6, kernel-debug-2.6.32-220.71.1.el6, kernel-debug-devel-2.6.32-220.71.1.el6 +5
    • Red Hat Enterprise Linux Server Optional AUS (v. 6.2) kernel-2.6.32-220.71.1.el6, python-perf-2.6.32-220.71.1.el6
  • RHSA-2017:0986 Released 2017-04-18 · Red Hat rating Important
    kernel security update
    • Red Hat Enterprise Linux Server AUS (v. 6.4) kernel-2.6.32-358.78.1.el6, kernel-debug-2.6.32-358.78.1.el6, kernel-debug-devel-2.6.32-358.78.1.el6 +5
    • Red Hat Enterprise Linux Server Optional AUS (v. 6.4) kernel-2.6.32-358.78.1.el6, python-perf-2.6.32-358.78.1.el6
  • RHSA-2017:0933 Released 2017-04-12 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat Enterprise Linux Client (v. 7) kernel-3.10.0-514.16.1.el7, kernel-abi-whitelists-3.10.0-514.16.1.el7, kernel-debug-3.10.0-514.16.1.el7 +8
    • Red Hat Enterprise Linux Client Optional (v. 7) kernel-tools-libs-devel-3.10.0-514.16.1.el7
    • Red Hat Enterprise Linux ComputeNode (v. 7) kernel-3.10.0-514.16.1.el7, kernel-abi-whitelists-3.10.0-514.16.1.el7, kernel-debug-3.10.0-514.16.1.el7 +8
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-tools-libs-devel-3.10.0-514.16.1.el7
    • Red Hat Enterprise Linux Server (v. 7) kernel-3.10.0-514.16.1.el7, kernel-abi-whitelists-3.10.0-514.16.1.el7, kernel-bootwrapper-3.10.0-514.16.1.el7 +11
    • Red Hat Enterprise Linux Server Optional (v. 7) kernel-debug-devel-3.10.0-514.16.1.el7, kernel-tools-libs-devel-3.10.0-514.16.1.el7
    • Red Hat Enterprise Linux Workstation (v. 7) kernel-3.10.0-514.16.1.el7, kernel-abi-whitelists-3.10.0-514.16.1.el7, kernel-debug-3.10.0-514.16.1.el7 +8
    • Red Hat Enterprise Linux Workstation Optional (v. 7) kernel-tools-libs-devel-3.10.0-514.16.1.el7
  • RHSA-2017:0931 Released 2017-04-12 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux Realtime (v. 7) kernel-rt-3.10.0-514.16.1.rt56.437.el7, kernel-rt-debug-3.10.0-514.16.1.rt56.437.el7, kernel-rt-debug-devel-3.10.0-514.16.1.rt56.437.el7 +4
    • Red Hat Enterprise Linux for Real Time for NFV (v. 7) kernel-rt-3.10.0-514.16.1.rt56.437.el7, kernel-rt-debug-3.10.0-514.16.1.rt56.437.el7, kernel-rt-debug-devel-3.10.0-514.16.1.rt56.437.el7 +7
  • RHSA-2017:0932 Released 2017-04-12 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat MRG Realtime for RHEL 6 Server v.2 kernel-rt-1:3.10.0-514.rt56.219.el6rt, kernel-rt-debug-1:3.10.0-514.rt56.219.el6rt, kernel-rt-debug-devel-1:3.10.0-514.rt56.219.el6rt +7
  • RHSA-2017:0892 Released 2017-04-11 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux Desktop (v. 6) kernel-2.6.32-696.1.1.el6, kernel-abi-whitelists-2.6.32-696.1.1.el6, kernel-debug-2.6.32-696.1.1.el6 +6
    • Red Hat Enterprise Linux Desktop Optional (v. 6) python-perf-2.6.32-696.1.1.el6
    • Red Hat Enterprise Linux HPC Node (v. 6) kernel-2.6.32-696.1.1.el6, kernel-abi-whitelists-2.6.32-696.1.1.el6, kernel-debug-2.6.32-696.1.1.el6 +6
    • Red Hat Enterprise Linux HPC Node Optional (v. 6) python-perf-2.6.32-696.1.1.el6
    • Red Hat Enterprise Linux Server (v. 6) kernel-2.6.32-696.1.1.el6, kernel-abi-whitelists-2.6.32-696.1.1.el6, kernel-bootwrapper-2.6.32-696.1.1.el6 +9
    • Red Hat Enterprise Linux Server Optional (v. 6) python-perf-2.6.32-696.1.1.el6
    • Red Hat Enterprise Linux Workstation (v. 6) kernel-2.6.32-696.1.1.el6, kernel-abi-whitelists-2.6.32-696.1.1.el6, kernel-debug-2.6.32-696.1.1.el6 +6
    • Red Hat Enterprise Linux Workstation Optional (v. 6) python-perf-2.6.32-696.1.1.el6

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2017:0933
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2017:0933
Red Hat Enterprise Linux ComputeNode (v. 7)Fixed RHSA-2017:0933
Red Hat Enterprise Linux ComputeNode EUS (v. 7.2)Fixed RHSA-2017:1125
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2017:0933
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.2)Fixed RHSA-2017:1125
Red Hat Enterprise Linux Desktop (v. 6)Fixed RHSA-2017:0892
Red Hat Enterprise Linux Desktop Optional (v. 6)Fixed RHSA-2017:0892
Red Hat Enterprise Linux HPC Node (v. 6)Fixed RHSA-2017:0892
Red Hat Enterprise Linux HPC Node EUS (v. 6.7)Fixed RHSA-2017:1233
Red Hat Enterprise Linux HPC Node Optional (v. 6)Fixed RHSA-2017:0892
Red Hat Enterprise Linux HPC Node Optional EUS (v. 6.7)Fixed RHSA-2017:1233
Red Hat Enterprise Linux Realtime (v. 7)Fixed RHSA-2017:0931
Red Hat Enterprise Linux Server (v. 6)Fixed RHSA-2017:0892
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2017:0933
Red Hat Enterprise Linux Server AUS (v. 6.2)Fixed RHSA-2017:1126
Red Hat Enterprise Linux Server AUS (v. 6.4)Fixed RHSA-2017:0986
Red Hat Enterprise Linux Server AUS (v. 6.5)Fixed RHSA-2017:1232
Red Hat Enterprise Linux Server AUS (v. 6.6)Fixed RHSA-2017:1488
Red Hat Enterprise Linux Server EUS (v. 6.7)Fixed RHSA-2017:1233
Red Hat Enterprise Linux Server EUS (v. 7.2)Fixed RHSA-2017:1125
Red Hat Enterprise Linux Server Optional (v. 6)Fixed RHSA-2017:0892
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2017:0933
Red Hat Enterprise Linux Server Optional AUS (v. 6.2)Fixed RHSA-2017:1126
Red Hat Enterprise Linux Server Optional AUS (v. 6.4)Fixed RHSA-2017:0986
Red Hat Enterprise Linux Server Optional AUS (v. 6.5)Fixed RHSA-2017:1232
Red Hat Enterprise Linux Server Optional AUS (v. 6.6)Fixed RHSA-2017:1488
Red Hat Enterprise Linux Server Optional EUS (v. 6.7)Fixed RHSA-2017:1233
Red Hat Enterprise Linux Server Optional EUS (v. 7.2)Fixed RHSA-2017:1125
Red Hat Enterprise Linux Server Optional TUS (v. 6.5)Fixed RHSA-2017:1232
Red Hat Enterprise Linux Server Optional TUS (v. 6.6)Fixed RHSA-2017:1488
Red Hat Enterprise Linux Server TUS (v. 6.5)Fixed RHSA-2017:1232
Red Hat Enterprise Linux Server TUS (v. 6.6)Fixed RHSA-2017:1488
Red Hat Enterprise Linux Workstation (v. 6)Fixed RHSA-2017:0892
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2017:0933
Red Hat Enterprise Linux Workstation Optional (v. 6)Fixed RHSA-2017:0892
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2017:0933
Red Hat Enterprise Linux for Real Time for NFV (v. 7)Fixed RHSA-2017:0931
Red Hat MRG Realtime for RHEL 6 Server v.2Fixed RHSA-2017:0932
Not affected: 1 product
  • Red Hat Enterprise Linux 5

Timeline

  1. 2026-10-02 Threatist record created from CVE-2017-2636
  2. 2026-10-03 Alias added: GHSA-gxfh-c6q2-wcm7

References

Patch 1

Advisory 13

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences