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TI-2019-11354 Aliases CVE-2019-15239GHSA-7j8w-38v5-7qqp

In the Linux kernel, a certain net/ipv4/tcp_output.c change, which was properly…

Priority LOW 35CWE-416Published · Updated

Key facts

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

Attack profile from CVSS 3.0 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.

Summary

In the Linux kernel, a certain net/ipv4/tcp_output.c change, which was properly incorporated into 4.16.12, was incorrectly backported to the earlier longterm kernels, introducing a new vulnerability that was potentially more severe than the issue that was intended to be fixed by backporting. Specifically, by adding to a write queue between disconnection and re-connection, a local attacker can trigger multiple use-after-free conditions. This can result in a kernel crash, or potentially in privilege escalation. NOTE: this affects (for example) Linux distributions that use 4.9.x longterm kernels before 4.9.190 or 4.14.x longterm kernels before 4.14.139.

Why it matters now

EPSS 0.00589 48th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed Red Hat: 3 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 · 3

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:4.16.12:*:*:*:*:*:*:*4.16.12VulnerableLinux
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*9.0VulnerableDebian
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*10.0VulnerableDebian
  • cpe:2.3:o:linux:linux_kernel:4.16.12:*:*:*:*:*:*:* Versions 4.16.12 Vulnerable ·Linux
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
  • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian

Remediation

Red Hat 3 advisories

  • RHSA-2020:0027 Released 2020-01-06 · Red Hat rating Important
    kpatch-patch security update
    • Red Hat Enterprise Linux Server (v. 7) kpatch-patch-3_10_0-1062-1-11.el7, kpatch-patch-3_10_0-1062_1_1-1-10.el7, kpatch-patch-3_10_0-1062_1_2-1-9.el7 +3
  • RHSA-2019:3978 Released 2019-11-26 · Red Hat rating Important
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux Realtime (v. 7) kernel-rt-3.10.0-1062.7.1.rt56.1030.el7, kernel-rt-debug-3.10.0-1062.7.1.rt56.1030.el7, kernel-rt-debug-devel-3.10.0-1062.7.1.rt56.1030.el7 +4
    • Red Hat Enterprise Linux for Real Time for NFV (v. 7) kernel-rt-3.10.0-1062.7.1.rt56.1030.el7, kernel-rt-debug-3.10.0-1062.7.1.rt56.1030.el7, kernel-rt-debug-devel-3.10.0-1062.7.1.rt56.1030.el7 +7
  • RHSA-2019:3979 Released 2019-11-26 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux Client (v. 7) bpftool-3.10.0-1062.7.1.el7, kernel-3.10.0-1062.7.1.el7, kernel-abi-whitelists-3.10.0-1062.7.1.el7 +8
    • Red Hat Enterprise Linux Client Optional (v. 7) kernel-tools-libs-devel-3.10.0-1062.7.1.el7
    • Red Hat Enterprise Linux ComputeNode (v. 7) bpftool-3.10.0-1062.7.1.el7, kernel-3.10.0-1062.7.1.el7, kernel-abi-whitelists-3.10.0-1062.7.1.el7 +8
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-tools-libs-devel-3.10.0-1062.7.1.el7
    • Red Hat Enterprise Linux Server (v. 7) bpftool-3.10.0-1062.7.1.el7, kernel-3.10.0-1062.7.1.el7, kernel-abi-whitelists-3.10.0-1062.7.1.el7 +11
    • Red Hat Enterprise Linux Server Optional (v. 7) kernel-debug-devel-3.10.0-1062.7.1.el7, kernel-tools-libs-devel-3.10.0-1062.7.1.el7
    • Red Hat Enterprise Linux Workstation (v. 7) bpftool-3.10.0-1062.7.1.el7, kernel-3.10.0-1062.7.1.el7, kernel-abi-whitelists-3.10.0-1062.7.1.el7 +8
    • Red Hat Enterprise Linux Workstation Optional (v. 7) kernel-tools-libs-devel-3.10.0-1062.7.1.el7

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-2019:3979
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2019:3979
Red Hat Enterprise Linux ComputeNode (v. 7)Fixed RHSA-2019:3979
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2019:3979
Red Hat Enterprise Linux Realtime (v. 7)Fixed RHSA-2019:3978
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2019:3979, RHSA-2020:0027
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2019:3979
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2019:3979
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2019:3979
Red Hat Enterprise Linux for Real Time for NFV (v. 7)Fixed RHSA-2019:3978
Not affected: 5 products
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise MRG 2

Timeline

  1. 2026-10-02 Threatist record created from CVE-2019-15239
  2. 2026-10-03 Alias added: GHSA-7j8w-38v5-7qqp

References

Exploit 1

Patch 1

Advisory 7

Other 1

Sources

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