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Fencer Vulns
high 7.8

CVE-2019-15239 json

In the Linux kernel, a certain net/ipv4/tcp_output.c change, which was properly incorporated into 4.16.12, was incorrectly backported to th…

published 2019-08-20 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-6250

cvss
7.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits
0
none known

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.

Patch / fix

  • linux Debian 14, Debian 13, Debian 12 4.15.4-1

debian advisories DEBIAN-CVE-2019-15239

  • linux Ubuntu 16.04 LTS 4.4.0-165.193
  • linux-aws Ubuntu 16.04 LTS 4.4.0-1095.106
  • linux-kvm Ubuntu 16.04 LTS 4.4.0-1059.66
  • linux-raspi2 Ubuntu 16.04 LTS 4.4.0-1123.132
  • linux-snapdragon Ubuntu 16.04 LTS 4.4.0-1127.135
  • linux-aws Ubuntu Pro 14.04 LTS 4.4.0-1055.59
  • linux-fips Ubuntu Pro FIPS-updates 16.04 LTS 4.4.0-1022.27
  • linux-lts-xenial Ubuntu Pro 14.04 LTS 4.4.0-165.193~14.04.1

ubuntu advisories UBUNTU-CVE-2019-15239

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel RHEL 7 3.10.0-1062.7.1.el7
  • perf RHEL 7 3.10.0-1062.7.1.el7
  • bpftool RHEL 7 3.10.0-1062.7.1.el7
  • python-perf RHEL 7 3.10.0-1062.7.1.el7
  • kernel-kdump RHEL 7 3.10.0-1062.7.1.el7
  • kernel-tools RHEL 7 3.10.0-1062.7.1.el7
  • kernel-tools-libs RHEL 7 3.10.0-1062.7.1.el7
  • kernel-bootwrapper RHEL 7 3.10.0-1062.7.1.el7

red hat advisories RHSA-2019:3979RHSA-2019:3978RHSA-2020:0027

  • kernel-syms SLES for SAP 12 SP3, SLES 12 SP3-LTSS, SLES 12 SP3-BCL +4 more 4.4.180-94.107.1
  • kernel-source SLES for SAP 12 SP3, SLES 12 SP3-LTSS, SLES 12 SP3-BCL +4 more 4.4.180-94.107.1
  • kernel-default SLES for SAP 12 SP3, SLES 12 SP3-LTSS, SLES 12 SP3-BCL +5 more 4.4.180-94.107.1
  • kgraft-patch-SLE12-SP3_Update_29 SLES for SAP 12 SP3, SLES 12 SP3-LTSS, OpenStack Cloud Crowbar 8 +3 more 1-4.3.1
  • kernel-rt SLE Real Time 12 SP4 4.12.14-8.6.1
  • kernel-syms-rt SLE Real Time 12 SP4 4.12.14-8.6.1
  • kernel-rt_debug SLE Real Time 12 SP4 4.12.14-8.6.1
  • kernel-source-rt SLE Real Time 12 SP4 4.12.14-8.6.1

suse advisories SUSE-SU-2019:3258-1SUSE-SU-2019:3249-1SUSE-SU-2019:3230-1SUSE-SU-2019:3228-1SUSE-SU-2019:3215-1SUSE-SU-2019:2949-1

  • kernel-syms openSUSE Leap 15.1 4.12.14-lp151.28.16.1
  • kernel-obs-qa openSUSE Leap 15.1 4.12.14-lp151.28.16.1
  • kernel-source openSUSE Leap 15.1 4.12.14-lp151.28.16.1
  • kernel-default openSUSE Leap 15.1 4.12.14-lp151.28.16.1
  • kernel-vanilla openSUSE Leap 15.1 4.12.14-lp151.28.16.1
  • kernel-kvmsmall openSUSE Leap 15.1 4.12.14-lp151.28.16.1
  • kernel-obs-build openSUSE Leap 15.1 4.12.14-lp151.28.16.1
  • kernel-syms openSUSE Leap 15.0 4.12.14-lp150.12.73.1

opensuse advisories openSUSE-SU-2019:2181-1openSUSE-SU-2019:2173-1

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-2019-15239 updated cvss 7.4

kernel: local attacker can trigger multiple use-after-free conditions results in privilege escalation

  • Red Hat Enterprise Linux Client (v. 7) perf 3.10.0-1062.7.1.el7, kernel 3.10.0-1062.7.1.el7, bpftool 3.10.0-1062.7.1.el7, python-perf 3.10.0-1062.7.1.el7, kernel-tools 3.10.0-1062.7.1.el7, kernel-tools-libs 3.10.0-1062.7.1.el7, +2 more Red Hat Enterprise Linux Client Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1062.7.1.el7 Red Hat Enterprise Linux ComputeNode (v. 7) perf 3.10.0-1062.7.1.el7, kernel 3.10.0-1062.7.1.el7, bpftool 3.10.0-1062.7.1.el7, python-perf 3.10.0-1062.7.1.el7, kernel-tools 3.10.0-1062.7.1.el7, kernel-tools-libs 3.10.0-1062.7.1.el7, +2 more Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1062.7.1.el7
    fixed: vendor fix RHSA-2019:3979
  • Red Hat Enterprise Linux for Real Time for NFV (v. 7) kernel-rt 3.10.0-1062.7.1.rt56.1030.el7, kernel-rt-kvm 3.10.0-1062.7.1.rt56.1030.el7, kernel-rt-trace 3.10.0-1062.7.1.rt56.1030.el7, kernel-rt-debug-kvm 3.10.0-1062.7.1.rt56.1030.el7, kernel-rt-trace-kvm 3.10.0-1062.7.1.rt56.1030.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-1062.7.1.rt56.1030.el7 Red Hat Enterprise Linux Realtime (v. 7) kernel-rt 3.10.0-1062.7.1.rt56.1030.el7, kernel-rt-trace 3.10.0-1062.7.1.rt56.1030.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-1062.7.1.rt56.1030.el7
    fixed: vendor fix RHSA-2019:3978
  • Red Hat Enterprise Linux Server (v. 7) perf 3.10.0-1062.7.1.el7, kernel 3.10.0-1062.7.1.el7, bpftool 3.10.0-1062.7.1.el7, python-perf 3.10.0-1062.7.1.el7, kernel-kdump 3.10.0-1062.7.1.el7, kernel-tools 3.10.0-1062.7.1.el7, +13 more Red Hat Enterprise Linux Server Optional (v. 7) kernel-debuginfo-common-ppc64 3.10.0-1062.7.1.el7, kernel-debuginfo-common-x86_64 3.10.0-1062.7.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-1062.7.1.el7 Red Hat Enterprise Linux Workstation (v. 7) perf 3.10.0-1062.7.1.el7, kernel 3.10.0-1062.7.1.el7, bpftool 3.10.0-1062.7.1.el7, python-perf 3.10.0-1062.7.1.el7, kernel-tools 3.10.0-1062.7.1.el7, kernel-tools-libs 3.10.0-1062.7.1.el7, +2 more Red Hat Enterprise Linux Workstation Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-1062.7.1.el7
    fixed: vendor fix RHSA-2019:3979
  • 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, kernel-alt, python-perf, kernel-kdump, kernel-tools, +3 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise MRG 2 kernel-rt, mrg-rt-release, kernel-rt-trace, kernel-rt-vanilla, kernel-rt-firmware
    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

0.59% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • pulsesecurity.co.nz https://pulsesecurity.co.nz/advisories/linux-kernel-4.9-tcpsocketsuaf referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 7.8 CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.2 AV:L/AC:L/Au:N/C:C/I:C/A:C

Classification

Weakness
Technology feeds

References

Sources

Fencer Vulns 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.