Description
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.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 4.15.4-1 | — |
| Debian 13 | linux | 4.15.4-1 | — |
| Debian 12 | linux | 4.15.4-1 | — |
| Debian 9 | linux | 4.9.168-1+deb9u5 | DSA-4497-1 |
| Debian 8 | linux | 3.16.72-1 | DLA-1884-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | linux-vmware | No fix yet | — |
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv +2 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gke +3 | No fix yet | — |
| Ubuntu 16.04 LTS | linux | 4.4.0-165.193 | — |
| Ubuntu 16.04 LTS | linux-aws | 4.4.0-1095.106 | — |
| Ubuntu 16.04 LTS | linux-kvm | 4.4.0-1059.66 | — |
| Ubuntu 16.04 LTS | linux-raspi2 | 4.4.0-1123.132 | — |
| Ubuntu 16.04 LTS | linux-snapdragon | 4.4.0-1127.135 | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro FIPS 16.04 LTS | linux-fips | No fix yet | — |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | 4.4.0-1022.27 | — |
| Ubuntu Pro 14.04 LTS | linux-aws | 4.4.0-1055.59 | — |
| Ubuntu Pro 14.04 LTS | linux-lts-xenial | 4.4.0-165.193~14.04.1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | kernel-rt +10 | 3.10.0-1062.7.1.rt56.1030.el7 | RHSA-2019:3978 |
| RHEL 7 | kpatch-patch-3_10_0-1062 | 1-11.el7 | RHSA-2020:0027 |
| RHEL 7 | kpatch-patch-3_10_0-1062_1_1 | 1-10.el7 | RHSA-2020:0027 |
| RHEL 7 | kpatch-patch-3_10_0-1062_1_2 | 1-9.el7 | RHSA-2020:0027 |
| RHEL 7 | kpatch-patch-3_10_0-1062_4_1 | 1-6.el7 | RHSA-2020:0027 |
| RHEL 7 | kpatch-patch-3_10_0-1062_4_2 +1 | 1-3.el7 | RHSA-2020:0027 |
| RHEL 7 | perf +18 | 3.10.0-1062.7.1.el7 | RHSA-2019:3979 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | kernel-azure +2 | 4.12.14-8.16.1 | SUSE-SU-2019:2658-1 |
| SLES 15 SP1 | kernel-docs +5 | 4.12.14-197.18.1 | SUSE-SU-2019:2424-1 |
| SLES 15 | kernel-azure +2 | 4.12.14-5.41.1 | SUSE-SU-2019:2651-1 |
| SLES 15 | kernel-docs +6 | 4.12.14-150.35.1 | SUSE-SU-2019:2414-1 |
| SLES 12 SP4 | kernel-azure +2 | 4.12.14-6.26.1 | SUSE-SU-2019:2648-1 |
| SLES 12 SP4 | kernel-docs +4 | 4.12.14-95.32.1 | SUSE-SU-2019:2412-1 |
| SLES 12 SP3 | kernel-syms +2 | 4.4.180-94.107.1 | SUSE-SU-2019:2949-1 |
| SLES 12 SP3 | kgraft-patch-SLE12-SP3_Update_23 | 7-2.5 | SUSE-SU-2019:3258-1 |
| SLES 12 SP3 | kgraft-patch-SLE12-SP3_Update_24 +1 | 6-2.5 | SUSE-SU-2019:3258-1 |
| SLES 12 SP3 | kgraft-patch-SLE12-SP3_Update_26 | 6-2.1 | SUSE-SU-2019:3228-1 |
| SLES 12 SP3 | kgraft-patch-SLE12-SP3_Update_27 +1 | 4-2.1 | SUSE-SU-2019:3230-1, SUSE-SU-2019:3228-1 |
| SLES 12 SP3 | kgraft-patch-SLE12-SP3_Update_29 | 1-4.3.1 | SUSE-SU-2019:2949-1 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP4 | kernel-azure +2 | 4.12.14-6.26.1 | SUSE-SU-2019:2648-1 |
| SLES for SAP 12 SP4 | kernel-syms +2 | 4.12.14-95.32.1 | SUSE-SU-2019:2412-1 |
| SLES for SAP 12 SP3 | kernel-syms +2 | 4.4.180-94.107.1 | SUSE-SU-2019:2949-1 |
| SLES for SAP 12 SP3 | kgraft-patch-SLE12-SP3_Update_23 | 7-2.5 | SUSE-SU-2019:3258-1 |
| SLES for SAP 12 SP3 | kgraft-patch-SLE12-SP3_Update_24 +1 | 6-2.5 | SUSE-SU-2019:3258-1 |
| SLES for SAP 12 SP3 | kgraft-patch-SLE12-SP3_Update_26 | 6-2.1 | SUSE-SU-2019:3228-1 |
| SLES for SAP 12 SP3 | kgraft-patch-SLE12-SP3_Update_27 +1 | 4-2.1 | SUSE-SU-2019:3230-1, SUSE-SU-2019:3228-1 |
| SLES for SAP 12 SP3 | kgraft-patch-SLE12-SP3_Update_29 | 1-4.3.1 | SUSE-SU-2019:2949-1 |
| SLE Real Time 12 SP4 | kernel-rt +3 | 4.12.14-8.6.1 | SUSE-SU-2019:2756-1 |
| SLE Live Patching 15 SP1 | kernel-default | 4.12.14-197.18.1 | SUSE-SU-2019:2424-1 |
| SLE Live Patching 15 SP1 | kernel-livepatch-SLE15-SP1_Update_1 | 7-2.1 | SUSE-SU-2019:3249-1 |
| SLE Live Patching 15 SP1 | kernel-livepatch-SLE15-SP1_Update_2 | 6-2.1 | SUSE-SU-2019:3230-1 |
| SLE Live Patching 15 SP1 | kernel-livepatch-SLE15-SP1_Update_3 +1 | 4-2.1 | SUSE-SU-2019:3215-1 |
| SLE Live Patching 15 SP1 | kernel-livepatch-SLE15-SP1_Update_5 | 1-3.3.1 | SUSE-SU-2019:2424-1 |
| SLE Live Patching 15 | kernel-default | 4.12.14-150.35.1 | SUSE-SU-2019:2414-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_11 | 5-2.1 | SUSE-SU-2019:3249-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_12 +1 | 4-2.1 | SUSE-SU-2019:3215-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_14 | 1-1.3.1 | SUSE-SU-2019:2414-1 |
| SLE Live Patching 12 SP4 | kgraft-patch-SLE12-SP4_Update_5 | 5-2.1 | SUSE-SU-2019:3230-1 |
| SLE Live Patching 12 SP4 | kgraft-patch-SLE12-SP4_Update_6 +1 | 4-2.1 | SUSE-SU-2019:3249-1, SUSE-SU-2019:3215-1 |
| SLE Live Patching 12 SP4 | kgraft-patch-SLE12-SP4_Update_8 | 1-6.3.1 | SUSE-SU-2019:2412-1 |
| SUSE Real Time Module 15 SP1 | kernel-rt +3 | 4.12.14-14.11.1 | SUSE-SU-2019:2738-1 |
| SUSE OpenStack Cloud Crowbar 8 | kernel-syms +2 | 4.4.180-94.107.1 | SUSE-SU-2019:2949-1 |
| SUSE OpenStack Cloud Crowbar 8 | kgraft-patch-SLE12-SP3_Update_29 | 1-4.3.1 | SUSE-SU-2019:2949-1 |
| SUSE OpenStack Cloud 8 | kernel-syms +2 | 4.4.180-94.107.1 | SUSE-SU-2019:2949-1 |
| SUSE OpenStack Cloud 8 | kgraft-patch-SLE12-SP3_Update_29 | 1-4.3.1 | SUSE-SU-2019:2949-1 |
| SUSE HPE Helion OpenStack 8 | kernel-syms +2 | 4.4.180-94.107.1 | SUSE-SU-2019:2949-1 |
| SUSE HPE Helion OpenStack 8 | kgraft-patch-SLE12-SP3_Update_29 | 1-4.3.1 | SUSE-SU-2019:2949-1 |
| SUSE Enterprise Storage 5 | kernel-syms +2 | 4.4.180-94.107.1 | SUSE-SU-2019:2949-1 |
| SUSE Enterprise Storage 5 | kgraft-patch-SLE12-SP3_Update_29 | 1-4.3.1 | SUSE-SU-2019:2949-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.1 | kernel-docs +8 | 4.12.14-lp151.28.16.1 | openSUSE-SU-2019:2181-1 |
| openSUSE Leap 15.0 | kernel-docs +8 | 4.12.14-lp150.12.73.1 | openSUSE-SU-2019:2173-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | dtrace-modules-3.8.13-118.39.1.el6uek | 0.4.5-3.el6 | ELSA-2019-4810 |
| Oracle Linux 7 | dtrace-modules-3.8.13-118.39.1.el7uek | 0.4.5-3.el7 | ELSA-2019-4810 |
| Oracle Linux 7 | kernel-uek +5 | 3.8.13-118.39.1.el7uek | ELSA-2019-4810, ELSA-2019-4808 |
| Oracle Linux 7 | perf +12 | 3.10.0-1062.7.1.el7 | ELSA-2019-3979 |
Advisories 24
- RHSA-2019:3979 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Aug 26, 2026
- RHSA-2020:0027 Red Hat Security Advisory: kpatch-patch security update Red Hat Security Advisories (RHSA) · Aug 26, 2026
- RHSA-2019:3978 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Aug 26, 2026
- DSA-4497-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1884-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2019:3230-1 Security update for the Linux Kernel (Live Patch 28 for SLE 12 SP3) SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:2173-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:2756-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:3215-1 Security update for the Linux Kernel (Live Patch 4 for SLE 15 SP1) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:2949-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:2648-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:2414-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:3228-1 Security update for the Linux Kernel (Live Patch 27 for SLE 12 SP3) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:2412-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:2658-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:3258-1 Security update for the Linux Kernel (Live Patch 25 for SLE 12 SP3) SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:2651-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:3249-1 Security update for the Linux Kernel (Live Patch 1 for SLE 15 SP1) SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:2181-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 7, 2025
- SUSE-SU-2019:2424-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- SUSE-SU-2019:2738-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- ELSA-2019-3979 Important: kernel security and bug fix update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 26, 2019
- ELSA-2019-4810 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 2, 2019
- ELSA-2019-4808 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 1, 2019
References
- https://pulsesecurity.co.nz/advisories/linux-kernel-4.9-tcpsocketsuaf
- https://www.debian.org/security/2019/dsa-4497
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7f582b248d0a86bae5788c548d7bb5bca6f7691a
- https://lore.kernel.org/stable/41a61a2f87691d2bc839f26cdfe6f5ff2f51e472.camel%40decadent.org.uk/
- https://salsa.debian.org/kernel-team/kernel-sec/blob/f6273af2d956a87296b6b60379d0a186c9be4bbc/active/CVE-2019-15239
- openSUSE-SU-2019:2173 vendor-advisory
- openSUSE-SU-2019:2181 vendor-advisory
- RHSA-2019:3978 vendor-advisory
- RHSA-2019:3979 vendor-advisory
- RHSA-2020:0027 vendor-advisory