Description
In the Linux kernel, the following vulnerability has been resolved:
net: hso: fix NULL-deref on disconnect regression
Commit 8a12f8836145 ("net: hso: fix null-ptr-deref during tty device
unregistration") fixed the racy minor allocation reported by syzbot, but
introduced an unconditional NULL-pointer dereference on every disconnect
instead.
Specifically, the serial device table must no longer be accessed after
the minor has been released by hso_serial_tty_unregister().
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Linux | 4.19.187 – < 4.19.189, 5.4.112 – < 5.4.115, 5.10.30 – < 5.10.33, 5.11.14 – < 5.11.17, 5.12 | 4.19.189 |
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.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv +22 | No fix yet | — |
| Ubuntu 20.04 LTS | linux | 5.4.0-77.86 | — |
| Ubuntu 20.04 LTS | linux-aws +1 | 5.4.0-1051.53 | — |
| Ubuntu 20.04 LTS | linux-bluefield | 5.4.0-1013.16 | — |
| Ubuntu 20.04 LTS | linux-gcp | 5.4.0-1046.49 | — |
| Ubuntu 20.04 LTS | linux-gke +26 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gkeop | 5.4.0-1018.19 | — |
| Ubuntu 20.04 LTS | linux-kvm | 5.4.0-1041.42 | — |
| Ubuntu 20.04 LTS | linux-oracle | 5.4.0-1048.52 | — |
| Ubuntu 20.04 LTS | linux-raspi | 5.4.0-1038.41 | — |
| Ubuntu 18.04 LTS | linux | 4.15.0-147.151 | — |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1106.113 | — |
| Ubuntu 18.04 LTS | linux-aws-5.4 +1 | 5.4.0-1051.53~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-azure-4.15 | 4.15.0-1118.131 | — |
| Ubuntu 18.04 LTS | linux-gcp +13 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp-4.15 | 4.15.0-1103.116 | — |
| Ubuntu 18.04 LTS | linux-gcp-5.4 | 5.4.0-1046.49~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-hwe-5.4 | 5.4.0-77.86~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1094.96 | — |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1075.83 | — |
| Ubuntu 18.04 LTS | linux-oracle-5.4 | 5.4.0-1048.52~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-raspi-5.4 | 5.4.0-1038.41~18.04.1 | — |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-fips | 5.4.0-1028.32 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-aws-fips | 4.15.0-2048.50 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-azure-fips | 4.15.0-2030.33 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-fips | 4.15.0-1063.71 | — |
| Ubuntu Pro 16.04 LTS | linux-aws-hwe | 4.15.0-1106.113~16.04.1 | — |
| Ubuntu Pro 16.04 LTS | linux-azure | 4.15.0-1118.131~16.04.1 | — |
| Ubuntu Pro 16.04 LTS | linux-gcp | 4.15.0-1103.116~16.04.1 | — |
| Ubuntu Pro 16.04 LTS | linux-hwe | 4.15.0-147.151~16.04.1 | — |
| Ubuntu Pro 16.04 LTS | linux-oracle | 4.15.0-1075.83~16.04.1 | — |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1118.131~14.04.1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | kernel-rt +12 | 4.18.0-348.rt7.130.el8 | RHSA-2021:4140 |
| RHEL 8 | perf +26 | 4.18.0-348.el8 | RHSA-2021:4356 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP3 | kernel-64kb +6 | 5.3.18-150300.59.153.2 | SUSE-SU-2024:0857-1 |
| SLES 15 SP3 | kernel-default-base | 5.3.18-150300.59.153.2.150300.18.90.2 | SUSE-SU-2024:0857-1 |
| SLES 15 SP3 | kernel-syms | 5.3.18-150300.59.153.1 | SUSE-SU-2024:0857-1 |
| SLES 15 SP2 | kernel-default-base | 5.3.18-150200.24.183.1.150200.9.93.2 | SUSE-SU-2024:0926-1 |
| SLES 15 SP2 | kernel-docs +5 | 5.3.18-150200.24.183.1 | SUSE-SU-2024:0926-1 |
| SLES 12 SP5 | kernel-azure +2 | 4.12.14-16.182.1 | SUSE-SU-2024:1643-1 |
| SLES 12 SP5 | kernel-docs +4 | 4.12.14-122.216.1 | SUSE-SU-2024:1870-1 |
| SLES 11 SP4 | kernel-ec2 +5 | 3.0.101-108.153.1 | SUSE-SU-2024:1669-1 |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP3 | kernel-default-base | 5.3.18-150300.59.153.2.150300.18.90.2 | SUSE-SU-2024:0857-1 |
| SLES for SAP 15 SP3 | kernel-docs +4 | 5.3.18-150300.59.153.2 | SUSE-SU-2024:0857-1 |
| SLES for SAP 15 SP3 | kernel-syms | 5.3.18-150300.59.153.1 | SUSE-SU-2024:0857-1 |
| SLES for SAP 15 SP2 | kernel-default-base | 5.3.18-150200.24.183.1.150200.9.93.2 | SUSE-SU-2024:0926-1 |
| SLES for SAP 15 SP2 | kernel-docs +5 | 5.3.18-150200.24.183.1 | SUSE-SU-2024:0926-1 |
| SLES for SAP 12 SP5 | kernel-azure +2 | 4.12.14-16.182.1 | SUSE-SU-2024:1643-1 |
| SLES for SAP 12 SP5 | kernel-syms +2 | 4.12.14-122.216.1 | SUSE-SU-2024:1870-1 |
| SLE Real Time 12 SP5 | kernel-rt +3 | 4.12.14-10.182.1 | SUSE-SU-2024:1646-1 |
| SLE Micro 5.2 | kernel-default | 5.3.18-150300.59.153.2 | SUSE-SU-2024:0857-1 |
| SLE Micro 5.2 | kernel-default-base | 5.3.18-150300.59.153.2.150300.18.90.2 | SUSE-SU-2024:0857-1 |
| SLE Micro 5.2 | kernel-rt +1 | 5.3.18-150300.161.1 | SUSE-SU-2024:0856-1 |
| SLE Micro 5.1 | kernel-default | 5.3.18-150300.59.153.2 | SUSE-SU-2024:0857-1 |
| SLE Micro 5.1 | kernel-default-base | 5.3.18-150300.59.153.2.150300.18.90.2 | SUSE-SU-2024:0857-1 |
| SLE Micro 5.1 | kernel-rt +1 | 5.3.18-150300.161.1 | SUSE-SU-2024:0856-1 |
| SLE Live Patching 15 SP3 | kernel-default | 5.3.18-150300.59.153.2 | SUSE-SU-2024:0857-1 |
| SLE Live Patching 15 SP3 | kernel-livepatch-SLE15-SP3_Update_42 | 1-150300.7.3.2 | SUSE-SU-2024:0857-1 |
| SLE Live Patching 15 SP2 | kernel-default | 5.3.18-150200.24.183.1 | SUSE-SU-2024:0926-1 |
| SLE Live Patching 15 SP2 | kernel-livepatch-SLE15-SP2_Update_46 | 1-150200.5.3.2 | SUSE-SU-2024:0926-1 |
| SLE Live Patching 12 SP5 | kernel-default | 4.12.14-122.216.1 | SUSE-SU-2024:1870-1 |
| SLE Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_56 | 1-8.3.1 | SUSE-SU-2024:1870-1 |
| SLE HPC 15 SP3 | kernel-64kb +5 | 5.3.18-150300.59.153.2 | SUSE-SU-2024:0857-1 |
| SLE HPC 15 SP3 | kernel-default-base | 5.3.18-150300.59.153.2.150300.18.90.2 | SUSE-SU-2024:0857-1 |
| SLE HPC 15 SP3 | kernel-syms | 5.3.18-150300.59.153.1 | SUSE-SU-2024:0857-1 |
| SLE HPC 15 SP2 | kernel-default-base | 5.3.18-150200.24.183.1.150200.9.93.2 | SUSE-SU-2024:0926-1 |
| SLE HPC 15 SP2 | kernel-docs +5 | 5.3.18-150200.24.183.1 | SUSE-SU-2024:0926-1 |
| SUSE Enterprise Storage 7.1 | kernel-64kb +5 | 5.3.18-150300.59.153.2 | SUSE-SU-2024:0857-1 |
| SUSE Enterprise Storage 7.1 | kernel-default-base | 5.3.18-150300.59.153.2.150300.18.90.2 | SUSE-SU-2024:0857-1 |
| SUSE Enterprise Storage 7.1 | kernel-syms | 5.3.18-150300.59.153.1 | SUSE-SU-2024:0857-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | kernel-livepatch-4.14.232-176.381 | 1.0-0.amzn2 | ALAS2-2021-1636 |
| Amazon Linux 2 | perf +8 | 4.14.232-176.381.amzn2 | ALAS2-2021-1636 |
Advisories 11
- RHSA-2021:4356 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 2, 2026
- RHSA-2021:4140 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Aug 14, 2026
- WID-SEC-2024-0475 Linux-Kernel: Mehrere Schwachstellen ermöglichen Denial of Service und unspezifische Angriffe BSI CERT-Bund (WID) · Feb 16, 2026
- SUSE-SU-2024:1669-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:0926-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:1870-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:1646-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:1643-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:0857-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- SUSE-SU-2024:0856-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- ALAS2-2021-1636 Moderate: kernel security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · May 23, 2024
References
- https://git.kernel.org/stable/c/5871761c5f0f20d6e98bf3b6bd7486d857589554
- https://git.kernel.org/stable/c/0c71d4c89559f72cec2592d078681a843bce570e
- https://git.kernel.org/stable/c/24b699bea7553fc0b98dad9d864befb6005ac7f1
- https://git.kernel.org/stable/c/5c17cfe155d21954b4c7e2a78fa771cebcd86725
- https://git.kernel.org/stable/c/d7fad2ce15bdbbd0fec3ebe999fd7cab2267f53e
- https://git.kernel.org/stable/c/90642ee9eb581a13569b1c0bd57e85d962215273
- https://git.kernel.org/stable/c/0f000005da31f6947f843ce6b3e3a960540c6e00
- https://git.kernel.org/stable/c/41c44e1f3112d7265dae522c026399b2a42d19ef
- https://git.kernel.org/stable/c/2ad5692db72874f02b9ad551d26345437ea4f7f3