In the Linux kernel, the following vulnerability has been resolved:
serial: 8250: Reinit port->pm on port specific driver unbind
When we unbind a serial port hardware specific 8250 driver, the generic serial8250 driver takes over the port. After that we see an oops about 10 seconds later. This can produce the following at least on some TI SoCs:
Unhandled fault: imprecise external abort (0x1406) Internal error: : 1406 [#1] SMP ARM
Turns out that we may still have the serial port hardware specific driver port->pm in use, and serial8250_pm() tries to call it after the port specific driver is gone:
serial8250_pm [8250_base] from uart_change_pm+0x54/0x8c [serial_base] uart_change_pm [serial_base] from uart_hangup+0x154/0x198 [serial_base] uart_hangup [serial_base] from __tty_hangup.part.0+0x328/0x37c __tty_hangup.part.0 from disassociate_ctty+0x154/0x20c disassociate_ctty from do_exit+0x744/0xaac do_exit from do_group_exit+0x40/0x8c do_group_exit from __wake_up_parent+0x0/0x1c
Let's fix the issue by calling serial8250_set_defaults() in serial8250_unregister_port(). This will set the port back to using the serial8250 default functions, and sets the port->pm to point to serial8250_pm.
CVSS Details
- CVSS 3.1 Base Score: 7.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade python-perfUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-livepatch-5.10.184-174.730Upgrade kernel-develUpgrade perf-debuginfoUpgrade kernel-headersUpgrade python-perf-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade bpftool-debuginfoUpgrade kernel-tools-debuginfoUpgrade kernel-debuginfoUpgrade kernelUpgrade kernel-tools-develUpgrade bpftoolUpgrade perfUpgrade kernel-livepatch-5.15.117-72.142Upgrade kernel-toolsUpgrade kernel-livepatch-4.14.318-240.529 | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade bpftool-debuginfoUpgrade perfUpgrade perf-debuginfoUpgrade bpftoolUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-toolsUpgrade kernel-libbpf-develUpgrade kernel-libbpf-staticUpgrade kernel-tools-develUpgrade kernel-develUpgrade kernel-libbpfUpgrade python3-perf-debuginfoUpgrade kernelUpgrade kernel-headersUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-tools-debuginfoUpgrade kernel-debuginfoUpgrade python3-perfUpgrade kernel-livepatch-6.1.34-56.100 | Oct 16, 2025 | Sep 15, 2025 |
| Debian | — | Upgrade linux | Sep 17, 2025 | Sep 17, 2025 |
| Huawei Euleros 2_0_sp10 | — | Upgrade kernel-toolsUpgrade kernel-abi-stablelistsUpgrade kernel-tools-libsUpgrade python3-perfUpgrade kernel | Jan 15, 2026 | Jan 13, 2026 |
| Huawei Euleros 2_0_sp13 | — | Upgrade python3-perfUpgrade kernelUpgrade kernel-abi-stablelistsUpgrade kernel-tools-libsUpgrade bpftoolUpgrade kernel-tools | Dec 12, 2025 | Dec 11, 2025 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Sep 15, 2025 |
| Ubuntu | — | Upgrade linux-oracle-5.4Upgrade linux-oracle-5.15Upgrade linux-aws-5.4Upgrade linux-azure-5.4Upgrade linux-raspi-5.4Upgrade linux-kvmUpgrade linux-intel-iotg-5.15Upgrade linux-xilinx-zynqmpUpgrade linux-oracleUpgrade linux-gcp-5.15Upgrade linux-lowlatency-hwe-5.15Upgrade linux-raspiUpgrade linux-gkeUpgrade linux-bluefieldUpgrade linux-realtimeUpgrade linux-aws-5.15Upgrade linux-iotUpgrade linux-hwe-5.15Upgrade linux-nvidiaUpgrade linux-azureUpgrade linux-lowlatencyUpgrade linux-ibm-5.15Upgrade linux-awsUpgrade linux-intel-iot-realtimeUpgrade linux-gkeopUpgrade linux-gcp-fipsUpgrade linux-fipsUpgrade linux-ibmUpgrade linux-azure-fipsUpgrade linux-hwe-5.4Upgrade linux-nvidia-tegra-5.15Upgrade linux-intel-iotgUpgrade linux-azure-fde-5.15Upgrade linux-riscv-5.15Upgrade linux-gcp-5.4Upgrade linux-nvidia-tegraUpgrade linux-azure-5.15Upgrade linux-ibm-5.4Upgrade linux-gcpUpgrade linux-nvidia-tegra-igxUpgrade linux-aws-fipsUpgrade linux | Sep 19, 2025 | Sep 16, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 15, 2025 | Sep 15, 2025 |
Prioritise with Active Threat Intelligence
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub