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 kernel-debuginfo-common-aarch64Upgrade kernel-debuginfoUpgrade python-perfUpgrade kernel-debuginfo-common-x86_64Upgrade perf-debuginfoUpgrade bpftool-debuginfoUpgrade kernel-livepatch-5.10.184-174.730Upgrade kernel-headersUpgrade kernel-develUpgrade python-perf-debuginfoUpgrade kernel-tools-debuginfoUpgrade kernelUpgrade kernel-tools-develUpgrade kernel-toolsUpgrade kernel-livepatch-4.14.318-240.529Upgrade perfUpgrade kernel-livepatch-5.15.117-72.142Upgrade bpftool | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade kernel-develUpgrade python3-perfUpgrade kernel-libbpf-develUpgrade kernel-livepatch-6.1.34-56.100Upgrade kernelUpgrade kernel-tools-debuginfoUpgrade kernel-libbpfUpgrade kernel-tools-develUpgrade kernel-debuginfoUpgrade python3-perf-debuginfoUpgrade kernel-headersUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-libbpf-staticUpgrade perf-debuginfoUpgrade perfUpgrade kernel-toolsUpgrade kernel-debuginfo-common-aarch64Upgrade bpftool-debuginfoUpgrade bpftool | Oct 16, 2025 | Sep 15, 2025 |
| Debian | — | Upgrade linux | Sep 17, 2025 | Sep 17, 2025 |
| Huawei Euleros 2_0_sp10 | — | Upgrade kernel-abi-stablelistsUpgrade kernel-toolsUpgrade kernelUpgrade kernel-tools-libsUpgrade python3-perf | Jan 15, 2026 | Jan 13, 2026 |
| Huawei Euleros 2_0_sp13 | — | Upgrade python3-perfUpgrade kernelUpgrade kernel-tools-libsUpgrade kernel-toolsUpgrade bpftoolUpgrade kernel-abi-stablelists | Dec 12, 2025 | Dec 11, 2025 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Sep 15, 2025 |
| Ubuntu | — | Upgrade linux-gcpUpgrade linux-nvidia-tegra-igxUpgrade linux-aws-fipsUpgrade linux-nvidia-tegraUpgrade linuxUpgrade linux-hwe-5.4Upgrade linux-intel-iotgUpgrade linux-ibm-5.4Upgrade linux-intel-iot-realtimeUpgrade linux-azure-5.15Upgrade linux-riscv-5.15Upgrade linux-awsUpgrade linux-gcp-5.4Upgrade linux-gkeopUpgrade linux-azure-fde-5.15Upgrade linux-ibmUpgrade linux-gcp-fipsUpgrade linux-fipsUpgrade linux-azure-fipsUpgrade linux-nvidia-tegra-5.15Upgrade linux-ibm-5.15Upgrade linux-oracleUpgrade linux-gcp-5.15Upgrade linux-nvidiaUpgrade linux-lowlatencyUpgrade linux-oracle-5.4Upgrade linux-lowlatency-hwe-5.15Upgrade linux-raspi-5.4Upgrade linux-intel-iotg-5.15Upgrade linux-hwe-5.15Upgrade linux-azureUpgrade linux-xilinx-zynqmpUpgrade linux-bluefieldUpgrade linux-iotUpgrade linux-aws-5.4Upgrade linux-realtimeUpgrade linux-azure-5.4Upgrade linux-gkeUpgrade linux-kvmUpgrade linux-raspiUpgrade linux-aws-5.15Upgrade linux-oracle-5.15 | 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