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