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In the Linux kernel, the following vulnerability has been resolved:
x86/i8259: Mark legacy PIC interrupts with IRQ_LEVEL
Baoquan reported that after triggering a crash the subsequent crash-kernel fails to boot about half of the time. It triggers a NULL pointer dereference in the periodic tick code.
This happens because the legacy timer interrupt (IRQ0) is resent in software which happens in soft interrupt (tasklet) context. In this context get_irq_regs() returns NULL which leads to the NULL pointer dereference.
The reason for the resend is a spurious APIC interrupt on the IRQ0 vector which is captured and leads to a resend when the legacy timer interrupt is enabled. This is wrong because the legacy PIC interrupts are level triggered and therefore should never be resent in software, but nothing ever sets the IRQ_LEVEL flag on those interrupts, so the core code does not know about their trigger type.
Ensure that IRQ_LEVEL is set when the legacy PCI interrupts are set up.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernelUpgrade kernel-develUpgrade kernel-tools-debuginfoUpgrade perf-debuginfoUpgrade kernel-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-headersUpgrade bpftool-debuginfoUpgrade kernel-tools-develUpgrade kernel-livepatch-4.14.305-227.531Upgrade python-perf-debuginfoUpgrade kernel-livepatch-5.10.167-147.601Upgrade kernel-toolsUpgrade bpftoolUpgrade kernel-livepatch-5.15.93-55.139Upgrade kernel-debuginfo-common-aarch64Upgrade python-perfUpgrade perf | May 21, 2025 | Mar 27, 2025 |
| Debian | — | Upgrade linux | Mar 31, 2025 | Mar 27, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade bpftoolUpgrade kernelUpgrade kernel-tools-libsUpgrade kernel-toolsUpgrade python3-perfUpgrade kernel-abi-stablelists | Jul 1, 2025 | Mar 27, 2025 |
| Redhat_linux | — | No solution existsUpgrade kernel | Jul 9, 2025 | Mar 27, 2025 |
| Ubuntu | — | Upgrade linux-iotUpgrade linux-bluefieldUpgrade linux-raspi-5.4Upgrade linux-gcp-5.4Upgrade linux-oracle-5.4Upgrade linux-nvidia-tegra-5.15Upgrade linux-lowlatency-hwe-5.15Upgrade linux-raspiUpgrade linux-azure-4.15Upgrade linux-awsUpgrade linux-ibm-5.4Upgrade linuxUpgrade linux-aws-5.15Upgrade linux-realtimeUpgrade linux-gcp-5.15Upgrade linux-aws-fipsUpgrade linux-gkeUpgrade linux-nvidiaUpgrade linux-hweUpgrade linux-fipsUpgrade linux-gcp-fipsUpgrade linux-kvmUpgrade linux-hwe-5.15Upgrade linux-azure-fipsUpgrade linux-ibmUpgrade linux-lowlatencyUpgrade linux-intel-iotg-5.15Upgrade linux-riscv-5.15Upgrade linux-azure-fdeUpgrade linux-gcpUpgrade linux-xilinx-zynqmpUpgrade linux-gcp-4.15Upgrade linux-aws-5.4Upgrade linux-oracle-5.15Upgrade linux-azure-5.4Upgrade linux-hwe-5.4Upgrade linux-aws-hweUpgrade linux-gkeopUpgrade linux-azure-5.15Upgrade linux-intel-iot-realtimeUpgrade linux-intel-iotgUpgrade linux-azureUpgrade linux-oracle | Apr 1, 2025 | Mar 27, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Mar 27, 2025 |
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