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.
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-livepatch-5.10.167-147.601Upgrade kernel-livepatch-5.15.93-55.139Upgrade kernel-toolsUpgrade perfUpgrade python-perfUpgrade kernel-debuginfo-common-aarch64Upgrade bpftoolUpgrade kernel-develUpgrade kernel-tools-debuginfoUpgrade bpftool-debuginfoUpgrade kernel-livepatch-4.14.305-227.531Upgrade kernelUpgrade kernel-tools-develUpgrade kernel-debuginfo-common-x86_64Upgrade python-perf-debuginfoUpgrade kernel-debuginfoUpgrade perf-debuginfoUpgrade kernel-headers | May 21, 2025 | Mar 27, 2025 |
| Debian | — | Upgrade linux | Mar 31, 2025 | Mar 27, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernelUpgrade kernel-tools-libsUpgrade bpftoolUpgrade kernel-abi-stablelistsUpgrade kernel-toolsUpgrade python3-perf | Jul 1, 2025 | Mar 27, 2025 |
| Redhat_linux | — | No solution existsUpgrade kernel | Jul 9, 2025 | Mar 27, 2025 |
| Ubuntu | — | Upgrade linux-gkeopUpgrade linux-hwe-5.4Upgrade linux-aws-fipsUpgrade linux-intel-iot-realtimeUpgrade linux-fipsUpgrade linux-hweUpgrade linux-realtimeUpgrade linux-aws-5.4Upgrade linux-riscv-5.15Upgrade linux-intel-iotgUpgrade linux-kvmUpgrade linux-gcpUpgrade linux-gcp-5.15Upgrade linux-intel-iotg-5.15Upgrade linux-nvidiaUpgrade linux-azure-fipsUpgrade linux-oracle-5.15Upgrade linux-hwe-5.15Upgrade linux-aws-hweUpgrade linux-lowlatencyUpgrade linux-gcp-fipsUpgrade linux-ibmUpgrade linux-azure-5.15Upgrade linux-xilinx-zynqmpUpgrade linux-azure-5.4Upgrade linux-gcp-4.15Upgrade linux-oracleUpgrade linux-gkeUpgrade linux-azureUpgrade linux-ibm-5.4Upgrade linux-awsUpgrade linux-lowlatency-hwe-5.15Upgrade linuxUpgrade linux-bluefieldUpgrade linux-aws-5.15Upgrade linux-iotUpgrade linux-nvidia-tegra-5.15Upgrade linux-raspiUpgrade linux-raspi-5.4Upgrade linux-azure-4.15Upgrade linux-oracle-5.4Upgrade linux-gcp-5.4 | 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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