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 perfUpgrade kernel-debuginfo-common-aarch64Upgrade python-perfUpgrade kernel-toolsUpgrade bpftoolUpgrade kernel-livepatch-5.10.167-147.601Upgrade kernel-livepatch-5.15.93-55.139Upgrade kernel-livepatch-4.14.305-227.531Upgrade kernel-debuginfo-common-x86_64Upgrade perf-debuginfoUpgrade kernel-headersUpgrade kernel-debuginfoUpgrade kernel-tools-debuginfoUpgrade kernelUpgrade kernel-tools-develUpgrade kernel-develUpgrade bpftool-debuginfoUpgrade python-perf-debuginfo | May 21, 2025 | Mar 27, 2025 |
| Debian | — | Upgrade linux | Mar 31, 2025 | Mar 27, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernel-abi-stablelistsUpgrade kernel-toolsUpgrade python3-perfUpgrade kernel-tools-libsUpgrade bpftoolUpgrade kernel | Jul 1, 2025 | Mar 27, 2025 |
| Redhat_linux | — | Upgrade kernelNo solution exists | Jul 9, 2025 | Mar 27, 2025 |
| Ubuntu | — | Upgrade linux-lowlatency-hwe-5.15Upgrade linuxUpgrade linux-awsUpgrade linux-ibm-5.4Upgrade linux-aws-5.15Upgrade linux-gcp-5.4Upgrade linux-oracle-5.4Upgrade linux-raspi-5.4Upgrade linux-nvidia-tegra-5.15Upgrade linux-raspiUpgrade linux-bluefieldUpgrade linux-azure-4.15Upgrade linux-iotUpgrade linux-intel-iotg-5.15Upgrade linux-gkeopUpgrade linux-aws-fipsUpgrade linux-ibmUpgrade linux-xilinx-zynqmpUpgrade linux-intel-iot-realtimeUpgrade linux-aws-5.4Upgrade linux-azureUpgrade linux-gcp-4.15Upgrade linux-azure-5.4Upgrade linux-gkeUpgrade linux-fipsUpgrade linux-gcpUpgrade linux-kvmUpgrade linux-oracleUpgrade linux-gcp-fipsUpgrade linux-oracle-5.15Upgrade linux-intel-iotgUpgrade linux-hwe-5.15Upgrade linux-azure-5.15Upgrade linux-riscv-5.15Upgrade linux-nvidiaUpgrade linux-hwe-5.4Upgrade linux-lowlatencyUpgrade linux-gcp-5.15Upgrade linux-realtimeUpgrade linux-hweUpgrade linux-azure-fipsUpgrade linux-aws-hwe | 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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