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-toolsUpgrade kernel-livepatch-5.15.93-55.139Upgrade bpftoolUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-livepatch-5.10.167-147.601Upgrade python-perfUpgrade perfUpgrade kernel-livepatch-4.14.305-227.531Upgrade kernelUpgrade kernel-debuginfoUpgrade python-perf-debuginfoUpgrade kernel-headersUpgrade perf-debuginfoUpgrade bpftool-debuginfoUpgrade kernel-tools-develUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-tools-debuginfoUpgrade kernel-devel | 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 python3-perfUpgrade kernel-toolsUpgrade kernel-abi-stablelists | Jul 1, 2025 | Mar 27, 2025 |
| Redhat_linux | — | No solution existsUpgrade kernel | Jul 9, 2025 | Mar 27, 2025 |
| Ubuntu | — | Upgrade linux-riscv-5.15Upgrade linux-fipsUpgrade linux-kvmUpgrade linux-xilinx-zynqmpUpgrade linux-hwe-5.4Upgrade linux-oracle-5.15Upgrade linux-intel-iot-realtimeUpgrade linux-gcp-4.15Upgrade linux-ibmUpgrade linux-gcpUpgrade linux-gkeopUpgrade linux-oracleUpgrade linux-azureUpgrade linux-lowlatencyUpgrade linux-aws-5.4Upgrade linux-gkeUpgrade linux-aws-hweUpgrade linux-gcp-5.15Upgrade linux-azure-5.15Upgrade linux-nvidiaUpgrade linux-azure-fipsUpgrade linux-aws-fipsUpgrade linux-hwe-5.15Upgrade linux-hweUpgrade linux-gcp-fipsUpgrade linux-realtimeUpgrade linux-azure-5.4Upgrade linux-intel-iotg-5.15Upgrade linux-intel-iotgUpgrade linux-azure-4.15Upgrade linux-raspi-5.4Upgrade linux-raspiUpgrade linux-lowlatency-hwe-5.15Upgrade linux-bluefieldUpgrade linux-nvidia-tegra-5.15Upgrade linux-awsUpgrade linux-gcp-5.4Upgrade linuxUpgrade linux-oracle-5.4Upgrade linux-ibm-5.4Upgrade linux-aws-5.15Upgrade linux-iot | 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 |
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