ACPI: processor: validate MADT IOAPIC entry bounds

Summary

In the Linux kernel, the following vulnerability has been resolved: ACPI: processor: validate MADT IOAPIC entry bounds The IOAPIC hotplug lookup parses both MADT and _MAT records directly. The MADT walk previously used a subtable's declared length to advance the cursor after only locating a generic header. The _MAT path likewise passed a generic header to the IOAPIC helper. Validate that a current record has a complete generic header, that its declared length is contained in the available record range, and that a typed IOAPIC record contains the full fixed IOAPIC body before reading its fields. Use the same relation for both MADT and _MAT provider paths.

Timeline

1. Sep 17, 2026, 4:10 PM UTCCVE published
2. Oct 19, 2026, 9:04 AM UTCRecord last updated

Affected versions

• Linux Linux

  From ecf5636dcd59cd5508641f995cc4c2bafedbb995 · fixed in 5601bd81bc290a724ed47797d22c16cba4d7ed9f; From ecf5636dcd59cd5508641f995cc4c2bafedbb995 · fixed in ff82e3374e9103d046b2a82f4315d9a422ff097d; From ecf5636dcd59cd5508641f995cc4c2bafedbb995 · fixed in 2a5520065e76000f8c979d3d7b3d861ccaaecf1e; From ecf5636dcd59cd5508641f995cc4c2bafedbb995 · fixed in 8e67b58c04990817ac2dbf8ae03353be6a358cd4; From ecf5636dcd59cd5508641f995cc4c2bafedbb995 · fixed in 74d84320f8e37955eb286a7777843d554e6e75b2; From ecf5636dcd59cd5508641f995cc4c2bafedbb995 · fixed in 4d8ecaa332c163f2b44aa5027bf061950b71b5f3; From ecf5636dcd59cd5508641f995cc4c2bafedbb995 · fixed in 355bee5f11acb116cd256588631b4028ca562646; From ecf5636dcd59cd5508641f995cc4c2bafedbb995 · fixed in 2c50ffdc73f3a70d745d249f509fc290754121e6

• Linux Linux

  4.0

• KernelLinux

  From 4.0.0 · fixed in 5.10.270; From 5.11.0 · fixed in 5.15.221; From 5.16.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.110; From 6.13.0 · fixed in 6.18.52; From 6.19.0 · fixed in 7.2.6

References 8