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CVE-2026-92522: ACPI: processor: validate MADT IOAPIC entry bounds

• Severity: high (CVSS 7.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-17 · updated 2026-10-19

Description

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.

Affected products

• Linux kernel: 4.0 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/2a5520065e76000f8c979d3d7b3d861ccaaecf1e
• https://git.kernel.org/stable/c/2c50ffdc73f3a70d745d249f509fc290754121e6
• https://git.kernel.org/stable/c/355bee5f11acb116cd256588631b4028ca562646
• https://git.kernel.org/stable/c/4d8ecaa332c163f2b44aa5027bf061950b71b5f3
• https://git.kernel.org/stable/c/5601bd81bc290a724ed47797d22c16cba4d7ed9f
• https://git.kernel.org/stable/c/74d84320f8e37955eb286a7777843d554e6e75b2
• https://git.kernel.org/stable/c/8e67b58c04990817ac2dbf8ae03353be6a358cd4
• https://git.kernel.org/stable/c/ff82e3374e9103d046b2a82f4315d9a422ff097d

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