Bug 2502452 (CVE-2026-63881)

Summary: CVE-2026-63881 kernel: drm/amdkfd: fix a vulnerability of integer overflow in kfd debugger
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's AMD KFD (Kernel Fusion Driver) debugger component. The `get_queue_ids()` function, responsible for handling queue identifiers, contains an integer overflow vulnerability. This occurs when calculating the size of an array, where a malicious local user could provide a large number of queues, causing the size calculation to wrap around on 32-bit systems. This could lead to a heap buffer overflow, potentially resulting in a denial of service or, in certain scenarios, privilege escalation.
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Description OSIDB Bzimport 2026-07-19 16:08:57 UTC 
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)
Comment 1 Mauro Matteo Cascella 2026-07-21 13:57:32 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026071939-CVE-2026-63881-5a86@gregkh/T