CVE-2026-74448: drm/amdkfd: fix QID bit leak in pqm_create_queue()

Severity: unknown
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-15 · updated 2026-08-18

Description

In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: fix QID bit leak in pqm_create_queue() When MES is enabled and amdgpu_amdkfd_alloc_kernel_mem() fails during the first queue creation for a process, pqm_create_queue() returns early via 'return retval' without going through the err_create_queue cleanup label. This means clear_bit(*qid, pqm->queue_slot_bitmap) is never called, leaving the reserved QID bit permanently set in queue_slot_bitmap. Over time this leaks QID slots, potentially exhausting all available queue slots. Fix this by replacing 'return retval' with 'goto err_allocate_pqn' so that clear_bit() is always called on the error path without touching the uninitialized pqn pointer. AILIKFD-813 (cherry picked from commit a107f74c38edbb80d6ab64dcaeeb292c14e9779f)

Affected products

Linux kernel: from 6.6.87 before 6.6.151; from 6.12.23 before 6.12.103; from 6.13.11 before 6.14; from 6.14.2 before 6.15; 6.15 — fixed in 6.12.103, 6.14, 6.15, 6.6.151, 7.2

How to fix

Upgrade to a fixed version: Linux kernel 6.12.103, 6.14, 6.15, 6.6.151. Check the vendor advisory for mitigations.

References

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