CVE-2026-23034 (GCVE-0-2026-23034)

Vulnerability from cvelistv5 – Published: 2026-01-31 11:42 – Updated: 2026-05-11 21:58
VLAI?
Title
drm/amdgpu/userq: Fix fence reference leak on queue teardown v2
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/userq: Fix fence reference leak on queue teardown v2 The user mode queue keeps a pointer to the most recent fence in userq->last_fence. This pointer holds an extra dma_fence reference. When the queue is destroyed, we free the fence driver and its xarray, but we forgot to drop the last_fence reference. Because of the missing dma_fence_put(), the last fence object can stay alive when the driver unloads. This leaves an allocated object in the amdgpu_userq_fence slab cache and triggers This is visible during driver unload as: BUG amdgpu_userq_fence: Objects remaining on __kmem_cache_shutdown() kmem_cache_destroy amdgpu_userq_fence: Slab cache still has objects Call Trace: kmem_cache_destroy amdgpu_userq_fence_slab_fini amdgpu_exit __do_sys_delete_module Fix this by putting userq->last_fence and clearing the pointer during amdgpu_userq_fence_driver_free(). This makes sure the fence reference is released and the slab cache is empty when the module exits. v2: Update to only release userq->last_fence with dma_fence_put() (Christian) (cherry picked from commit 8e051e38a8d45caf6a866d4ff842105b577953bb)
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: edc762a51c7181d6fe1e0837e2eb69afb406f98e , < e1a30e1ab33fc522785d04bbf7e1b13a5c5c9175 (git)
Affected: edc762a51c7181d6fe1e0837e2eb69afb406f98e , < b2426a211dba6432e32a2e70e9183c6e134475c6 (git)
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Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.18.7 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/amdgpu_userq_fence.c"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu/userq: Fix fence reference leak on queue teardown v2\n\nThe user mode queue keeps a pointer to the most recent fence in\nuserq-\u003elast_fence. This pointer holds an extra dma_fence reference.\n\nWhen the queue is destroyed, we free the fence driver and its xarray,\nbut we forgot to drop the last_fence reference.\n\nBecause of the missing dma_fence_put(), the last fence object can stay\nalive when the driver unloads. This leaves an allocated object in the\namdgpu_userq_fence slab cache and triggers\n\nThis is visible during driver unload as:\n\n  BUG amdgpu_userq_fence: Objects remaining on __kmem_cache_shutdown()\n  kmem_cache_destroy amdgpu_userq_fence: Slab cache still has objects\n  Call Trace:\n    kmem_cache_destroy\n    amdgpu_userq_fence_slab_fini\n    amdgpu_exit\n    __do_sys_delete_module\n\nFix this by putting userq-\u003elast_fence and clearing the pointer during\namdgpu_userq_fence_driver_free().\n\nThis makes sure the fence reference is released and the slab cache is\nempty when the module exits.\n\nv2: Update to only release userq-\u003elast_fence with dma_fence_put()\n    (Christian)\n\n(cherry picked from commit 8e051e38a8d45caf6a866d4ff842105b577953bb)"
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        "dateUpdated": "2026-05-11T21:58:43.438Z",
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          "url": "https://git.kernel.org/stable/c/b2426a211dba6432e32a2e70e9183c6e134475c6"
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      "title": "drm/amdgpu/userq: Fix fence reference leak on queue teardown v2",
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    "cveId": "CVE-2026-23034",
    "datePublished": "2026-01-31T11:42:29.137Z",
    "dateReserved": "2026-01-13T15:37:45.942Z",
    "dateUpdated": "2026-05-11T21:58:43.438Z",
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}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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Detection rules are retrieved from Rulezet.