# CVE-2026-23034: linux: In the Linux kernel, the following vulnerability has been resolved:  drm/amdgpu/userq: Fix fence reference leak on qu...

CVE-2026-23034 is fixed in linux on 1 platform by DEBIAN-CVE-2026-23034 (version 6.18.8-1), released January 31, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-23034
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0020
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 31, 2026

## Description

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)

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 6.18.8-1 | [DEBIAN-CVE-2026-23034](https://patchblox.com/security/data/fix/linux/debian-cve-2026-23034.md) | Jan 31, 2026 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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