# CVE-2026-89828: drm/amdgpu: Fix init ordering in amdgpu_vram_mgr_init()

CVE-2026-89828 is fixed in linux on 1 platform by DEBIAN-CVE-2026-89828 (version 7.2.6-1), released September 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-89828
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0022
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 16, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-89828

## Description

In the Linux kernel, the following vulnerability has been resolved:  drm/amdgpu: Fix init ordering in amdgpu_vram_mgr_init()  drmm_cgroup_register_region() is called before INIT_LIST_HEAD() and gpu_buddy_init() in amdgpu_vram_mgr_init(). If it fails, the function returns early and bypasses those initializations.  Since adev->mman.initialized is set to true before amdgpu_vram_mgr_init() is called, a failure triggers amdgpu_ttm_fini(), which calls amdgpu_vram_mgr_fini(), which then:   - Calls list_for_each_entry_safe() on reservations_pending and    reserved_pages, whose list_head::next pointers are zero-initialized    (NULL). The loop does not recognize them as empty and dereferences NULL.   - Calls gpu_buddy_fini(), which iterates free_trees[] unconditionally    via for_each_free_tree(). Since mm->free_trees is NULL    (never allocated), this dereferences NULL.  Both result in a kernel panic on the module load error path.  Fix by moving drmm_cgroup_register_region() to after the list and buddy allocator are fully initialized, so the teardown path is safe to run.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.2.6-1 | [DEBIAN-CVE-2026-89828](https://patchblox.com/security/data/fix/linux/debian-cve-2026-89828.md) | Sep 23, 2026 |

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Data as of 2026-11-09T07:25:28Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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