CVE-2026-99148 (GCVE-0-2026-99148)

Vulnerability from cvelistv5 – Published: 2026-10-28 10:35 – Updated: 2026-10-31 12:43
VLAI
Title
drm/amdgpu: keep the eviction fence until the last handle is closed
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: keep the eviction fence until the last handle is closed amdgpu_gem_object_close() detaches the user queue eviction fence from the BO before it checks bo_va->ref_count, so closing any handle of a BO removes the fence, even when the file still has another handle to the BO and the bo_va with its GPU mappings stays. The BO can then be evicted without suspending the user queues of the file, which keep accessing it through mappings that are only marked for update. Seen on navi31 with a SDMA user queue: a BO opened twice in the same file (GEM_FLINK + GEM_OPEN) loses its eviction fence when the second handle is closed (traced attach/detach of the fence): attach bo=ffff8c78a6c84c00 GEM_CLOSE handle=7 detach bo=ffff8c78a6c84c00 while handle 6 and the mapping are still in use. Only detach the fence when the last reference to the bo_va goes away, matching amdgpu_gem_object_open(), which attaches it only when the bo_va is created. With this the fence stays until the file is closed. (cherry picked from commit 8387982f03d4026b7dc11b0b5e3118298eee4d6a)
Severity
7 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6846 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 31f7efcdca4d1caaa3a0babc33377e27e6f9b593 , < dce8f7f03a47b1744dccf506268f9229b67fab47 (git)
Affected: 31f7efcdca4d1caaa3a0babc33377e27e6f9b593 , < 6467c4cc83b94850bfea614e9f98276edf9a7c3f (git)
Affected: 31f7efcdca4d1caaa3a0babc33377e27e6f9b593 , < 3c44cbcec5eb370713bbd2c315ed7c34d8ccec2b (git)
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Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.18.59 , ≤ 6.18.* (semver)
Unaffected: 7.2.13 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c"
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              "status": "unaffected",
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: keep the eviction fence until the last handle is closed\n\namdgpu_gem_object_close() detaches the user queue eviction fence from\nthe BO before it checks bo_va-\u003eref_count, so closing any handle of a BO\nremoves the fence, even when the file still has another handle to the\nBO and the bo_va with its GPU mappings stays. The BO can then be evicted\nwithout suspending the user queues of the file, which keep accessing it\nthrough mappings that are only marked for update.\n\nSeen on navi31 with a SDMA user queue: a BO opened twice in the same\nfile (GEM_FLINK + GEM_OPEN) loses its eviction fence when the second\nhandle is closed (traced attach/detach of the fence):\n\n  attach bo=ffff8c78a6c84c00\n  GEM_CLOSE handle=7\n  detach bo=ffff8c78a6c84c00\n\nwhile handle 6 and the mapping are still in use.\n\nOnly detach the fence when the last reference to the bo_va goes away,\nmatching amdgpu_gem_object_open(), which attaches it only when the\nbo_va is created. With this the fence stays until the file is closed.\n\n(cherry picked from commit 8387982f03d4026b7dc11b0b5e3118298eee4d6a)"
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            "baseSeverity": "HIGH",
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            "version": "3.1"
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              "lang": "en",
              "value": "AV:L - A local process reaches patched amdgpu_gem_object_close() through DRM_IOCTL_GEM_CLOSE -\u003e drm_gem_handle_delete() after duplicating the BO handle with DRM_IOCTL_GEM_FLINK/OPEN; no network or physical input reaches this path.\nAC:H - The handle-close and memory-pressure sequence is attacker-controlled, but affected GFX11/GFX12 and SDMA6/7 paths set disable_uq=true for the default amdgpu.user_queue=-1; exploitation requires an administrator-controlled non-default user-queue configuration.\nPR:L - FLINK/OPEN require an authenticated primary-node DRM client, but not root, and amdgpu_userq_priority_permit() allows normal-priority queues without capabilities; CAP_SYS_NICE or DRM master is required only for high priority.\nUI:N - The same process can issue GEM_FLINK, GEM_OPEN, GEM_CLOSE, create the user queue, ring its doorbell, and generate eviction pressure without another user\u0027s action.\nS:U - The stale per-file amdgpu_fpriv GPUVM mapping can affect BO memory managed by the same host DRM/kernel authority; it does not cross a guest-host or IOMMU security authority.\nC:H - After the fence is detached, amdgpu_bo_move_notify() only marks the bo_va moved, leaving its readable PTE stale until queue restoration; attacker-controlled SDMA copy packets can read BO backing that reuses the released physical VRAM.\nI:H - The same stale writable GPU PTE lets attacker-controlled user-queue packets write into a reallocated BO\u0027s backing memory, providing cross-allocation GPU-memory corruption rather than merely corrupting the attacker\u0027s moved BO.\nA:H - Accessing moved or reused ring/data backing can hang the user queue or GPU; amdgpu_userq_hang_detect_work() can escalate failed per-queue recovery to amdgpu_device_gpu_recover(), disrupting all GPU clients."
            }
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        "dateUpdated": "2026-10-31T12:43:54.856Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/3c44cbcec5eb370713bbd2c315ed7c34d8ccec2b"
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      "title": "drm/amdgpu: keep the eviction fence until the last handle is closed",
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    "datePublished": "2026-10-28T10:35:04.360Z",
    "dateReserved": "2026-09-25T10:25:14.396Z",
    "dateUpdated": "2026-10-31T12:43:54.856Z",
    "state": "PUBLISHED"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: keep the eviction fence until the last handle is closed\n\namdgpu_gem_object_close() detaches the user queue eviction fence from\nthe BO before it checks bo_va-\u003eref_count, so closing any handle of a BO\nremoves the fence, even when the file still has another handle to the\nBO and the bo_va with its GPU mappings stays. The BO can then be evicted\nwithout suspending the user queues of the file, which keep accessing it\nthrough mappings that are only marked for update.\n\nSeen on navi31 with a SDMA user queue: a BO opened twice in the same\nfile (GEM_FLINK + GEM_OPEN) loses its eviction fence when the second\nhandle is closed (traced attach/detach of the fence):\n\n  attach bo=ffff8c78a6c84c00\n  GEM_CLOSE handle=7\n  detach bo=ffff8c78a6c84c00\n\nwhile handle 6 and the mapping are still in use.\n\nOnly detach the fence when the last reference to the bo_va goes away,\nmatching amdgpu_gem_object_open(), which attaches it only when the\nbo_va is created. With this the fence stays until the file is closed.\n\n(cherry picked from commit 8387982f03d4026b7dc11b0b5e3118298eee4d6a)"
          }
        ],
        "id": "CVE-2026-99148",
        "lastModified": "2026-10-31T13:17:57.317",
        "metrics": {
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                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
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                "scope": "UNCHANGED",
                "userInteraction": "NONE",
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              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "vulnStatus": "Received"
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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-11-01T14:56:41+00:00",
      "cve": "CVE-2026-99148",
      "id": "CVE-2026-99148",
      "initial_release_date": "2026-10-28T10:35:04.360000+00:00",
      "product_status:known_affected": "186",
      "product_status:known_not_affected": "93",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: kernel: amdgpu: memory corruption via premature eviction fence detachment",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-99148.json",
      "version": "3"
    }
  }
}



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