CVE-2022-50454 (GCVE-0-2022-50454)
Vulnerability from cvelistv5
Published
2025-10-01 11:45
Modified
2026-08-05 08:58
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/nouveau: fix a use-after-free in nouveau_gem_prime_import_sg_table() nouveau_bo_init() is backed by ttm_bo_init() and ferries its return code back to the caller. On failures, ttm will call nouveau_bo_del_ttm() and free the memory.Thus, when nouveau_bo_init() returns an error, the gem object has already been released. Then the call to nouveau_bo_ref() will use the freed "nvbo->bo" and lead to a use-after-free bug. We should delete the call to nouveau_bo_ref() to avoid the use-after-free.
References
Impacted products
Vendor Product Version
Linux Linux Version: 019cbd4a4feb3aa3a917d78e7110e3011bbff6d5
Version: 019cbd4a4feb3aa3a917d78e7110e3011bbff6d5
Version: 019cbd4a4feb3aa3a917d78e7110e3011bbff6d5
Version: 019cbd4a4feb3aa3a917d78e7110e3011bbff6d5
Version: 019cbd4a4feb3aa3a917d78e7110e3011bbff6d5
Version: 019cbd4a4feb3aa3a917d78e7110e3011bbff6d5
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/nouveau/nouveau_prime.c"
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          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "version": "6.0.3",
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              "status": "unaffected",
              "version": "6.1",
              "versionType": "original_commit_for_fix"
            }
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      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.220",
                  "versionStartIncluding": "5.4",
                  "vulnerable": true
                },
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/nouveau: fix a use-after-free in nouveau_gem_prime_import_sg_table()\n\nnouveau_bo_init() is backed by ttm_bo_init() and ferries its return code\nback to the caller. On failures, ttm will call nouveau_bo_del_ttm() and\nfree the memory.Thus, when nouveau_bo_init() returns an error, the gem\nobject has already been released. Then the call to nouveau_bo_ref() will\nuse the freed \"nvbo-\u003ebo\" and lead to a use-after-free bug.\n\nWe should delete the call to nouveau_bo_ref() to avoid the use-after-free."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The UAF is reached only via local DRM_IOCTL_PRIME_FD_TO_HANDLE on a Nouveau render/primary node (drm_gem_prime_fd_to_handle \u2192 drm_gem_prime_import \u2192 nouveau_gem_prime_import_sg_table); there is no network or adjacent-protocol path into this GPU PRIME import code.\nAC:L - An unprivileged attacker who can open Nouveau and obtain a foreign dma-buf (common hybrid iGPU\u2192Nouveau PRIME, v4l2, or dma-heap) can induce nouveau_bo_init/ttm_bo_init failure via GART/TTM/VMA resource exhaustion so the post-free nouveau_bo_ref() runs deterministically; this is not an attacker-uncontrollable race.\nPR:L - DRM_IOCTL_PRIME_FD_TO_HANDLE is DRM_RENDER_ALLOW and usable by an unprivileged local user with access to /dev/dri/renderD* (render/video group or seat uaccess), without real root or init-namespace admin.\nUI:N - The attacker opens the render node and issues the PRIME FD-to-handle ioctl themselves; no separate victim mount, file open, or interactive action is required.\nS:U - Impact is confined to the host kernel\u0027s Nouveau/TTM heap within the same OS security authority; this is local privilege-escalation class corruption, not a VM escape, IOMMU bypass, or sandbox boundary cross.\nC:H - On nouveau_bo_init failure, ttm already calls nouveau_bo_del_ttm()/kfree(nvbo), then the buggy nouveau_bo_ref() performs ttm_bo_put() on the freed object\u2014a classic UAF that per guidance enables arbitrary kernel read via reclaim/spray.\nI:H - The same post-free ttm_bo_put()/kref path corrupts heap metadata and enables reuse of the freed nouveau_bo for arbitrary write and control-flow hijack primitives.\nA:H - Use-after-free on the freed TTM/GEM object produces kernel oops/panic even when not fully exploited, which scores Availability High under kernel CVSS guidance."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:58:51.159Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/56ee9577915dc06f55309901012a9ef68dbdb5a8"
        },
        {
          "url": "https://git.kernel.org/stable/c/5d6093c49c098d86c7b136aba9922df44aeb6944"
        },
        {
          "url": "https://git.kernel.org/stable/c/861f085f81fd569b02cc2c11165a9e6cca144424"
        },
        {
          "url": "https://git.kernel.org/stable/c/3aeda2fe6517cc52663d4ce3588dd43f0d4124a7"
        },
        {
          "url": "https://git.kernel.org/stable/c/7d80473e9f12548ac05b36af4fb9ce80f2f73509"
        },
        {
          "url": "https://git.kernel.org/stable/c/540dfd188ea2940582841c1c220bd035a7db0e51"
        }
      ],
      "title": "drm/nouveau: fix a use-after-free in nouveau_gem_prime_import_sg_table()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50454",
    "datePublished": "2025-10-01T11:45:27.337Z",
    "dateReserved": "2025-10-01T11:38:45.640Z",
    "dateUpdated": "2026-08-05T08:58:51.159Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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