CVE-2021-47280 (GCVE-0-2021-47280)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:20 – Updated: 2026-05-11 13:51
VLAI
Title
drm: Fix use-after-free read in drm_getunique()
Summary
In the Linux kernel, the following vulnerability has been resolved: drm: Fix use-after-free read in drm_getunique() There is a time-of-check-to-time-of-use error in drm_getunique() due to retrieving file_priv->master prior to locking the device's master mutex. An example can be seen in the crash report of the use-after-free error found by Syzbot: https://syzkaller.appspot.com/bug?id=148d2f1dfac64af52ffd27b661981a540724f803 In the report, the master pointer was used after being freed. This is because another process had acquired the device's master mutex in drm_setmaster_ioctl(), then overwrote fpriv->master in drm_new_set_master(). The old value of fpriv->master was subsequently freed before the mutex was unlocked. To fix this, we lock the device's master mutex before retrieving the pointer from from fpriv->master. This patch passes the Syzbot reproducer test.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:39 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5acc614ac47465fee6375a9af4740f618830762d , < 17dab9326ff263c62dab1dbac4492e2938a049e4 (git)
Affected: 5acc614ac47465fee6375a9af4740f618830762d , < 7d233ba700ceb593905ea82b42dadb4ec8ef85e9 (git)
Affected: 5acc614ac47465fee6375a9af4740f618830762d , < b246b4c70c1250e7814f409b243000f9c0bf79a3 (git)
Affected: 5acc614ac47465fee6375a9af4740f618830762d , < 491d52e0078860b33b6c14f0a7ac74ca1b603bd6 (git)
Affected: 5acc614ac47465fee6375a9af4740f618830762d , < f773f8cccac13c7e7bbd9182e7996c727742488e (git)
Affected: 5acc614ac47465fee6375a9af4740f618830762d , < b436acd1cf7fac0ba987abd22955d98025c80c2b (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.11
Unaffected: 0 , < 4.11 (semver)
Unaffected: 4.14.237 , ≤ 4.14.* (semver)
Unaffected: 4.19.195 , ≤ 4.19.* (semver)
Unaffected: 5.4.126 , ≤ 5.4.* (semver)
Unaffected: 5.10.44 , ≤ 5.10.* (semver)
Unaffected: 5.12.11 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm: Fix use-after-free read in drm_getunique()\n\nThere is a time-of-check-to-time-of-use error in drm_getunique() due\nto retrieving file_priv-\u003emaster prior to locking the device\u0027s master\nmutex.\n\nAn example can be seen in the crash report of the use-after-free error\nfound by Syzbot:\nhttps://syzkaller.appspot.com/bug?id=148d2f1dfac64af52ffd27b661981a540724f803\n\nIn the report, the master pointer was used after being freed. This is\nbecause another process had acquired the device\u0027s master mutex in\ndrm_setmaster_ioctl(), then overwrote fpriv-\u003emaster in\ndrm_new_set_master(). The old value of fpriv-\u003emaster was subsequently\nfreed before the mutex was unlocked.\n\nTo fix this, we lock the device\u0027s master mutex before retrieving the\npointer from from fpriv-\u003emaster. This patch passes the Syzbot\nreproducer test."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2025-12-18T11:36:26.671Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/17dab9326ff263c62dab1dbac4492e2938a049e4"
            },
            {
              "url": "https://git.kernel.org/stable/c/7d233ba700ceb593905ea82b42dadb4ec8ef85e9"
            },
            {
              "url": "https://git.kernel.org/stable/c/b246b4c70c1250e7814f409b243000f9c0bf79a3"
            },
            {
              "url": "https://git.kernel.org/stable/c/491d52e0078860b33b6c14f0a7ac74ca1b603bd6"
            },
            {
              "url": "https://git.kernel.org/stable/c/f773f8cccac13c7e7bbd9182e7996c727742488e"
            },
            {
              "url": "https://git.kernel.org/stable/c/b436acd1cf7fac0ba987abd22955d98025c80c2b"
            }
          ],
          "title": "drm: Fix use-after-free read in drm_getunique()",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2021-47280",
        "datePublished": "2024-05-21T14:20:06.852Z",
        "dateReserved": "2024-05-21T13:27:52.128Z",
        "dateUpdated": "2025-12-18T11:36:26.671Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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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