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CVE-2022-48771 (GCVE-0-2022-48771)

Vulnerability from cvelistv5 – Published: 2024-06-20 11:13 – Updated: 2026-08-05 08:52
VLAI
Title
drm/vmwgfx: Fix stale file descriptors on failed usercopy
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/vmwgfx: Fix stale file descriptors on failed usercopy A failing usercopy of the fence_rep object will lead to a stale entry in the file descriptor table as put_unused_fd() won't release it. This enables userland to refer to a dangling 'file' object through that still valid file descriptor, leading to all kinds of use-after-free exploitation scenarios. Fix this by deferring the call to fd_install() until after the usercopy has succeeded.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 17:09 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c906965dee22d5e95d0651759ba107b420212a9f , < e8d092a62449dcfc73517ca43963d2b8f44d0516 (git)
Affected: c906965dee22d5e95d0651759ba107b420212a9f , < 0008a0c78fc33a84e2212a7c04e6b21a36ca6f4d (git)
Affected: c906965dee22d5e95d0651759ba107b420212a9f , < 84b1259fe36ae0915f3d6ddcea6377779de48b82 (git)
Affected: c906965dee22d5e95d0651759ba107b420212a9f , < ae2b20f27732fe92055d9e7b350abc5cdf3e2414 (git)
Affected: c906965dee22d5e95d0651759ba107b420212a9f , < 6066977961fc6f437bc064f628cf9b0e4571c56c (git)
Affected: c906965dee22d5e95d0651759ba107b420212a9f , < 1d833b27fb708d6fdf5de9f6b3a8be4bd4321565 (git)
Affected: c906965dee22d5e95d0651759ba107b420212a9f , < a0f90c8815706981c483a652a6aefca51a5e191c (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.14
Unaffected: 0 , < 4.14 (semver)
Unaffected: 4.14.264 , ≤ 4.14.* (semver)
Unaffected: 4.19.227 , ≤ 4.19.* (semver)
Unaffected: 5.4.175 , ≤ 5.4.* (semver)
Unaffected: 5.10.95 , ≤ 5.10.* (semver)
Unaffected: 5.15.18 , ≤ 5.15.* (semver)
Unaffected: 5.16.4 , ≤ 5.16.* (semver)
Unaffected: 5.17 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.14.*",
                  "status": "unaffected",
                  "version": "4.14.264",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.19.*",
                  "status": "unaffected",
                  "version": "4.19.227",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.4.*",
                  "status": "unaffected",
                  "version": "5.4.175",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.95",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.18",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.16.*",
                  "status": "unaffected",
                  "version": "5.16.4",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "5.17",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.14.264",
                      "versionStartIncluding": "4.14",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.19.227",
                      "versionStartIncluding": "4.14",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.4.175",
                      "versionStartIncluding": "4.14",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.95",
                      "versionStartIncluding": "4.14",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.18",
                      "versionStartIncluding": "4.14",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.16.4",
                      "versionStartIncluding": "4.14",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.17",
                      "versionStartIncluding": "4.14",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vmwgfx: Fix stale file descriptors on failed usercopy\n\nA failing usercopy of the fence_rep object will lead to a stale entry in\nthe file descriptor table as put_unused_fd() won\u0027t release it. This\nenables userland to refer to a dangling \u0027file\u0027 object through that still\nvalid file descriptor, leading to all kinds of use-after-free\nexploitation scenarios.\n\nFix this by deferring the call to fd_install() until after the usercopy\nhas succeeded."
            }
          ],
          "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 vulnerability is reached via the local DRM ioctl DRM_IOCTL_VMW_EXECBUF on the vmwgfx device (/dev/dri/renderD* or card*), not via network or adjacent protocols.\nAC:L - An attacker reliably triggers the bug by setting EXPORT_FENCE_FD and passing an invalid fence_rep userspace pointer so copy_to_user fails after fd_install; no race or external condition is required.\nPR:L - VMW_EXECBUF is DRM_RENDER_ALLOW on a DRIVER_RENDER device, so an unprivileged local user who can open the render node (no DRM master/auth) can invoke the path.\nUI:N - Exploitation requires only the attacker\u0027s own ioctl; no victim action is needed.\nS:U - Impact is local kernel memory corruption / privilege escalation within the same OS security authority; this is not a VM escape or cross-boundary break of vmwgfx\u0027s guest GPU interface.\nC:H - The stale FD yields a use-after-free on struct file that can be reclaimed and abused for arbitrary kernel memory disclosure.\nI:H - The same struct file UAF enables heap manipulation and arbitrary write / control-flow hijacking as described in the fix commit.\nA:H - Use-after-free of the file object can cause kernel oops/panic even without a full exploit, so availability impact is high."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T08:52:12.077Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/e8d092a62449dcfc73517ca43963d2b8f44d0516"
            },
            {
              "url": "https://git.kernel.org/stable/c/0008a0c78fc33a84e2212a7c04e6b21a36ca6f4d"
            },
            {
              "url": "https://git.kernel.org/stable/c/84b1259fe36ae0915f3d6ddcea6377779de48b82"
            },
            {
              "url": "https://git.kernel.org/stable/c/ae2b20f27732fe92055d9e7b350abc5cdf3e2414"
            },
            {
              "url": "https://git.kernel.org/stable/c/6066977961fc6f437bc064f628cf9b0e4571c56c"
            },
            {
              "url": "https://git.kernel.org/stable/c/1d833b27fb708d6fdf5de9f6b3a8be4bd4321565"
            },
            {
              "url": "https://git.kernel.org/stable/c/a0f90c8815706981c483a652a6aefca51a5e191c"
            }
          ],
          "title": "drm/vmwgfx: Fix stale file descriptors on failed usercopy",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2022-48771",
        "datePublished": "2024-06-20T11:13:45.896Z",
        "dateReserved": "2024-06-20T11:09:39.061Z",
        "dateUpdated": "2026-08-05T08:52:12.077Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.





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.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.