Vulnerability-Lookup

GHSA-G8WX-JX25-GCM6

Vulnerability from github – Published: 2026-07-19 15:30 – Updated: 2026-07-20 15:31

Details

In the Linux kernel, the following vulnerability has been resolved:

drm/amdgpu/vcn: set no_user_fence for VCN v2.0 enc/dec rings

VCN encoder and decoder rings do not support 64-bit user fence writes, reject CS submissions with user fences.

(cherry picked from commit e2b5499fca55f1a32960a311bbb62e35891eaf73)

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-63856"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T15:16:52Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu/vcn: set no_user_fence for VCN v2.0 enc/dec rings\n\nVCN encoder and decoder rings do not support 64-bit user fence writes,\nreject CS submissions with user fences.\n\n(cherry picked from commit e2b5499fca55f1a32960a311bbb62e35891eaf73)",
  "id": "GHSA-g8wx-jx25-gcm6",
  "modified": "2026-07-20T15:31:48Z",
  "published": "2026-07-19T15:30:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63856"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5e777bc4cbe928ac0fd95e368fee1540f2ce4db2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8d80b293b41fcb5e9396db93e788b0f4ebcbafb7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ac06ce5cac9e711281585d09d00c6efcd9b86396"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c71aecae98e42dcf2baf462df50b3a2cf1a93fe4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f264019be80de79f84f464846451445923bffea0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-63856 (GCVE-0-2026-63856)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:04 – Updated: 2026-07-20 13:40

Title

drm/amdgpu/vcn: set no_user_fence for VCN v2.0 enc/dec rings

Summary

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu/vcn: set no_user_fence for VCN v2.0 enc/dec rings VCN encoder and decoder rings do not support 64-bit user fence writes, reject CS submissions with user fences. (cherry picked from commit e2b5499fca55f1a32960a311bbb62e35891eaf73)

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux

References

5 references

URL	Tags
https://git.kernel.org/stable/c/f264019be80de79f8…
https://git.kernel.org/stable/c/5e777bc4cbe928ac0…
https://git.kernel.org/stable/c/ac06ce5cac9e71128…
https://git.kernel.org/stable/c/c71aecae98e42dcf2…
https://git.kernel.org/stable/c/8d80b293b41fcb5e9…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1b61de45dfaff00b627e47349a019658e39268b9 , < f264019be80de79f84f464846451445923bffea0 (git) Affected: 1b61de45dfaff00b627e47349a019658e39268b9 , < 5e777bc4cbe928ac0fd95e368fee1540f2ce4db2 (git) Affected: 1b61de45dfaff00b627e47349a019658e39268b9 , < ac06ce5cac9e711281585d09d00c6efcd9b86396 (git) Affected: 1b61de45dfaff00b627e47349a019658e39268b9 , < c71aecae98e42dcf2baf462df50b3a2cf1a93fe4 (git) Affected: 1b61de45dfaff00b627e47349a019658e39268b9 , < 8d80b293b41fcb5e9396db93e788b0f4ebcbafb7 (git)
Linux	Linux	Affected: 5.3 Unaffected: 0 , < 5.3 (semver) Unaffected: 6.6.141 , ≤ 6.6.* (semver) Unaffected: 6.12.91 , ≤ 6.12.* (semver) Unaffected: 6.18.33 , ≤ 6.18.* (semver) Unaffected: 7.0.10 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/vcn_v2_0.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "f264019be80de79f84f464846451445923bffea0",
              "status": "affected",
              "version": "1b61de45dfaff00b627e47349a019658e39268b9",
              "versionType": "git"
            },
            {
              "lessThan": "5e777bc4cbe928ac0fd95e368fee1540f2ce4db2",
              "status": "affected",
              "version": "1b61de45dfaff00b627e47349a019658e39268b9",
              "versionType": "git"
            },
            {
              "lessThan": "ac06ce5cac9e711281585d09d00c6efcd9b86396",
              "status": "affected",
              "version": "1b61de45dfaff00b627e47349a019658e39268b9",
              "versionType": "git"
            },
            {
              "lessThan": "c71aecae98e42dcf2baf462df50b3a2cf1a93fe4",
              "status": "affected",
              "version": "1b61de45dfaff00b627e47349a019658e39268b9",
              "versionType": "git"
            },
            {
              "lessThan": "8d80b293b41fcb5e9396db93e788b0f4ebcbafb7",
              "status": "affected",
              "version": "1b61de45dfaff00b627e47349a019658e39268b9",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/vcn_v2_0.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.3"
            },
            {
              "lessThan": "5.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.141",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.91",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.33",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.141",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.91",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.33",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.10",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu/vcn: set no_user_fence for VCN v2.0 enc/dec rings\n\nVCN encoder and decoder rings do not support 64-bit user fence writes,\nreject CS submissions with user fences.\n\n(cherry picked from commit e2b5499fca55f1a32960a311bbb62e35891eaf73)"
        }
      ],
      "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"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-20T13:40:53.515Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f264019be80de79f84f464846451445923bffea0"
        },
        {
          "url": "https://git.kernel.org/stable/c/5e777bc4cbe928ac0fd95e368fee1540f2ce4db2"
        },
        {
          "url": "https://git.kernel.org/stable/c/ac06ce5cac9e711281585d09d00c6efcd9b86396"
        },
        {
          "url": "https://git.kernel.org/stable/c/c71aecae98e42dcf2baf462df50b3a2cf1a93fe4"
        },
        {
          "url": "https://git.kernel.org/stable/c/8d80b293b41fcb5e9396db93e788b0f4ebcbafb7"
        }
      ],
      "title": "drm/amdgpu/vcn: set no_user_fence for VCN v2.0 enc/dec rings",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63856",
    "datePublished": "2026-07-19T14:04:45.716Z",
    "dateReserved": "2026-07-19T07:54:57.016Z",
    "dateUpdated": "2026-07-20T13:40:53.515Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Action not permitted

GHSA-G8WX-JX25-GCM6

CVE-2026-63856 (GCVE-0-2026-63856)

Tags

Sightings

Nomenclature