{"api_version":"1","generated_at":"2026-07-24T20:14:57+00:00","cve":"CVE-2026-63855","urls":{"html":"https://cve.report/CVE-2026-63855","api":"https://cve.report/api/cve/CVE-2026-63855.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-63855","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-63855"},"summary":{"title":"drm/amdgpu/vcn: set no_user_fence for VCN v2.5 enc/dec rings","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu/vcn: set no_user_fence for VCN v2.5 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 efc9dd5590894109bce9a0bfe1fa5592dd6b20b1)","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 15:16:52","updated_at":"2026-07-20 15:16:51"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"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"}}],"references":[{"url":"https://git.kernel.org/stable/c/4f317863a3ab212a027d8c8c3cc3af4e3fb95704","name":"https://git.kernel.org/stable/c/4f317863a3ab212a027d8c8c3cc3af4e3fb95704","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5a3c6f76cab164a5d803084908d7050f649ab7f9","name":"https://git.kernel.org/stable/c/5a3c6f76cab164a5d803084908d7050f649ab7f9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8f0ea4524dc71c6c9ec97f2711f46e12f624140f","name":"https://git.kernel.org/stable/c/8f0ea4524dc71c6c9ec97f2711f46e12f624140f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/602d4c5872b25ddd4d82fb2025efb9a05b187bb3","name":"https://git.kernel.org/stable/c/602d4c5872b25ddd4d82fb2025efb9a05b187bb3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2c6fb056567efb49f8674108b86088a1cfaa86d0","name":"https://git.kernel.org/stable/c/2c6fb056567efb49f8674108b86088a1cfaa86d0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-63855","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63855","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 28c17d72072b7ce5cc13a527dcbfc045cc995e7d 2c6fb056567efb49f8674108b86088a1cfaa86d0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 28c17d72072b7ce5cc13a527dcbfc045cc995e7d 8f0ea4524dc71c6c9ec97f2711f46e12f624140f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 28c17d72072b7ce5cc13a527dcbfc045cc995e7d 602d4c5872b25ddd4d82fb2025efb9a05b187bb3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 28c17d72072b7ce5cc13a527dcbfc045cc995e7d 5a3c6f76cab164a5d803084908d7050f649ab7f9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 28c17d72072b7ce5cc13a527dcbfc045cc995e7d 4f317863a3ab212a027d8c8c3cc3af4e3fb95704 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.4","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.4 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.141 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.91 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.33 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.10 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"63855","cve":"CVE-2026-63855","epss":"0.001570000","percentile":"0.052670000","score_date":"2026-07-20","updated_at":"2026-07-21 00:13:14"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/gpu/drm/amd/amdgpu/vcn_v2_5.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"2c6fb056567efb49f8674108b86088a1cfaa86d0","status":"affected","version":"28c17d72072b7ce5cc13a527dcbfc045cc995e7d","versionType":"git"},{"lessThan":"8f0ea4524dc71c6c9ec97f2711f46e12f624140f","status":"affected","version":"28c17d72072b7ce5cc13a527dcbfc045cc995e7d","versionType":"git"},{"lessThan":"602d4c5872b25ddd4d82fb2025efb9a05b187bb3","status":"affected","version":"28c17d72072b7ce5cc13a527dcbfc045cc995e7d","versionType":"git"},{"lessThan":"5a3c6f76cab164a5d803084908d7050f649ab7f9","status":"affected","version":"28c17d72072b7ce5cc13a527dcbfc045cc995e7d","versionType":"git"},{"lessThan":"4f317863a3ab212a027d8c8c3cc3af4e3fb95704","status":"affected","version":"28c17d72072b7ce5cc13a527dcbfc045cc995e7d","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/gpu/drm/amd/amdgpu/vcn_v2_5.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.4"},{"lessThan":"5.4","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":"5.4","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.91","versionStartIncluding":"5.4","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.33","versionStartIncluding":"5.4","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.10","versionStartIncluding":"5.4","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"5.4","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 v2.5 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 efc9dd5590894109bce9a0bfe1fa5592dd6b20b1)"}],"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":"2026-07-20T13:40:52.507Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/2c6fb056567efb49f8674108b86088a1cfaa86d0"},{"url":"https://git.kernel.org/stable/c/8f0ea4524dc71c6c9ec97f2711f46e12f624140f"},{"url":"https://git.kernel.org/stable/c/602d4c5872b25ddd4d82fb2025efb9a05b187bb3"},{"url":"https://git.kernel.org/stable/c/5a3c6f76cab164a5d803084908d7050f649ab7f9"},{"url":"https://git.kernel.org/stable/c/4f317863a3ab212a027d8c8c3cc3af4e3fb95704"}],"title":"drm/amdgpu/vcn: set no_user_fence for VCN v2.5 enc/dec rings","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-63855","datePublished":"2026-07-19T14:04:45.096Z","dateReserved":"2026-07-19T07:54:57.016Z","dateUpdated":"2026-07-20T13:40:52.507Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-19 15:16:52","lastModifiedDate":"2026-07-20 15:16:51","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"63855","Ordinal":"1","Title":"drm/amdgpu/vcn: set no_user_fence for VCN v2.5 enc/dec rings","CVE":"CVE-2026-63855","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"63855","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu/vcn: set no_user_fence for VCN v2.5 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 efc9dd5590894109bce9a0bfe1fa5592dd6b20b1)","Type":"Description","Title":"drm/amdgpu/vcn: set no_user_fence for VCN v2.5 enc/dec rings"}]}}}