{"cve":"CVE-2026-63855","nvd":{"published":"2026-07-19T15:16:52.337","modified":"2026-10-19T20:19:24.927","status":"Undergoing Analysis","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)","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-20"],"references":["https://git.kernel.org/stable/c/2c6fb056567efb49f8674108b86088a1cfaa86d0","https://git.kernel.org/stable/c/4f317863a3ab212a027d8c8c3cc3af4e3fb95704","https://git.kernel.org/stable/c/5a3c6f76cab164a5d803084908d7050f649ab7f9","https://git.kernel.org/stable/c/602d4c5872b25ddd4d82fb2025efb9a05b187bb3","https://git.kernel.org/stable/c/8f0ea4524dc71c6c9ec97f2711f46e12f624140f"],"products":[],"source":"nvd","synced_at":"2026-10-21T03:43:09.190223697+00:00"},"epss":{"cve":"CVE-2026-63855","score":0.00175,"percentile":0.06969,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}