{"id":"CVE-2025-68313","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nx86/CPU/AMD: Add RDSEED fix for Zen5\n\nThere's an issue with RDSEED's 16-bit and 32-bit register output\nvariants on Zen5 which return a random value of 0 \"at a rate inco…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nx86/CPU/AMD: Add RDSEED fix for Zen5\n\nThere's an issue with RDSEED's 16-bit and 32-bit register output\nvariants on Zen5 which return a random value of 0 \"at a rate inco…","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-338"],"vendor":"Linux","product":"Linux","affected":["Linux >= 3e4147f33f8b647775357bae0248b9a2aeebfcd2 < e980de2ff109dacb6d9d3a77f01b27c467115ecb","Linux >= 3e4147f33f8b647775357bae0248b9a2aeebfcd2 < 36ff93e66d0efc46e39fab536a9feec968daa766","Linux >= 3e4147f33f8b647775357bae0248b9a2aeebfcd2 < 607b9fb2ce248cc5b633c5949e0153838992c152","Linux 5953e7a89966fc5a42124a08ba33a9c57ba5173c","Linux >= 6.6.156 < 6.7","Linux 6.8"],"published":"2025-12-16","updated":"2026-10-15","sourceUpdated":"2026-10-15T22:19:11.873","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-68313","references":[{"url":"https://git.kernel.org/stable/c/36ff93e66d0efc46e39fab536a9feec968daa766","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/607b9fb2ce248cc5b633c5949e0153838992c152","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e980de2ff109dacb6d9d3a77f01b27c467115ecb","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68313.json"},{"url":"https://access.redhat.com/security/cve/CVE-2025-68313"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2422831"},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-68313"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-68313"},{"url":"https://lore.kernel.org/linux-cve-announce/2025121654-CVE-2025-68313-c65d@gregkh/T"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00139,"epssPercentile":0.03245,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-15T22:00:51.579306Z"},"scores":{"nvd":7.1,"vendor":5.5},"ingestedAt":"2026-09-02T13:44:41.298Z","slug":"CVE-2025-68313","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nx86/CPU/AMD: Add RDSEED fix for Zen5\n\nThere's an issue with RDSEED's 16-bit and 32-bit register output\nvariants on Zen5 which return a random value of 0 \"at a rate inconsistent\nwith randomness while incorrectly signaling success (CF=1)\". Search the\nweb for AMD-SB-7055 for more detail.\n\nAdd a fix glue which checks microcode revisions.\n\n  [ bp: Add microcode revisions checking, rewrite. ]\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · updated 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68313.json)","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}