CVE-2025-68313 (GCVE-0-2025-68313)
Vulnerability from cvelistv5
Published
2025-12-16 15:39
Modified
2026-08-05 12:10
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Summary
In the Linux kernel, the following vulnerability has been resolved: x86/CPU/AMD: Add RDSEED fix for Zen5 There's an issue with RDSEED's 16-bit and 32-bit register output variants on Zen5 which return a random value of 0 "at a rate inconsistent with randomness while incorrectly signaling success (CF=1)". Search the web for AMD-SB-7055 for more detail. Add a fix glue which checks microcode revisions. [ bp: Add microcode revisions checking, rewrite. ]
References
Impacted products
Vendor Product Version
Linux Linux Version: 3e4147f33f8b647775357bae0248b9a2aeebfcd2
Version: 3e4147f33f8b647775357bae0248b9a2aeebfcd2
Version: 3e4147f33f8b647775357bae0248b9a2aeebfcd2
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kernel/cpu/amd.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "lessThan": "e980de2ff109dacb6d9d3a77f01b27c467115ecb",
              "status": "affected",
              "version": "3e4147f33f8b647775357bae0248b9a2aeebfcd2",
              "versionType": "git"
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              "status": "affected",
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              "versionType": "git"
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            {
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              "status": "affected",
              "version": "3e4147f33f8b647775357bae0248b9a2aeebfcd2",
              "versionType": "git"
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          "product": "Linux",
          "programFiles": [
            "arch/x86/kernel/cpu/amd.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.8"
            },
            {
              "lessThan": "6.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.58",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.58",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17.8",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
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                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/CPU/AMD: Add RDSEED fix for Zen5\n\nThere\u0027s an issue with RDSEED\u0027s 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. ]"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The affected RDSEED forms are directly executable by local user-space code; no syscall or network packet directly reaches the primitive.\nAC:L - An attacker can create the demonstrated RDSEED and memory-pressure workload using concurrent threads, so the triggering conditions are attacker-controlled.\nPR:L - An ordinary unprivileged process can execute RDSEED and induce contention without capabilities, root access, or namespace privileges.\nUI:N - Exploitation requires no action by a human victim once affected software consumes RDSEED-derived entropy.\nS:U - The impact remains within the affected host or guest security authority, with no demonstrated guest-to-host escape or other scope crossing.\nC:H - Predictable seed material can compromise cryptographic private keys, session keys, or nonces, potentially exposing all data protected by them.\nI:H - Compromised signing, authentication, or encryption keys can enable impersonation, forgery, and unauthorized modification of protected data.\nA:N - The flaw degrades entropy but does not directly corrupt memory, crash the kernel, hang execution, or exhaust resources."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:10:47.700Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e980de2ff109dacb6d9d3a77f01b27c467115ecb"
        },
        {
          "url": "https://git.kernel.org/stable/c/36ff93e66d0efc46e39fab536a9feec968daa766"
        },
        {
          "url": "https://git.kernel.org/stable/c/607b9fb2ce248cc5b633c5949e0153838992c152"
        }
      ],
      "title": "x86/CPU/AMD: Add RDSEED fix for Zen5",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68313",
    "datePublished": "2025-12-16T15:39:43.972Z",
    "dateReserved": "2025-12-16T14:48:05.295Z",
    "dateUpdated": "2026-08-05T12:10:47.700Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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