cve-2026-64046

{
  "cvss": 9.8,
  "datePublished": "2026-07-19T16:17:44.920",
  "dateUpdated": "2026-09-02T21:11:12.280",
  "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: tls: prevent chain-after-chain in plain text SG\n\nSashiko points out that if end = 0 (start != 0) the current\ncode will create a chain link to content type right after\nthe wrap link:\n\n  This would create a chain where the wrap link points directly\n  to another chain link. The scatterlist API sg_next iterator\n  does not recursively resolve consecutive chain links.\n\nmeaning this is illegal input to crypto.\n\nThe wrapping link is unnecessary if end = 0. end is the entry after\nthe last one used so end = 0 means there's nothing pushed after\nthe wrap:\n\n   end         start            i\n    v            v              v\n  [   ]...[   ][ d ][ d ][ d ][ d ][rsv for wrap]\n\nSkip the wrapping in this case.\n\nTLS 1.3 can use the \"wrapping slot\" for it's chaining if end = 0.\nThis avoids the chain-after-chain.\n\nMove the wrap chaining before marking END and chaining off content\ntype, that feels like more logical ordering to me, but should not\nmatter from functional perspective.",
  "id": "CVE-2026-64046",
  "raw": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "Linux",
            "programFiles": [
              "net/tls/tls_sw.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "lessThan": "49a5faaa471ddcd37b6893970c9916eb836e7c31",
                "status": "affected",
                "version": "9aaaa56845a06aeabdd597cbe19492dc01f281ec",
                "versionType": "git"
              },
              {
                "lessThan": "91359966e247c0244c66d50bbb8e74aefa4321c3",
                "status": "affected",
                "version": "9aaaa56845a06aeabdd597cbe19492dc01f281ec",
                "versionType": "git"
              },
              {
                "lessThan": "410351158dfef2d67fea6603680b3a6013c6ed9d",
                "status": "affected",
                "version": "9aaaa56845a06aeabdd597cbe19492dc01f281ec",
                "versionType": "git"
              },
              {
                "lessThan": "acdc12b71c9aa4be5dcd2c8062753c6d2033e235",
                "status": "affected",
                "version": "9aaaa56845a06aeabdd597cbe19492dc01f281ec",
                "versionType": "git"
              },
              {
                "lessThan": "929b1548e63ac72e104c07d8ee8cbbeeba2fa89a",
                "status": "affected",
                "version": "9aaaa56845a06aeabdd597cbe19492dc01f281ec",
                "versionType": "git"
              },
              {
                "lessThan": "af855f4c966afafef74faf8390c7b86568c0d46d",
                "status": "affected",
                "version": "9aaaa56845a06aeabdd597cbe19492dc01f281ec",
                "versionType": "git"
              },
              {
                "lessThan": "b9c015ef1a7bf1e8dc67f21c6381f36deb2c3a36",
                "status": "affected",
                "version": "9aaaa56845a06aeabdd597cbe19492dc01f281ec",
                "versionType": "git"
              },
              {
                "lessThan": "ff26a0e8377dec07e4a7230db7675bed1b9a6d03",
                "status": "affected",
                "version": "9aaaa56845a06aeabdd597cbe19492dc01f281ec",
                "versionType": "git"
              },
              {
                "status": "affected",
                "version": "d529d6c9f7e3aaeac13c4948f79799ccb825f29d",
                "versionType": "git"
              },
              {
                "lessThan": "5.5",
                "status": "affected",
                "version": "5.4.14",
                "versionType": "semver"
              }
            ]
          },
          {
            "defaultStatus": "affected",
            "product": "Linux",
            "programFiles": [
              "net/tls/tls_sw.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "status": "affected",
                "version": "5.5"
              },
              {
                "lessThan": "5.5",
                "status": "unaffected",
                "version": "0",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "5.10.*",
                "status": "unaffected",
                "version": "5.10.258",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "5.15.*",
                "status": "unaffected",
                "version": "5.15.209",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.1.*",
                "status": "unaffected",
                "version": "6.1.175",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.6.*",
                "status": "unaffected",
                "version": "6.6.142",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.12.*",
                "status": "unaffected",
                "version": "6.12.92",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.18.*",
                "status": "unaffected",
                "version": "6.18.34",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "7.0.*",
                "status": "unaffected",
                "version": "7.0.11",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "7.1",
                "versionType": "original_commit_for_fix"
              }
            ]
          }
        ],
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "29027300-C7E0-4C87-A607-355605B77795",
                "versionEndExcluding": "5.5",
                "versionStartIncluding": "5.4.14",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "BE3D8C6B-EEB3-4854-B99E-EC2549DD3071",
                "versionEndExcluding": "5.10.258",
                "versionStartIncluding": "5.5.1",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "919C10A9-7951-4A74-BADD-C135A0A8D8B4",
                "versionEndExcluding": "5.15.209",
                "versionStartIncluding": "5.11",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "92385813-D91D-480D-83A1-F423D2CBB2BA",
                "versionEndExcluding": "6.1.175",
                "versionStartIncluding": "5.16",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "FBFF77B0-526A-4AF1-84D0-ED7187624A67",
                "versionEndExcluding": "6.6.142",
                "versionStartIncluding": "6.2",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "9CB90BD9-95B7-4D7F-9F17-4ECE6CFB66C9",
                "versionEndExcluding": "6.12.92",
                "versionStartIncluding": "6.7",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "A4B1EF6D-18D7-4838-BC37-7499D5DCC3C0",
                "versionEndExcluding": "6.18.34",
                "versionStartIncluding": "6.13",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "0520D091-FC52-4A50-AF07-70AE7D08B750",
                "versionEndExcluding": "7.0.11",
                "versionStartIncluding": "6.19",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:5.5:-:*:*:*:*:*:*",
                "matchCriteriaId": "EE98F46A-F7D9-4609-B6A0-882E7F0D378C",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:5.5:rc7:*:*:*:*:*:*",
                "matchCriteriaId": "3444D854-CE07-4D25-827A-ECF7BB58EA2D",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*",
                "matchCriteriaId": "B1EF7059-E670-45F4-B422-54C40FA86390",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*",
                "matchCriteriaId": "0D38F0BF-A728-4133-A358-D44A2F7EE6D6",
                "vulnerable": true
              },
              {
                "criteria": "cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*",
                "matchCriteriaId": "EC732D08-5F7B-46D9-B154-E60C7F4F0A97",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: tls: prevent chain-after-chain in plain text SG\n\nSashiko points out that if end = 0 (start != 0) the current\ncode will create a chain link to content type right after\nthe wrap link:\n\n  This would create a chain where the wrap link points directly\n  to another chain link. The scatterlist API sg_next iterator\n  does not recursively resolve consecutive chain links.\n\nmeaning this is illegal input to crypto.\n\nThe wrapping link is unnecessary if end = 0. end is the entry after\nthe last one used so end = 0 means there's nothing pushed after\nthe wrap:\n\n   end         start            i\n    v            v              v\n  [   ]...[   ][ d ][ d ][ d ][ d ][rsv for wrap]\n\nSkip the wrapping in this case.\n\nTLS 1.3 can use the \"wrapping slot\" for it's chaining if end = 0.\nThis avoids the chain-after-chain.\n\nMove the wrap chaining before marking END and chaining off content\ntype, that feels like more logical ordering to me, but should not\nmatter from functional perspective."
      }
    ],
    "id": "CVE-2026-64046",
    "lastModified": "2026-09-02T21:11:12.280",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 5.9,
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "type": "Secondary"
        }
      ]
    },
    "published": "2026-07-19T16:17:44.920",
    "references": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/410351158dfef2d67fea6603680b3a6013c6ed9d"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/49a5faaa471ddcd37b6893970c9916eb836e7c31"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/91359966e247c0244c66d50bbb8e74aefa4321c3"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/929b1548e63ac72e104c07d8ee8cbbeeba2fa89a"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/acdc12b71c9aa4be5dcd2c8062753c6d2033e235"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/af855f4c966afafef74faf8390c7b86568c0d46d"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/b9c015ef1a7bf1e8dc67f21c6381f36deb2c3a36"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "tags": [
          "Patch"
        ],
        "url": "https://git.kernel.org/stable/c/ff26a0e8377dec07e4a7230db7675bed1b9a6d03"
      }
    ],
    "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "NVD-CWE-noinfo"
          }
        ],
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "severity": "CRITICAL",
  "source": "nvd",
  "title": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: tls: prevent chain-after-chain in plain tex..."
}