FKIE_CVE-2026-64046

Vulnerability from fkie_nvd - Published: 2026-07-19 16:17 - Updated: 2026-07-20 15:17
Severity
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net: tls: prevent chain-after-chain in plain text SG Sashiko points out that if end = 0 (start != 0) the current code will create a chain link to content type right after the wrap link: This would create a chain where the wrap link points directly to another chain link. The scatterlist API sg_next iterator does not recursively resolve consecutive chain links. meaning this is illegal input to crypto. The wrapping link is unnecessary if end = 0. end is the entry after the last one used so end = 0 means there's nothing pushed after the wrap: end start i v v v [ ]...[ ][ d ][ d ][ d ][ d ][rsv for wrap] Skip the wrapping in this case. TLS 1.3 can use the "wrapping slot" for it's chaining if end = 0. This avoids the chain-after-chain. Move the wrap chaining before marking END and chaining off content type, that feels like more logical ordering to me, but should not matter from functional perspective.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/410351158dfef2d67fea6603680b3a6013c6ed9d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/49a5faaa471ddcd37b6893970c9916eb836e7c31
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/91359966e247c0244c66d50bbb8e74aefa4321c3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/929b1548e63ac72e104c07d8ee8cbbeeba2fa89a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/acdc12b71c9aa4be5dcd2c8062753c6d2033e235
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/af855f4c966afafef74faf8390c7b86568c0d46d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b9c015ef1a7bf1e8dc67f21c6381f36deb2c3a36
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ff26a0e8377dec07e4a7230db7675bed1b9a6d03
Impacted products
Vendor Product Version
To clipboard 

{
  "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"
    }
  ],
  "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\u0027s 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\u0027s 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": "2026-07-20T15:17:05.287",
  "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",
      "url": "https://git.kernel.org/stable/c/410351158dfef2d67fea6603680b3a6013c6ed9d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/49a5faaa471ddcd37b6893970c9916eb836e7c31"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/91359966e247c0244c66d50bbb8e74aefa4321c3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/929b1548e63ac72e104c07d8ee8cbbeeba2fa89a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/acdc12b71c9aa4be5dcd2c8062753c6d2033e235"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/af855f4c966afafef74faf8390c7b86568c0d46d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b9c015ef1a7bf1e8dc67f21c6381f36deb2c3a36"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ff26a0e8377dec07e4a7230db7675bed1b9a6d03"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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