FKIE_CVE-2026-63912

Vulnerability from fkie_nvd - Published: 2026-07-19 16:17 - Updated: 2026-07-20 15:16
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: xfrm: esp: restore combined single-frag length gate The ESP out-of-place fast path appends the trailer in esp_output_head() before esp_output_tail() allocates the destination page frag. The head-side gate currently checks skb->data_len and tailen separately, but the tail code allocates a single destination frag from the combined post-trailer skb->data_len. Reject the page-frag fast path when the combined aligned length exceeds a page. Otherwise skb_page_frag_refill() may fall back to a single page while the destination sg still spans the combined skb->data_len. Restore this combined-length page gate for both IPv4 and IPv6.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/322e48187e0245ab2fff6fec2220b0cae677dbec
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/36519e3d941fc99d3b52c134dbaf311f987a4708
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/566295735530ee513326049b0540f32ec050bf2e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5d7ab86e2b6bc23054616bf6ac562013bf60af8c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/65f3b3fc2347b89fe21db1e92c7681368415f095
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b84091ceddc9f133229dceab3ccc930bf27f9cba
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c093468aea8277f77272a4f199b2e15e19cabb59
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dfa0d7b0ff1eb6b2c416b8fdb9b4f2cefba57a40
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/esp4.c",
            "net/ipv6/esp6.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "566295735530ee513326049b0540f32ec050bf2e",
              "status": "affected",
              "version": "c075c3ea031757f8ea2d34567565b61a868c08d5",
              "versionType": "git"
            },
            {
              "lessThan": "5d7ab86e2b6bc23054616bf6ac562013bf60af8c",
              "status": "affected",
              "version": "a583f2f3c8788bffd7fd7baeb76bd6d80543d7ea",
              "versionType": "git"
            },
            {
              "lessThan": "36519e3d941fc99d3b52c134dbaf311f987a4708",
              "status": "affected",
              "version": "5bd8baab087dff657e05387aee802e70304cc813",
              "versionType": "git"
            },
            {
              "lessThan": "322e48187e0245ab2fff6fec2220b0cae677dbec",
              "status": "affected",
              "version": "5bd8baab087dff657e05387aee802e70304cc813",
              "versionType": "git"
            },
            {
              "lessThan": "b84091ceddc9f133229dceab3ccc930bf27f9cba",
              "status": "affected",
              "version": "5bd8baab087dff657e05387aee802e70304cc813",
              "versionType": "git"
            },
            {
              "lessThan": "c093468aea8277f77272a4f199b2e15e19cabb59",
              "status": "affected",
              "version": "5bd8baab087dff657e05387aee802e70304cc813",
              "versionType": "git"
            },
            {
              "lessThan": "65f3b3fc2347b89fe21db1e92c7681368415f095",
              "status": "affected",
              "version": "5bd8baab087dff657e05387aee802e70304cc813",
              "versionType": "git"
            },
            {
              "lessThan": "dfa0d7b0ff1eb6b2c416b8fdb9b4f2cefba57a40",
              "status": "affected",
              "version": "5bd8baab087dff657e05387aee802e70304cc813",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2c66b0c95bb0aa7652ba1eba293d0d5993b35a38",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "ef6f83df1209a7d9bd1c605a62457d4c00f9179e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3defefd22ad5fbbe639b6157fb7e6311b2bf333d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b657030870bb5351c5b1e84d4e9f186da6ca0496",
              "versionType": "git"
            },
            {
              "lessThan": "5.10.259",
              "status": "affected",
              "version": "5.10.113",
              "versionType": "semver"
            },
            {
              "lessThan": "5.15.210",
              "status": "affected",
              "version": "5.15.36",
              "versionType": "semver"
            },
            {
              "lessThan": "4.15",
              "status": "affected",
              "version": "4.14.288",
              "versionType": "semver"
            },
            {
              "lessThan": "4.20",
              "status": "affected",
              "version": "4.19.252",
              "versionType": "semver"
            },
            {
              "lessThan": "5.5",
              "status": "affected",
              "version": "5.4.205",
              "versionType": "semver"
            },
            {
              "lessThan": "5.18",
              "status": "affected",
              "version": "5.17.5",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/esp4.c",
            "net/ipv6/esp6.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.18"
            },
            {
              "lessThan": "5.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.259",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.210",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.176",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.93",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.35",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.12",
              "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\nxfrm: esp: restore combined single-frag length gate\n\nThe ESP out-of-place fast path appends the trailer in esp_output_head()\nbefore esp_output_tail() allocates the destination page frag. The\nhead-side gate currently checks skb-\u003edata_len and tailen separately, but\nthe tail code allocates a single destination frag from the combined\npost-trailer skb-\u003edata_len.\n\nReject the page-frag fast path when the combined aligned length exceeds a\npage. Otherwise skb_page_frag_refill() may fall back to a single page while\nthe destination sg still spans the combined skb-\u003edata_len.\n\nRestore this combined-length page gate for both IPv4 and IPv6."
    }
  ],
  "id": "CVE-2026-63912",
  "lastModified": "2026-07-20T15:16:55.280",
  "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": "2026-07-19T16:17:09.097",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/322e48187e0245ab2fff6fec2220b0cae677dbec"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/36519e3d941fc99d3b52c134dbaf311f987a4708"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/566295735530ee513326049b0540f32ec050bf2e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5d7ab86e2b6bc23054616bf6ac562013bf60af8c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/65f3b3fc2347b89fe21db1e92c7681368415f095"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b84091ceddc9f133229dceab3ccc930bf27f9cba"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c093468aea8277f77272a4f199b2e15e19cabb59"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/dfa0d7b0ff1eb6b2c416b8fdb9b4f2cefba57a40"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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