{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2026-98287",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-98287",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-10-06T08:45:47.998Z",
    "updatedAt": "2026-10-19T09:16:58.585Z",
    "importedAt": "2026-10-24T01:58:41.756Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "pppoatm: ensure a writable skb header and linear data",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\npppoatm: ensure a writable skb header and linear data\n\nIn pppoatm_send(), LLC encapsulation checks whether there is sufficient\nheadroom for the 4-byte LLC header, but does not ensure that the skb header\nis writable.\n\nNormal transmit packets passing through ppp_start_xmit() have their header\nunshared via skb_cow_head(). However, packets can also reach pppoatm_send()\nvia PPP channel bridging (PPPIOCBRIDGECHAN) without going through\nppp_start_xmit().\n\nUse skb_cow_head() to ensure both sufficient headroom and a writable\nheader before pushing the LLC header.\n\nWhile at it:\n- Call pskb_may_pull(skb, 1) before inspecting skb->data[0] to prevent\n  out-of-bounds reads on zero-length or non-linear frames (e.g. from\n  bridging).\n- Defer SC_COMP_PROT protocol compression until after pppoatm_may_send()\n  succeeds. This eliminates the temporary skb allocation on admission failure\n  and completely removes the fragile \"undo\" heuristic at the nospace label,\n  avoiding any risk of reading uninitialized headroom or performing an\n  unbalanced skb_push().",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "4cf476ced45d7f12df30a68e833b263e7a2202d1",
              "status": "affected",
              "versionType": "git",
              "lessThan": "208ccc4d08b1897451e9ba01c016bf93ff107966"
            },
            {
              "version": "4cf476ced45d7f12df30a68e833b263e7a2202d1",
              "status": "affected",
              "versionType": "git",
              "lessThan": "e6cd1bba7d113c15c00ac63671213a096fe4d686"
            },
            {
              "version": "4cf476ced45d7f12df30a68e833b263e7a2202d1",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ffc448eb54f5ba80d4212c1e870cdb92b0f709fa"
            },
            {
              "version": "4cf476ced45d7f12df30a68e833b263e7a2202d1",
              "status": "affected",
              "versionType": "git",
              "lessThan": "8e66c5969acd859ba72fb0a7fa895623fc1b3769"
            },
            {
              "version": "4cf476ced45d7f12df30a68e833b263e7a2202d1",
              "status": "affected",
              "versionType": "git",
              "lessThan": "e2f5529b0016db7d34f411408607f5cf395a542e"
            },
            {
              "version": "4cf476ced45d7f12df30a68e833b263e7a2202d1",
              "status": "affected",
              "versionType": "git",
              "lessThan": "30992fe39e65589ed8e000425e088fa74994b811"
            },
            {
              "version": "4cf476ced45d7f12df30a68e833b263e7a2202d1",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ecc7253683a3c55caa868ce0ee530fcb0044bd3c"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "5.11",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "5.11"
            },
            {
              "version": "5.15.222",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.189",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.158",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.112",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.54",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.2.8",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "version": "7.3",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}