{
  "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-2026-43501",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-43501",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-05-21T12:17:49.885Z",
    "updatedAt": "2026-10-19T19:26:38.012Z",
    "importedAt": "2026-10-24T01:58:14.884Z",
    "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": "ipv6: rpl: reserve mac_len headroom when recompressed SRH grows",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: rpl: reserve mac_len headroom when recompressed SRH grows\n\nipv6_rpl_srh_rcv() decompresses an RFC 6554 Source Routing Header, swaps\nthe next segment into ipv6_hdr->daddr, recompresses, then pulls the old\nheader and pushes the new one plus the IPv6 header back.  The\nrecompressed header can be larger than the received one when the swap\nreduces the common-prefix length the segments share with daddr (CmprI=0,\nCmprE>0, seg[0][0] != daddr[0] gives the maximum +8 bytes).\n\npskb_expand_head() was gated on segments_left == 0, so on earlier\nsegments the push consumed unchecked headroom.  Once skb_push() leaves\nfewer than skb->mac_len bytes in front of data,\nskb_mac_header_rebuild()'s call to:\n\n\tskb_set_mac_header(skb, -skb->mac_len);\n\nwill store (data - head) - mac_len into the u16 mac_header field, which\nwraps to ~65530, and the following memmove() writes mac_len bytes ~64KiB\npast skb->head.\n\nA single AF_INET6/SOCK_RAW/IPV6_HDRINCL packet over lo with a two\nsegment type-3 SRH (CmprI=0, CmprE=15) reaches headroom 8 after one\npass; KASAN reports a 14-byte OOB write in ipv6_rthdr_rcv.\n\nFix this by expanding the head whenever the remaining room is less than\nthe push size plus mac_len, and request that much extra so the rebuilt\nMAC header fits afterwards.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3",
              "status": "affected",
              "versionType": "git",
              "lessThan": "bde199c72d319a4e207f88daabc888317504e2fb"
            },
            {
              "version": "8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3",
              "status": "affected",
              "versionType": "git",
              "lessThan": "be1fa0aa9b4fdd5a8b7a61ba520a690a68391e6e"
            },
            {
              "version": "8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3",
              "status": "affected",
              "versionType": "git",
              "lessThan": "0a9e8053f1f8a8e1bfc1dd61ffe67be6c1180402"
            },
            {
              "version": "8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3",
              "status": "affected",
              "versionType": "git",
              "lessThan": "8e8be63465a5e80394c70324603dfea1bfdad48f"
            },
            {
              "version": "8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3",
              "status": "affected",
              "versionType": "git",
              "lessThan": "4babc2d9fda2df43823b85d08a0180b68f1b0854"
            },
            {
              "version": "8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3",
              "status": "affected",
              "versionType": "git",
              "lessThan": "c261d07a80576dc8ccf394ef8f074f8c67a06b37"
            },
            {
              "version": "8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3",
              "status": "affected",
              "versionType": "git",
              "lessThan": "7398ebefbfd4f8a31d4f665a4213302fa995494b"
            },
            {
              "version": "8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3",
              "status": "affected",
              "versionType": "git",
              "lessThan": "9e6bf146b55999a095bb14f73a843942456d1adc"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "5.7",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "5.7"
            },
            {
              "version": "5.10.258",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.209",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.175",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.140",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.86",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.27",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.0.4",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.0.*"
            },
            {
              "version": "7.1",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}