{
  "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-2026-98103",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-98103",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-09-25T10:35:53.942Z",
    "updatedAt": "2026-10-21T12:54:31.184Z",
    "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": "igmp: convert struct ip_sf_list to RCU",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nigmp: convert struct ip_sf_list to RCU\n\nCommit 23d2b94043ca (\"igmp: Add ip_mc_list lock in ip_check_mc_rcu\")\nadded spin_lock_bh(&im->lock) to ip_check_mc_rcu() to prevent a\nuse-after-free while iterating im->sources during concurrent deletions.\n\nHowever, ip_check_mc_rcu() is called from RCU read-side critical\nsections in packet receive and route lookup fast paths (e.g.\n__mkroute_output(), ip_route_input_rcu(), and __udp4_lib_rcv()).\n\nWhen igmpv3_send_cr() or igmpv3_send_report() holds &pmc->lock and\ncalls add_grec() -> igmpv3_newpack() -> ip_route_output_ports(),\nan XFRM policy matching a multicast destination triggers\nxfrm_tmpl_resolve_one() -> xfrm4_get_saddr() -> __mkroute_output() ->\nip_check_mc_rcu(). This attempts to acquire &im->lock while &pmc->lock\nis already held on the same CPU, triggering a lockdep recursive locking\nwarning / deadlock.\n\nFix this by converting IPv4 struct ip_sf_list to RCU, mirroring the\nIPv6 implementation in net/ipv6/mcast.c:\n\n1. Add struct rcu_head to struct ip_sf_list and annotate sf_next,\n   sources, and tomb as __rcu pointers.\n2. Use rcu_assign_pointer() and kfree_rcu() for list updates and\n   deletions.\n3. Remove spin_lock_bh(&im->lock) from ip_check_mc_rcu() and traverse\n   im->sources locklessly with for_each_psf_rcu(), reading and writing\n   counter fields with READ_ONCE() and WRITE_ONCE().\n\nNote: RCU conversion of /proc/net/mcfilter will be done in a\nseparate patch.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "23d2b94043ca8835bd1e67749020e839f396a1c2",
              "status": "affected",
              "versionType": "git",
              "lessThan": "01131daffc4b64f1652e23dc3e6e2f601eda781d"
            },
            {
              "version": "23d2b94043ca8835bd1e67749020e839f396a1c2",
              "status": "affected",
              "versionType": "git",
              "lessThan": "f5182dfad54277267a8cb0c004a9cd4cf35aeebb"
            },
            {
              "version": "23d2b94043ca8835bd1e67749020e839f396a1c2",
              "status": "affected",
              "versionType": "git",
              "lessThan": "d3011d1f293478c730aa0870490afa145c37600e"
            },
            {
              "version": "23d2b94043ca8835bd1e67749020e839f396a1c2",
              "status": "affected",
              "versionType": "git",
              "lessThan": "e3206419bdb04e2087d8cc6be324df8639b3fac5"
            },
            {
              "version": "23d2b94043ca8835bd1e67749020e839f396a1c2",
              "status": "affected",
              "versionType": "git",
              "lessThan": "2987ee196c88dbde0463dc87d5fb209c684e34a2"
            },
            {
              "version": "b24065948ae6c48c9e20891f8cfe9850f1d748be",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "e9924c4204ede999b0515fd31a370a1e27f676bc",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "78967749984cf3614de346c90f3e259ff8272735",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "4768973dffed4d0126854514335ed4fe87bec1ab",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "d84708451d9041dff8a81e3718f821f12d2eb6c5",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "ddd7e8b7b84836c584a284b98ca9bd7a348a0558",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "961447ff60291b91e27d5c32fa549c1411ad3b70",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "d1a3c6d5925a8d00a32c5ef2d674dd9c0ce89c95",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "4.4.284",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "4.5"
            },
            {
              "version": "4.9.283",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "4.10"
            },
            {
              "version": "4.14.247",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "4.15"
            },
            {
              "version": "4.19.207",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "4.20"
            },
            {
              "version": "5.4.145",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.5"
            },
            {
              "version": "5.10.64",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.11"
            },
            {
              "version": "5.13.16",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.14"
            },
            {
              "version": "5.14.3",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.15"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "5.15",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "5.15"
            },
            {
              "version": "6.6.160",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.111",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.53",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.2.7",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "version": "7.3",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}