{
  "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-2026-23398",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-23398",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-03-26T10:22:50.606Z",
    "updatedAt": "2026-10-15T01:14:50.052Z",
    "importedAt": "2026-10-24T01:58:02.025Z",
    "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": "icmp: fix NULL pointer dereference in icmp_tag_validation()",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nicmp: fix NULL pointer dereference in icmp_tag_validation()\n\nicmp_tag_validation() unconditionally dereferences the result of\nrcu_dereference(inet_protos[proto]) without checking for NULL.\nThe inet_protos[] array is sparse -- only about 15 of 256 protocol\nnumbers have registered handlers. When ip_no_pmtu_disc is set to 3\n(hardened PMTU mode) and the kernel receives an ICMP Fragmentation\nNeeded error with a quoted inner IP header containing an unregistered\nprotocol number, the NULL dereference causes a kernel panic in\nsoftirq context.\n\n Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] SMP KASAN NOPTI\n KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]\n RIP: 0010:icmp_unreach (net/ipv4/icmp.c:1085 net/ipv4/icmp.c:1143)\n Call Trace:\n  <IRQ>\n  icmp_rcv (net/ipv4/icmp.c:1527)\n  ip_protocol_deliver_rcu (net/ipv4/ip_input.c:207)\n  ip_local_deliver_finish (net/ipv4/ip_input.c:242)\n  ip_local_deliver (net/ipv4/ip_input.c:262)\n  ip_rcv (net/ipv4/ip_input.c:573)\n  __netif_receive_skb_one_core (net/core/dev.c:6164)\n  process_backlog (net/core/dev.c:6628)\n  handle_softirqs (kernel/softirq.c:561)\n  </IRQ>\n\nAdd a NULL check before accessing icmp_strict_tag_validation. If the\nprotocol has no registered handler, return false since it cannot\nperform strict tag validation.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e",
              "status": "affected",
              "versionType": "git",
              "lessThan": "571d9d7b650f02d1e38c01128817868bceac9edd"
            },
            {
              "version": "8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e",
              "status": "affected",
              "versionType": "git",
              "lessThan": "d783fa413c702ff0f8f8bea63f862e28eeaf39e3"
            },
            {
              "version": "8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e",
              "status": "affected",
              "versionType": "git",
              "lessThan": "1f9f2c6d4b2a613b7756fc5679c5116ba2ca0161"
            },
            {
              "version": "8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e",
              "status": "affected",
              "versionType": "git",
              "lessThan": "b61529c357f1ee4d64836eb142a542d2e7ad67ce"
            },
            {
              "version": "8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e",
              "status": "affected",
              "versionType": "git",
              "lessThan": "9647e99d2a617c355d2b378be0ff6d0e848fd579"
            },
            {
              "version": "8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e",
              "status": "affected",
              "versionType": "git",
              "lessThan": "d938dd5a0ad780c891ea3bc94cae7405f11e618a"
            },
            {
              "version": "8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e",
              "status": "affected",
              "versionType": "git",
              "lessThan": "1e4e2f5e48cec0cccaea9815fb9486c084ba41e2"
            },
            {
              "version": "8ed1dc44d3e9e8387a104b1ae8f92e9a3fbf1b1e",
              "status": "affected",
              "versionType": "git",
              "lessThan": "614aefe56af8e13331e50220c936fc0689cf5675"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "3.14",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "3.14"
            },
            {
              "version": "5.10.253",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.203",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.167",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.130",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.78",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.20",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "6.19.10",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.19.*"
            },
            {
              "version": "7.0",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}