CVE-2026-46266 (GCVE-0-2026-46266)

Vulnerability from cvelistv5 – Published: 2026-06-03 15:50 – Updated: 2026-10-19 19:36
VLAI
Title
inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP
Summary
In the Linux kernel, the following vulnerability has been resolved: inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP Yizhou Zhao reported that simply having one RAW socket on protocol IPPROTO_RAW (255) was dangerous. socket(AF_INET, SOCK_RAW, 255); A malicious incoming ICMP packet can set the protocol field to 255 and match this socket, leading to FNHE cache changes. inner = IP(src="192.168.2.1", dst="8.8.8.8", proto=255)/Raw("TEST") pkt = IP(src="192.168.1.1", dst="192.168.2.1")/ICMP(type=3, code=4, nexthopmtu=576)/inner "man 7 raw" states: A protocol of IPPROTO_RAW implies enabled IP_HDRINCL and is able to send any IP protocol that is specified in the passed header. Receiving of all IP protocols via IPPROTO_RAW is not possible using raw sockets. Make sure we drop these malicious packets.
Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:21 UTC
CWE
  • CWE-20 - Improper Input Validation
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7063 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 47276297140ee6712646f9b19fb04fe26daedd01 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < db76b75ede3810e7cf9cfea5067d4f3e0993768b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 19e42490c89bac9a388f28179e66bebbef350f99 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 531c1aec81bfe19d00af13da5531fbb8209e4bd2 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 719d3932b8f6e3348ce2f0ac58e278301fc17575 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c89477ad79446867394360b29bb801010fc3ff22 (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 6.1.187 , ≤ 6.1.* (semver)
Unaffected: 6.6.128 , ≤ 6.6.* (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.14 , ≤ 6.18.* (semver)
Unaffected: 6.19.4 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ninet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP\n\nYizhou Zhao reported that simply having one RAW socket on protocol\nIPPROTO_RAW (255) was dangerous.\n\n  socket(AF_INET, SOCK_RAW, 255);\n\nA malicious incoming ICMP packet can set the protocol field to 255\nand match this socket, leading to FNHE cache changes.\n\ninner = IP(src=\"192.168.2.1\", dst=\"8.8.8.8\", proto=255)/Raw(\"TEST\")\npkt = IP(src=\"192.168.1.1\", dst=\"192.168.2.1\")/ICMP(type=3, code=4, nexthopmtu=576)/inner\n\n\"man 7 raw\" states:\n\n  A protocol of IPPROTO_RAW implies enabled IP_HDRINCL and is able\n  to send any IP protocol that is specified in the passed header.\n  Receiving of all IP protocols via IPPROTO_RAW is not possible\n  using raw sockets.\n\nMake sure we drop these malicious packets."
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            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ninet: Los sockets RAW que usan IPPROTO_RAW DEBEN descartar el ICMP entrante\n\nYizhou Zhao inform\u00f3 que simplemente tener un socket RAW en el protocolo IPPROTO_RAW (255) era peligroso.\n\nsocket(AF_INET, SOCK_RAW, 255);\n\nUn paquete ICMP entrante malicioso puede establecer el campo de protocolo en 255 y coincidir con este socket, lo que lleva a cambios en la cach\u00e9 FNHE.\n\ninner = IP(src=\"192.168.2.1\", dst=\"8.8.8.8\", proto=255)/Raw(\"TEST\")\npkt = IP(src=\"192.168.1.1\", dst=\"192.168.2.1\")/ICMP(type=3, code=4, nexthopmtu=576)/inner\n\n\u0027man 7 raw\u0027 establece:\n\nUn protocolo de IPPROTO_RAW implica IP_HDRINCL habilitado y es capaz de enviar cualquier protocolo IP que se especifica en la cabecera pasada. La recepci\u00f3n de todos los protocolos IP a trav\u00e9s de IPPROTO_RAW no es posible usando sockets raw.\n\nAsegur\u00e9monos de descartar estos paquetes maliciosos."
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        "id": "CVE-2026-46266",
        "lastModified": "2026-10-19T20:18:40.257",
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              "exploitabilityScore": 3.9,
              "impactScore": 5.2,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
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            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-46266",
                "options": [
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                    "exploitation": "none"
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                  {
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                "version": "2.0.3"
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        "references": [
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            "tags": [
              "Patch"
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            "url": "https://git.kernel.org/stable/c/db76b75ede3810e7cf9cfea5067d4f3e0993768b"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
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            "description": [
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                "value": "NVD-CWE-noinfo"
              }
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            "source": "nvd@nist.gov",
            "type": "Primary"
          },
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-20"
              }
            ],
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "type": "Secondary"
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    },
    "redhat_vex": {
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      "current_release_date": "2026-09-17T12:41:20+00:00",
      "cve": "CVE-2026-46266",
      "id": "CVE-2026-46266",
      "initial_release_date": "2026-06-03T00:00:00+00:00",
      "product_status:fixed": "762",
      "product_status:known_affected": "64",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46266.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-10-15T15:03:02Z",
      "cve": "CVE-2026-46266",
      "id": "CVE-2026-46266",
      "initial_release_date": "2026-06-04T02:21:43Z",
      "product_status:known_affected": "507",
      "product_status:recommended": "655",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-46266",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-46266.json",
      "version": "25"
    },
    "vulnrichment": {
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            "metrics": [
              {
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                  "content": {
                    "id": "CVE-2026-46266",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-10-16T15:21:30.816520Z",
                    "version": "2.0.3"
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                    "description": "CWE-20 Improper Input Validation",
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                    "type": "CWE"
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                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-10-16T15:21:31.398Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
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              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
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                "net/ipv6/icmp.c"
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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              "versions": [
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              "vendor": "Linux",
              "versions": [
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                  "version": "2.6.12"
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                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "7.0",
                  "versionType": "original_commit_for_fix"
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            }
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                      "vulnerable": true
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            }
          ],
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                  "value": "AV:N - The bug is reached when a remotely sourced ICMP error (DEST_UNREACH/FRAG_NEEDED or REDIRECT) is received and processed through icmp_rcv() \u2192 icmp_unreach()/icmp_redirect() \u2192 icmp_socket_deliver(), which is standard internet-facing IPv4 input on any host accepting ICMP.\nAC:L - Exploitation is a single, deterministic crafted ICMP packet (inner IP proto=255, attacker-chosen daddr/PMTU) matching an open IPPROTO_RAW socket; an attacker can reliably create that socket via CAP_NET_RAW in a user+network namespace (unshare -Urn) without winning a race.\nPR:N - The network trigger requires no authentication or victim credentials\u2014only delivery of forged ICMP to the target IP; the remote attacker does not need local privileges even though a local IPPROTO_RAW socket must exist on the victim (typically opened by a daemon or a co-resident userns holder).\nUI:N - No victim user action is required beyond normal network operation; the attacker sends ICMP directly to the host without tricking anyone into clicking, mounting, or opening files.\nS:U - Impact is confined to the kernel IPv4 routing/FNHE cache within the same network namespace; it does not cross a VM/hypervisor or IOMMU security boundary.\nC:N - This is a missing validation/logic bug that poisons route-cache metadata (PMTU/gateway); there is no memory read, pointer leak, or information-disclosure primitive.\nI:H - Before the fix, raw_err() unconditionally calls ipv4_sk_update_pmtu()/ipv4_sk_redirect(), letting a remote attacker inject attacker-controlled PMTU and gateway values into the system-wide FNHE exception cache for arbitrary destination addresses, altering forwarding for all local traffic to those destinations.\nA:H - Repeated forged ICMP FRAG_NEEDED packets can persistently force minimum PMTU entries in FNHE for chosen destinations, causing severe throughput collapse and connectivity failure for affected flows across the entire host or shared network namespace."
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        "dateReserved": "2026-05-13T15:03:33.108Z",
        "dateUpdated": "2026-10-19T19:36:56.452Z",
        "state": "PUBLISHED"
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  }
}



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