CVE-2026-53249 (GCVE-0-2026-53249)
Vulnerability from cvelistv5
Published
2026-06-25 08:39
Modified
2026-06-25 08:39
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ipv4: restrict IPOPT_SSRR and IPOPT_LSRR options This patch restricts setting Loose Source and Record Route (LSRR) and Strict Source and Record Route (SSRR) IP options to users with CAP_NET_RAW capability. This prevents unprivileged applications from forcing packets to route through attacker-controlled nodes to leak TCP ISN and possibly other protocol information. While LSRR and SSRR are commonly filtered in many network environments, they may still be supported and forwarded along some network paths. RFC 7126 (Recommendations on Filtering of IPv4 Packets Containing IPv4 Options) recommend to drop these options in 4.3 and 4.4.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/ip_options.c"
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              "version": "2.6.12"
            },
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              "version": "0",
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            },
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              "status": "unaffected",
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            },
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              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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          "nodes": [
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              "negate": false,
              "operator": "OR"
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: restrict IPOPT_SSRR and IPOPT_LSRR options\n\nThis patch restricts setting Loose Source and Record Route (LSRR)\nand Strict Source and Record Route (SSRR) IP options to users\nwith CAP_NET_RAW capability.\n\nThis prevents unprivileged applications from forcing packets to route\nthrough attacker-controlled nodes to leak TCP ISN and possibly other\nprotocol information.\n\nWhile LSRR and SSRR are commonly filtered in many network environments,\nthey may still be supported and forwarded along some network paths.\n\nRFC 7126 (Recommendations on Filtering of IPv4 Packets Containing\nIPv4 Options) recommend to drop these options in 4.3 and 4.4."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-25T08:39:41.971Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4cd6e9ed49347d3a2fdaaf07e32fb524756dddc2"
        },
        {
          "url": "https://git.kernel.org/stable/c/2a87c3e8f03ce655ed0ef500d64d5fd924ec3691"
        },
        {
          "url": "https://git.kernel.org/stable/c/89343ff12b3178fc236fe531a3603e7c97c68278"
        },
        {
          "url": "https://git.kernel.org/stable/c/8ff85dbabbbfb05e86e6cde31d91ac5782179d4d"
        },
        {
          "url": "https://git.kernel.org/stable/c/00e8845fe3428c69e980dce5071cb3da1d8f7578"
        },
        {
          "url": "https://git.kernel.org/stable/c/a4f3fd6516920988c47ba8d19714985c40c816a1"
        },
        {
          "url": "https://git.kernel.org/stable/c/28f5ad1b4055405eb1616e603fe511ba5e3725e7"
        },
        {
          "url": "https://git.kernel.org/stable/c/d3915a1f5a4bc0ac911032903c3c6ab8df9fcc7c"
        }
      ],
      "title": "ipv4: restrict IPOPT_SSRR and IPOPT_LSRR options",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53249",
    "datePublished": "2026-06-25T08:39:41.971Z",
    "dateReserved": "2026-06-09T07:44:35.394Z",
    "dateUpdated": "2026-06-25T08:39:41.971Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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