CVE-2026-53249 (GCVE-0-2026-53249)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-25 08:39
VLAI
Title
ipv4: restrict IPOPT_SSRR and IPOPT_LSRR options
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4cd6e9ed49347d3a2fdaaf07e32fb524756dddc2 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2a87c3e8f03ce655ed0ef500d64d5fd924ec3691 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 89343ff12b3178fc236fe531a3603e7c97c68278 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 8ff85dbabbbfb05e86e6cde31d91ac5782179d4d (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 00e8845fe3428c69e980dce5071cb3da1d8f7578 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a4f3fd6516920988c47ba8d19714985c40c816a1 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 28f5ad1b4055405eb1616e603fe511ba5e3725e7 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d3915a1f5a4bc0ac911032903c3c6ab8df9fcc7c (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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          "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."
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      "providerMetadata": {
        "dateUpdated": "2026-06-25T08:39:41.971Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "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"
  },
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      "date": "2026-07-01",
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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.