CVE-2026-53221 (GCVE-0-2026-53221)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-28 06:40
VLAI
Title
ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()
Summary
In the Linux kernel, the following vulnerability has been resolved: ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup() In vti6_tnl_lookup(), when an exact match for a tunnel fails, the code falls back to searching for wildcard tunnels: - Tunnels matching the packet's local address, with any remote address wildcard remote). - Tunnels matching the packet's remote address, with any local address (wildcard local). However, vti6 stores all these different types of tunnels in the same hash table (ip6n->tnls_r_l) prone to hash collisions. The bug is that the fallback search loops in vti6_tnl_lookup() were missing checks to ensure that the candidate tunnel actually has a wildcard address.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 , < c327fa4fca31415431202e063767a7ae342e19c6 (git)
Affected: fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 , < fc657ac0767c49839b3ef0b08dc0953ca30883f8 (git)
Affected: fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 , < 47fb3c2b4203556308e64354b3e78f2ce221d646 (git)
Affected: fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 , < f513f308cc4bdb4530d033431592ffbc29b7fca1 (git)
Affected: fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 , < 90fd4513315ca07da99cfd8549d3e553a7160f0d (git)
Affected: fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 , < 2abfb19bbb81958714ad1d43ebeb65b30394184b (git)
Affected: fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 , < 2fc7bc087cc7085368263d9d37bfe9a0bddd6a2d (git)
Affected: fbe68ee87522f6eaa10f9076c0a7117e1613f2f7 , < a5c0359f5cbc51a2e2b114d6041e0f3c73f903e9 (git)
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Linux Linux Affected: 3.19
Unaffected: 0 , < 3.19 (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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      "providerMetadata": {
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    "cveId": "CVE-2026-53221",
    "datePublished": "2026-06-25T08:39:23.177Z",
    "dateReserved": "2026-06-09T07:44:35.392Z",
    "dateUpdated": "2026-06-28T06:40:33.070Z",
    "state": "PUBLISHED"
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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

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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.