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ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-53221

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-53221

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "fbe68ee87522f6eaa10f9076c0a7117e1613f2f7",
        "lessThan": "c327fa4fca31415431202e063767a7ae342e19c6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fbe68ee87522f6eaa10f9076c0a7117e1613f2f7",
        "lessThan": "fc657ac0767c49839b3ef0b08dc0953ca30883f8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fbe68ee87522f6eaa10f9076c0a7117e1613f2f7",
        "lessThan": "47fb3c2b4203556308e64354b3e78f2ce221d646",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fbe68ee87522f6eaa10f9076c0a7117e1613f2f7",
        "lessThan": "f513f308cc4bdb4530d033431592ffbc29b7fca1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fbe68ee87522f6eaa10f9076c0a7117e1613f2f7",
        "lessThan": "90fd4513315ca07da99cfd8549d3e553a7160f0d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fbe68ee87522f6eaa10f9076c0a7117e1613f2f7",
        "lessThan": "2abfb19bbb81958714ad1d43ebeb65b30394184b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fbe68ee87522f6eaa10f9076c0a7117e1613f2f7",
        "lessThan": "2fc7bc087cc7085368263d9d37bfe9a0bddd6a2d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fbe68ee87522f6eaa10f9076c0a7117e1613f2f7",
        "lessThan": "a5c0359f5cbc51a2e2b114d6041e0f3c73f903e9",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/ipv6/ip6_vti.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.19"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.19",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.259",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.210",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.176",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.143",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.94",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.36",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.13",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/ipv6/ip6_vti.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-53221

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#40784 · Revision 1
Added to Heist Feed
Publisher date
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