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net: bridge: Reject descending VLAN tunnel ranges

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: net: bridge: Reject descending VLAN tunnel ranges A pair of descending VLAN and tunnel IDs can pass the tunnel range span check. The VLAN subtraction produces a negative int, which is converted to unsigned when compared with the u32 tunnel ID subtraction. It can therefore equal the wrapped tunnel ID delta. The range loop then performs no iterations. Since the batched notification handling added a post-loop error check, this leaves err uninitialized and makes the request's return value unpredictable. Reject descending VLAN ranges before comparing the spans. Valid ascending and single-entry ranges remain unchanged, while malformed descending ranges consistently return -EINVAL. This issue was found by a static analysis checker and confirmed by manual source review.

Announced Source revision 1
Original source ↗

CVE-2026-90114

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-2026-90114

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": "94339443686b36d3223bc032b7947267474e2679",
        "lessThan": "1181f6bad009408a259bab6aaf0681f11b487972",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "94339443686b36d3223bc032b7947267474e2679",
        "lessThan": "5a8e0e3a18b5e3172343b8479c5d04187f5b4795",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "94339443686b36d3223bc032b7947267474e2679",
        "lessThan": "0874a6d5275091429ec4c675c54c53a8776665ae",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "94339443686b36d3223bc032b7947267474e2679",
        "lessThan": "4b0f5b25f114651f03058395b490626c4444875e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "94339443686b36d3223bc032b7947267474e2679",
        "lessThan": "bd741b819ff1c239d26cc5b0f0e6b1fd4e67ed17",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "94339443686b36d3223bc032b7947267474e2679",
        "lessThan": "c0444d7499f113d6b7803ef0175591464e17525e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "94339443686b36d3223bc032b7947267474e2679",
        "lessThan": "434849b21ef56b09d16e6366b2a230002f363e45",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "94339443686b36d3223bc032b7947267474e2679",
        "lessThan": "b74a072d8fb71d3c9ffba4a17d5943e63266fb38",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/bridge/br_netlink_tunnel.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.9"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.9",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.52",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/bridge/br_netlink_tunnel.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-90114

Source reference: /cveMetadata/cveId

Publisher severity

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Event
#36517 · Revision 1
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