FKIE_CVE-2026-90114

Vulnerability from fkie_nvd - Published: 2026-09-17 17:17 - Updated: 2026-09-17 17:17
Severity
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0874a6d5275091429ec4c675c54c53a8776665ae
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1181f6bad009408a259bab6aaf0681f11b487972
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/434849b21ef56b09d16e6366b2a230002f363e45
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4b0f5b25f114651f03058395b490626c4444875e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5a8e0e3a18b5e3172343b8479c5d04187f5b4795
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b74a072d8fb71d3c9ffba4a17d5943e63266fb38
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bd741b819ff1c239d26cc5b0f0e6b1fd4e67ed17
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c0444d7499f113d6b7803ef0175591464e17525e
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bridge/br_netlink_tunnel.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "1181f6bad009408a259bab6aaf0681f11b487972",
              "status": "affected",
              "version": "94339443686b36d3223bc032b7947267474e2679",
              "versionType": "git"
            },
            {
              "lessThan": "5a8e0e3a18b5e3172343b8479c5d04187f5b4795",
              "status": "affected",
              "version": "94339443686b36d3223bc032b7947267474e2679",
              "versionType": "git"
            },
            {
              "lessThan": "0874a6d5275091429ec4c675c54c53a8776665ae",
              "status": "affected",
              "version": "94339443686b36d3223bc032b7947267474e2679",
              "versionType": "git"
            },
            {
              "lessThan": "4b0f5b25f114651f03058395b490626c4444875e",
              "status": "affected",
              "version": "94339443686b36d3223bc032b7947267474e2679",
              "versionType": "git"
            },
            {
              "lessThan": "bd741b819ff1c239d26cc5b0f0e6b1fd4e67ed17",
              "status": "affected",
              "version": "94339443686b36d3223bc032b7947267474e2679",
              "versionType": "git"
            },
            {
              "lessThan": "c0444d7499f113d6b7803ef0175591464e17525e",
              "status": "affected",
              "version": "94339443686b36d3223bc032b7947267474e2679",
              "versionType": "git"
            },
            {
              "lessThan": "434849b21ef56b09d16e6366b2a230002f363e45",
              "status": "affected",
              "version": "94339443686b36d3223bc032b7947267474e2679",
              "versionType": "git"
            },
            {
              "lessThan": "b74a072d8fb71d3c9ffba4a17d5943e63266fb38",
              "status": "affected",
              "version": "94339443686b36d3223bc032b7947267474e2679",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/bridge/br_netlink_tunnel.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.9"
            },
            {
              "lessThan": "5.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bridge: Reject descending VLAN tunnel ranges\n\nA pair of descending VLAN and tunnel IDs can pass the tunnel range span\ncheck. The VLAN subtraction produces a negative int, which is converted\nto unsigned when compared with the u32 tunnel ID subtraction. It can\ntherefore equal the wrapped tunnel ID delta.\n\nThe range loop then performs no iterations. Since the batched\nnotification handling added a post-loop error check, this leaves err\nuninitialized and makes the request\u0027s return value unpredictable.\n\nReject descending VLAN ranges before comparing the spans. Valid\nascending and single-entry ranges remain unchanged, while malformed\ndescending ranges consistently return -EINVAL.\n\nThis issue was found by a static analysis checker and confirmed by\nmanual source review."
    }
  ],
  "id": "CVE-2026-90114",
  "lastModified": "2026-09-17T17:17:03.477",
  "metrics": {},
  "published": "2026-09-17T17:17:03.477",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0874a6d5275091429ec4c675c54c53a8776665ae"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1181f6bad009408a259bab6aaf0681f11b487972"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/434849b21ef56b09d16e6366b2a230002f363e45"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4b0f5b25f114651f03058395b490626c4444875e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5a8e0e3a18b5e3172343b8479c5d04187f5b4795"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b74a072d8fb71d3c9ffba4a17d5943e63266fb38"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/bd741b819ff1c239d26cc5b0f0e6b1fd4e67ed17"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c0444d7499f113d6b7803ef0175591464e17525e"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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