FKIE_CVE-2026-80989

Vulnerability from fkie_nvd - Published: 2026-09-11 20:19 - Updated: 2026-10-30 13:20
Severity
8.8 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net: thunderbolt: Mark the connection down when bringing it up fails Every failure path in tbnet_connected_work() undoes its own work and returns without clearing login_sent, so the connection still looks established. The next tbnet_tear_down() therefore takes its main branch and repeats a teardown that already happened: it stops rings that are already stopped, which is a dev_WARN() and fatal under panic_on_warn, and it releases net->remote_transmit_path even on the HopID mismatch path, where this connection never owned that id, silently freeing one that someone else is still using. Clear login_sent on those paths. That is enough for tbnet_tear_down() to leave the unwound state alone, and login_received has to stay set: it records that the peer has logged in and carries the transmit path it gave us, which nothing on this side can make the peer send again. Two things change beyond keeping the teardown out of the way: the logout request in that block is no longer sent, and the peer's next login request now re-queues our login work rather than connected_work, giving the connection a fresh login instead of a retry on stale state.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3c8b26ebf525ba5960510f48c6e9936a79ebe76f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c18f4ce9e2cb8836c302ef30a1e3392a0233c7b3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d6c0af293129345a17dc31c9b4179dc7f3d6af7a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e0d4a17afde5aa0045dc3e1d66c6bb80927bad8c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ed1d6e3d735e7b03f43a02f4306c89eb7663da14
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f01e6a35c440b62f060e21f36b385e574a7f308c
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/thunderbolt/main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c18f4ce9e2cb8836c302ef30a1e3392a0233c7b3",
              "status": "affected",
              "version": "e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e",
              "versionType": "git"
            },
            {
              "lessThan": "e0d4a17afde5aa0045dc3e1d66c6bb80927bad8c",
              "status": "affected",
              "version": "e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e",
              "versionType": "git"
            },
            {
              "lessThan": "ed1d6e3d735e7b03f43a02f4306c89eb7663da14",
              "status": "affected",
              "version": "e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e",
              "versionType": "git"
            },
            {
              "lessThan": "f01e6a35c440b62f060e21f36b385e574a7f308c",
              "status": "affected",
              "version": "e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e",
              "versionType": "git"
            },
            {
              "lessThan": "d6c0af293129345a17dc31c9b4179dc7f3d6af7a",
              "status": "affected",
              "version": "e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e",
              "versionType": "git"
            },
            {
              "lessThan": "3c8b26ebf525ba5960510f48c6e9936a79ebe76f",
              "status": "affected",
              "version": "e69b6c02b4c3b8d03be7136f90dd9551ad5a5a5e",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/thunderbolt/main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.15"
            },
            {
              "lessThan": "4.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.191",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "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: thunderbolt: Mark the connection down when bringing it up fails\n\nEvery failure path in tbnet_connected_work() undoes its own work and\nreturns without clearing login_sent, so the connection still looks\nestablished. The next tbnet_tear_down() therefore takes its main branch\nand repeats a teardown that already happened: it stops rings that are\nalready stopped, which is a dev_WARN() and fatal under panic_on_warn,\nand it releases net-\u003eremote_transmit_path even on the HopID mismatch\npath, where this connection never owned that id, silently freeing one\nthat someone else is still using.\n\nClear login_sent on those paths. That is enough for tbnet_tear_down() to\nleave the unwound state alone, and login_received has to stay set: it\nrecords that the peer has logged in and carries the transmit path it gave\nus, which nothing on this side can make the peer send again. Two things\nchange beyond keeping the teardown out of the way: the logout request in\nthat block is no longer sent, and the peer\u0027s next login request now\nre-queues our login work rather than connected_work, giving the\nconnection a fresh login instead of a retry on stale state."
    }
  ],
  "id": "CVE-2026-80989",
  "lastModified": "2026-10-30T13:20:15.017",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-80989",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-10-16T19:21:56.534569Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-09-11T20:19:05.730",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3c8b26ebf525ba5960510f48c6e9936a79ebe76f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c18f4ce9e2cb8836c302ef30a1e3392a0233c7b3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d6c0af293129345a17dc31c9b4179dc7f3d6af7a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e0d4a17afde5aa0045dc3e1d66c6bb80927bad8c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ed1d6e3d735e7b03f43a02f4306c89eb7663da14"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f01e6a35c440b62f060e21f36b385e574a7f308c"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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