CVE-2026-98692 (GCVE-0-2026-98692)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:46 – Updated: 2026-10-19 09:24
VLAI
Title
thunderbolt: Make the DP tunnel activation callback mandatory
Summary
In the Linux kernel, the following vulnerability has been resolved: thunderbolt: Make the DP tunnel activation callback mandatory tb_tunnel_alloc_dp() takes an optional callback which is run from dprx_work once the DPRX capabilities read has completed. Without that callback tb_dp_dprx_start() reads the capabilities synchronously and never queues the work. It however always takes a tunnel reference which is only dropped by dprx_work itself or by tb_dp_dprx_stop() when cancel_delayed_work() actually canceled that work. That reference is thus leaked for every tunnel without a callback. The only tunnels without one are those from tb_tunnel_discover_dp(), which are activated again when restoring from hibernation. Pass the callback to tb_tunnel_discover_dp() as well and drop the synchronous path such that the DPRX capabilities are always read from dprx_work. Hibernation restore then also no longer blocks for up to 12 seconds while waiting for that read to complete. Also fix up the KUnit tests.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6971 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d6d458d42e1e1544a18f37f1d5c840e00d5261b9 , < 47d60ea801fc333a10c576691eca2e7840b02d3d (git)
Affected: d6d458d42e1e1544a18f37f1d5c840e00d5261b9 , < 12f5d8b85a66a0ac08d082517d92ce136f8c0d42 (git)
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Linux Linux Affected: 6.14
Unaffected: 0 , < 6.14 (semver)
Unaffected: 7.2.10 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/thunderbolt/tb.c",
            "drivers/thunderbolt/test.c",
            "drivers/thunderbolt/tunnel.c",
            "drivers/thunderbolt/tunnel.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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            },
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              "versionType": "original_commit_for_fix"
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              "operator": "OR"
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nthunderbolt: Make the DP tunnel activation callback mandatory\n\ntb_tunnel_alloc_dp() takes an optional callback which is run from\ndprx_work once the DPRX capabilities read has completed. Without that\ncallback tb_dp_dprx_start() reads the capabilities synchronously and\nnever queues the work. It however always takes a tunnel reference which\nis only dropped by dprx_work itself or by tb_dp_dprx_stop() when\ncancel_delayed_work() actually canceled that work. That reference is\nthus leaked for every tunnel without a callback.\n\nThe only tunnels without one are those from tb_tunnel_discover_dp(),\nwhich are activated again when restoring from hibernation.\nPass the callback to tb_tunnel_discover_dp() as well and drop the\nsynchronous path such that the DPRX capabilities are always read from\ndprx_work. Hibernation restore then also no longer blocks for up to 12\nseconds while waiting for that read to complete.\n\nAlso fix up the KUnit tests."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:24:02.145Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/12f5d8b85a66a0ac08d082517d92ce136f8c0d42"
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      "title": "thunderbolt: Make the DP tunnel activation callback mandatory",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98692",
    "datePublished": "2026-10-18T15:46:16.794Z",
    "dateReserved": "2026-09-25T10:25:14.364Z",
    "dateUpdated": "2026-10-19T09:24:02.145Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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      "percentile": "0.04659"
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      "id": "msrc_CVE-2026-98692",
      "initial_release_date": "2026-10-20T22:24:17.000Z",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
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      "title": "thunderbolt: Make the DP tunnel activation callback mandatory",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98692.json",
      "version": "2"
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    "nvd": {
      "cve": {
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            "affectedData": [
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                "product": "Linux",
                "programFiles": [
                  "drivers/thunderbolt/tb.c",
                  "drivers/thunderbolt/test.c",
                  "drivers/thunderbolt/tunnel.c",
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                ],
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                ],
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                "vendor": "Linux",
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nthunderbolt: Make the DP tunnel activation callback mandatory\n\ntb_tunnel_alloc_dp() takes an optional callback which is run from\ndprx_work once the DPRX capabilities read has completed. Without that\ncallback tb_dp_dprx_start() reads the capabilities synchronously and\nnever queues the work. It however always takes a tunnel reference which\nis only dropped by dprx_work itself or by tb_dp_dprx_stop() when\ncancel_delayed_work() actually canceled that work. That reference is\nthus leaked for every tunnel without a callback.\n\nThe only tunnels without one are those from tb_tunnel_discover_dp(),\nwhich are activated again when restoring from hibernation.\nPass the callback to tb_tunnel_discover_dp() as well and drop the\nsynchronous path such that the DPRX capabilities are always read from\ndprx_work. Hibernation restore then also no longer blocks for up to 12\nseconds while waiting for that read to complete.\n\nAlso fix up the KUnit tests."
          }
        ],
        "id": "CVE-2026-98692",
        "lastModified": "2026-10-19T10:19:33.553",
        "metrics": {},
        "published": "2026-10-18T16:17:22.623",
        "references": [
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
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      "cve": "CVE-2026-98692",
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      "source": "Red Hat CSAF VEX",
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      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-98692.json",
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    }
  }
}



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