CVE-2026-98689 (GCVE-0-2026-98689)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:46 – Updated: 2026-10-19 09:23
VLAI
Title
thunderbolt: Don't access a DP tunnel after its DPRX read was canceled
Summary
In the Linux kernel, the following vulnerability has been resolved: thunderbolt: Don't access a DP tunnel after its DPRX read was canceled tb_dp_dprx_work() checks ->dprx_canceled before it takes tb->lock so it misses a tb_dp_dprx_stop() that could not cancel the already running work. It then polls the DPRX capabilities and runs the callback for a tunnel that has already been torn down while the domain is suspending or going away. This can be hit by cancelling the DPRX read from outside the ordered tb->wq: During suspend tb_disconnect_and_release_dp() does just this and with a later patch tb_stop() will do it as well. The latter in combination with the Apple NHI where the DPRX read never completed is how I hit this. Check the flag with tb->lock held instead and check it again in tb_dp_tunnel_active() because the callback runs after the lock has been dropped again. Also clear the flag in tb_dp_dprx_start() so that it only ever describes the work that is currently in flight.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6820 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d6d458d42e1e1544a18f37f1d5c840e00d5261b9 , < 405a969c0b3356639116db89ab367be1d64b77c0 (git)
Affected: d6d458d42e1e1544a18f37f1d5c840e00d5261b9 , < 2c2fd6a7fd5e1218db7e17336fc1a0393b6949e6 (git)
Affected: d6d458d42e1e1544a18f37f1d5c840e00d5261b9 , < 419fa32fa5bc2d7fb9d0d15d5630b1c1090808b3 (git)
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Linux Linux Affected: 6.14
Unaffected: 0 , < 6.14 (semver)
Unaffected: 6.18.56 , ≤ 6.18.* (semver)
Unaffected: 7.2.10 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/thunderbolt/tb.c",
            "drivers/thunderbolt/tunnel.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "lessThan": "405a969c0b3356639116db89ab367be1d64b77c0",
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            },
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              "versionType": "git"
            },
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "6.14"
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              "versionType": "semver"
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              "versionType": "semver"
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              "versionType": "original_commit_for_fix"
            }
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      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
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                  "versionStartIncluding": "6.14",
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                },
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nthunderbolt: Don\u0027t access a DP tunnel after its DPRX read was canceled\n\ntb_dp_dprx_work() checks -\u003edprx_canceled before it takes tb-\u003elock so it\nmisses a tb_dp_dprx_stop() that could not cancel the already running\nwork. It then polls the DPRX capabilities and runs the callback for a\ntunnel that has already been torn down while the domain is suspending or\ngoing away.\n\nThis can be hit by cancelling the DPRX read from outside the ordered\ntb-\u003ewq: During suspend tb_disconnect_and_release_dp() does just this and\nwith a later patch tb_stop() will do it as well. The latter in combination\nwith the Apple NHI where the DPRX read never completed is how I hit\nthis.\n\nCheck the flag with tb-\u003elock held instead and check it again in\ntb_dp_tunnel_active() because the callback runs after the lock has been\ndropped again.\n\nAlso clear the flag in tb_dp_dprx_start() so that it only ever describes\nthe work that is currently in flight."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:23:59.268Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/405a969c0b3356639116db89ab367be1d64b77c0"
        },
        {
          "url": "https://git.kernel.org/stable/c/2c2fd6a7fd5e1218db7e17336fc1a0393b6949e6"
        },
        {
          "url": "https://git.kernel.org/stable/c/419fa32fa5bc2d7fb9d0d15d5630b1c1090808b3"
        }
      ],
      "title": "thunderbolt: Don\u0027t access a DP tunnel after its DPRX read was canceled",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98689",
    "datePublished": "2026-10-18T15:46:04.217Z",
    "dateReserved": "2026-09-25T10:25:14.364Z",
    "dateUpdated": "2026-10-19T09:23:59.268Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
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      "date": "2026-11-02",
      "epss": "0.00166",
      "percentile": "0.05835"
    },
    "microsoft_vex": {
      "current_release_date": "2026-10-21T18:40:23.000Z",
      "cve": "CVE-2026-98689",
      "id": "msrc_CVE-2026-98689",
      "initial_release_date": "2026-10-20T22:24:11.000Z",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "thunderbolt: Don\u0027t access a DP tunnel after its DPRX read was canceled",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98689.json",
      "version": "2"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "drivers/thunderbolt/tb.c",
                  "drivers/thunderbolt/tunnel.c"
                ],
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              {
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                ],
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                "vendor": "Linux",
                "versions": [
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                  },
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                    "version": "7.2.10",
                    "versionType": "semver"
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              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nthunderbolt: Don\u0027t access a DP tunnel after its DPRX read was canceled\n\ntb_dp_dprx_work() checks -\u003edprx_canceled before it takes tb-\u003elock so it\nmisses a tb_dp_dprx_stop() that could not cancel the already running\nwork. It then polls the DPRX capabilities and runs the callback for a\ntunnel that has already been torn down while the domain is suspending or\ngoing away.\n\nThis can be hit by cancelling the DPRX read from outside the ordered\ntb-\u003ewq: During suspend tb_disconnect_and_release_dp() does just this and\nwith a later patch tb_stop() will do it as well. The latter in combination\nwith the Apple NHI where the DPRX read never completed is how I hit\nthis.\n\nCheck the flag with tb-\u003elock held instead and check it again in\ntb_dp_tunnel_active() because the callback runs after the lock has been\ndropped again.\n\nAlso clear the flag in tb_dp_dprx_start() so that it only ever describes\nthe work that is currently in flight."
          }
        ],
        "id": "CVE-2026-98689",
        "lastModified": "2026-10-19T10:19:33.283",
        "metrics": {},
        "published": "2026-10-18T16:17:22.317",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/2c2fd6a7fd5e1218db7e17336fc1a0393b6949e6"
          },
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/419fa32fa5bc2d7fb9d0d15d5630b1c1090808b3"
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-30T06:49:17+00:00",
      "cve": "CVE-2026-98689",
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      "initial_release_date": "2026-10-18T00:00:00+00:00",
      "product_status:known_affected": "186",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: thunderbolt: Don\u0027t access a DP tunnel after its DPRX read was canceled",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98689.json",
      "version": "3"
    }
  }
}



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