Vulnerability-Lookup

GHSA-VPMX-4VX6-75FP

Vulnerability from github – Published: 2026-10-18 18:32 – Updated: 2026-10-30 15:33

Details

In the Linux kernel, the following vulnerability has been resolved:

thunderbolt: Fix KASAN reported use-after-free when request is canceled

Alan reported that when doing stress testing sometimes KASAN notices use-after-free during control channel operation (stripped down keeping the relevant parts):

BUG: KASAN: slab-use-after-free in tb_cfg_request_sync+0x240/0x250 [thunderbolt] Read of size 24 at addr ffff88811067f290 by task kworker/u40:2/1760 tb_cfg_request_sync+0x240/0x250 [thunderbolt] tb_cfg_read_raw+0x367/0x510 [thunderbolt] tb_cfg_read+0xec/0x240 [thunderbolt] tb_port_get_link_generation+0x258/0x420 [thunderbolt] tb_usb3_consumed_bandwidth+0x1c1/0x2c0 [thunderbolt] tb_tunnel_consumed_bandwidth+0xfd/0x910 [thunderbolt] tb_available_bandwidth+0x5f2/0xeb0 [thunderbolt] tb_recalc_estimated_bandwidth+0x2a0/0x1bc0 [thunderbolt] tb_handle_dp_bandwidth_request+0x1897/0x5e20 [thunderbolt] process_one_work+0x675/0x1230 worker_thread+0x5e6/0xf70 kthread+0x365/0x470 ret_from_fork+0x54d/0x710 ret_from_fork_asm+0x1a/0x30

Allocated by task 1760: __kmalloc_cache_noprof+0x1ee/0x550 tb_cfg_read_raw+0x1d3/0x510 [thunderbolt] tb_cfg_read+0xec/0x240 [thunderbolt] tb_port_get_link_generation+0x258/0x420 [thunderbolt] tb_usb3_consumed_bandwidth+0x1c1/0x2c0 [thunderbolt] tb_tunnel_consumed_bandwidth+0xfd/0x910 [thunderbolt] tb_available_bandwidth+0x5f2/0xeb0 [thunderbolt] tb_recalc_estimated_bandwidth+0x2a0/0x1bc0 [thunderbolt] tb_handle_dp_bandwidth_request+0x1897/0x5e20 [thunderbolt] process_one_work+0x675/0x1230 worker_thread+0x5e6/0xf70 kthread+0x365/0x470 ret_from_fork+0x54d/0x710 ret_from_fork_asm+0x1a/0x30

Freed by task 926: kfree+0x18f/0x4a0 tb_cfg_request_put+0xb7/0xe0 [thunderbolt] tb_cfg_request_work+0x82/0x120 [thunderbolt] process_one_work+0x675/0x1230 worker_thread+0x5e6/0xf70 kthread+0x365/0x470 ret_from_fork+0x54d/0x710 ret_from_fork_asm+0x1a/0x30

Second to last potentially related work creation: __queue_work+0x575/0xd00 queue_work_on+0x77/0x80 tb_cfg_request_cancel+0xc7/0x260 [thunderbolt] tb_cfg_request_sync+0x1f6/0x250 [thunderbolt] tb_cfg_read_raw+0x367/0x510 [thunderbolt] tb_cfg_read+0xec/0x240 [thunderbolt] tb_port_get_link_generation+0x258/0x420 [thunderbolt] tb_usb3_consumed_bandwidth+0x1c1/0x2c0 [thunderbolt] tb_tunnel_consumed_bandwidth+0xfd/0x910 [thunderbolt] tb_available_bandwidth+0x5f2/0xeb0 [thunderbolt] tb_recalc_estimated_bandwidth+0x2a0/0x1bc0 [thunderbolt] tb_handle_dp_bandwidth_request+0x1897/0x5e20 [thunderbolt] process_one_work+0x675/0x1230 worker_thread+0x5e6/0xf70 kthread+0x365/0x470 ret_from_fork+0x54d/0x710 ret_from_fork_asm+0x1a/0x30

The last stack trace is helpful because it shows that we are cancelling a request and looking at tb_cfg_request_cancel() what might happen is that tb_cfg_request_work() completes right before tb_cfg_request_cancel() starts and because of this it will call schedule_work() queueing the same work to run again. However, it is already removed from the request_queue and reference count is dropped so when tb_cfg_request_work() triggers again it will access memory that is already released.

Fix this so that we first make sure a cancelled request is not handed away from tb_cfg_request_find() or scheduled to run. Then instead of relying on the worker to clean up the request we will do it in tb_cfg_request_cancel() after the work is canceled from running. Make tb_cfg_request_dequeue() release the request only if it was actually removed from the queue.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98694"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-18T16:17:22Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nthunderbolt: Fix KASAN reported use-after-free when request is canceled\n\nAlan reported that when doing stress testing sometimes KASAN notices\nuse-after-free during control channel operation (stripped down keeping\nthe relevant parts):\n\n BUG: KASAN: slab-use-after-free in tb_cfg_request_sync+0x240/0x250 [thunderbolt]\n Read of size 24 at addr ffff88811067f290 by task kworker/u40:2/1760\n  \u003cTASK\u003e\n  tb_cfg_request_sync+0x240/0x250 [thunderbolt]\n  tb_cfg_read_raw+0x367/0x510 [thunderbolt]\n  tb_cfg_read+0xec/0x240 [thunderbolt]\n  tb_port_get_link_generation+0x258/0x420 [thunderbolt]\n  tb_usb3_consumed_bandwidth+0x1c1/0x2c0 [thunderbolt]\n  tb_tunnel_consumed_bandwidth+0xfd/0x910 [thunderbolt]\n  tb_available_bandwidth+0x5f2/0xeb0 [thunderbolt]\n  tb_recalc_estimated_bandwidth+0x2a0/0x1bc0 [thunderbolt]\n  tb_handle_dp_bandwidth_request+0x1897/0x5e20 [thunderbolt]\n  process_one_work+0x675/0x1230\n  worker_thread+0x5e6/0xf70\n  kthread+0x365/0x470\n  ret_from_fork+0x54d/0x710\n  ret_from_fork_asm+0x1a/0x30\n  \u003c/TASK\u003e\n\n Allocated by task 1760:\n  __kmalloc_cache_noprof+0x1ee/0x550\n  tb_cfg_read_raw+0x1d3/0x510 [thunderbolt]\n  tb_cfg_read+0xec/0x240 [thunderbolt]\n  tb_port_get_link_generation+0x258/0x420 [thunderbolt]\n  tb_usb3_consumed_bandwidth+0x1c1/0x2c0 [thunderbolt]\n  tb_tunnel_consumed_bandwidth+0xfd/0x910 [thunderbolt]\n  tb_available_bandwidth+0x5f2/0xeb0 [thunderbolt]\n  tb_recalc_estimated_bandwidth+0x2a0/0x1bc0 [thunderbolt]\n  tb_handle_dp_bandwidth_request+0x1897/0x5e20 [thunderbolt]\n  process_one_work+0x675/0x1230\n  worker_thread+0x5e6/0xf70\n  kthread+0x365/0x470\n  ret_from_fork+0x54d/0x710\n  ret_from_fork_asm+0x1a/0x30\n\n Freed by task 926:\n  kfree+0x18f/0x4a0\n  tb_cfg_request_put+0xb7/0xe0 [thunderbolt]\n  tb_cfg_request_work+0x82/0x120 [thunderbolt]\n  process_one_work+0x675/0x1230\n  worker_thread+0x5e6/0xf70\n  kthread+0x365/0x470\n  ret_from_fork+0x54d/0x710\n  ret_from_fork_asm+0x1a/0x30\n\n Second to last potentially related work creation:\n  __queue_work+0x575/0xd00\n  queue_work_on+0x77/0x80\n  tb_cfg_request_cancel+0xc7/0x260 [thunderbolt]\n  tb_cfg_request_sync+0x1f6/0x250 [thunderbolt]\n  tb_cfg_read_raw+0x367/0x510 [thunderbolt]\n  tb_cfg_read+0xec/0x240 [thunderbolt]\n  tb_port_get_link_generation+0x258/0x420 [thunderbolt]\n  tb_usb3_consumed_bandwidth+0x1c1/0x2c0 [thunderbolt]\n  tb_tunnel_consumed_bandwidth+0xfd/0x910 [thunderbolt]\n  tb_available_bandwidth+0x5f2/0xeb0 [thunderbolt]\n  tb_recalc_estimated_bandwidth+0x2a0/0x1bc0 [thunderbolt]\n  tb_handle_dp_bandwidth_request+0x1897/0x5e20 [thunderbolt]\n  process_one_work+0x675/0x1230\n  worker_thread+0x5e6/0xf70\n  kthread+0x365/0x470\n  ret_from_fork+0x54d/0x710\n  ret_from_fork_asm+0x1a/0x30\n\nThe last stack trace is helpful because it shows that we are cancelling\na request and looking at tb_cfg_request_cancel() what might happen is\nthat tb_cfg_request_work() completes right before tb_cfg_request_cancel()\nstarts and because of this it will call schedule_work() queueing the\nsame work to run again. However, it is already removed from the\nrequest_queue and reference count is dropped so when\ntb_cfg_request_work() triggers again it will access memory that is\nalready released.\n\nFix this so that we first make sure a cancelled request is not handed\naway from tb_cfg_request_find() or scheduled to run. Then instead of\nrelying on the worker to clean up the request we will do it in\ntb_cfg_request_cancel() after the work is canceled from running. Make\ntb_cfg_request_dequeue() release the request only if it was actually\nremoved from the queue.",
  "id": "GHSA-vpmx-4vx6-75fp",
  "modified": "2026-10-30T15:33:55Z",
  "published": "2026-10-18T18:32:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98694"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/08287212b622039212c972806f896f078dfd28e2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0dc4296ac0910d3a43d9e105226ace463e475304"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/71b3c517e02af2c46ad58d4b3706b7c3cb24936d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/94358146389d985b809898cc23b1030ff240a25d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9594550e95bcc362027b7ad5f0d5665110f8a7d8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a02188ddc24b7872f0c5e0c5873f827318717803"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b70b9c41f240c42bf6e728034537c0fe60c16ef4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f18faa3d3b810d60a3005ae1b1d1866faa67d343"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-98694 (GCVE-0-2026-98694)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:46 – Updated: 2026-10-30 12:38

Title

thunderbolt: Fix KASAN reported use-after-free when request is canceled

Summary

In the Linux kernel, the following vulnerability has been resolved: thunderbolt: Fix KASAN reported use-after-free when request is canceled Alan reported that when doing stress testing sometimes KASAN notices use-after-free during control channel operation (stripped down keeping the relevant parts): BUG: KASAN: slab-use-after-free in tb_cfg_request_sync+0x240/0x250 [thunderbolt] Read of size 24 at addr ffff88811067f290 by task kworker/u40:2/1760 <TASK> tb_cfg_request_sync+0x240/0x250 [thunderbolt] tb_cfg_read_raw+0x367/0x510 [thunderbolt] tb_cfg_read+0xec/0x240 [thunderbolt] tb_port_get_link_generation+0x258/0x420 [thunderbolt] tb_usb3_consumed_bandwidth+0x1c1/0x2c0 [thunderbolt] tb_tunnel_consumed_bandwidth+0xfd/0x910 [thunderbolt] tb_available_bandwidth+0x5f2/0xeb0 [thunderbolt] tb_recalc_estimated_bandwidth+0x2a0/0x1bc0 [thunderbolt] tb_handle_dp_bandwidth_request+0x1897/0x5e20 [thunderbolt] process_one_work+0x675/0x1230 worker_thread+0x5e6/0xf70 kthread+0x365/0x470 ret_from_fork+0x54d/0x710 ret_from_fork_asm+0x1a/0x30 </TASK> Allocated by task 1760: __kmalloc_cache_noprof+0x1ee/0x550 tb_cfg_read_raw+0x1d3/0x510 [thunderbolt] tb_cfg_read+0xec/0x240 [thunderbolt] tb_port_get_link_generation+0x258/0x420 [thunderbolt] tb_usb3_consumed_bandwidth+0x1c1/0x2c0 [thunderbolt] tb_tunnel_consumed_bandwidth+0xfd/0x910 [thunderbolt] tb_available_bandwidth+0x5f2/0xeb0 [thunderbolt] tb_recalc_estimated_bandwidth+0x2a0/0x1bc0 [thunderbolt] tb_handle_dp_bandwidth_request+0x1897/0x5e20 [thunderbolt] process_one_work+0x675/0x1230 worker_thread+0x5e6/0xf70 kthread+0x365/0x470 ret_from_fork+0x54d/0x710 ret_from_fork_asm+0x1a/0x30 Freed by task 926: kfree+0x18f/0x4a0 tb_cfg_request_put+0xb7/0xe0 [thunderbolt] tb_cfg_request_work+0x82/0x120 [thunderbolt] process_one_work+0x675/0x1230 worker_thread+0x5e6/0xf70 kthread+0x365/0x470 ret_from_fork+0x54d/0x710 ret_from_fork_asm+0x1a/0x30 Second to last potentially related work creation: __queue_work+0x575/0xd00 queue_work_on+0x77/0x80 tb_cfg_request_cancel+0xc7/0x260 [thunderbolt] tb_cfg_request_sync+0x1f6/0x250 [thunderbolt] tb_cfg_read_raw+0x367/0x510 [thunderbolt] tb_cfg_read+0xec/0x240 [thunderbolt] tb_port_get_link_generation+0x258/0x420 [thunderbolt] tb_usb3_consumed_bandwidth+0x1c1/0x2c0 [thunderbolt] tb_tunnel_consumed_bandwidth+0xfd/0x910 [thunderbolt] tb_available_bandwidth+0x5f2/0xeb0 [thunderbolt] tb_recalc_estimated_bandwidth+0x2a0/0x1bc0 [thunderbolt] tb_handle_dp_bandwidth_request+0x1897/0x5e20 [thunderbolt] process_one_work+0x675/0x1230 worker_thread+0x5e6/0xf70 kthread+0x365/0x470 ret_from_fork+0x54d/0x710 ret_from_fork_asm+0x1a/0x30 The last stack trace is helpful because it shows that we are cancelling a request and looking at tb_cfg_request_cancel() what might happen is that tb_cfg_request_work() completes right before tb_cfg_request_cancel() starts and because of this it will call schedule_work() queueing the same work to run again. However, it is already removed from the request_queue and reference count is dropped so when tb_cfg_request_work() triggers again it will access memory that is already released. Fix this so that we first make sure a cancelled request is not handed away from tb_cfg_request_find() or scheduled to run. Then instead of relying on the worker to clean up the request we will do it in tb_cfg_request_cancel() after the work is canceled from running. Make tb_cfg_request_dequeue() release the request only if it was actually removed from the queue.

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6848 records in the last 180 days details

References

8 references

URL	Tags
https://git.kernel.org/stable/c/94358146389d985b8…
https://git.kernel.org/stable/c/9594550e95bcc3620…
https://git.kernel.org/stable/c/0dc4296ac0910d3a4…
https://git.kernel.org/stable/c/b70b9c41f240c42bf…
https://git.kernel.org/stable/c/71b3c517e02af2c46…
https://git.kernel.org/stable/c/f18faa3d3b810d60a…
https://git.kernel.org/stable/c/08287212b62203921…
https://git.kernel.org/stable/c/a02188ddc24b7872f…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: d7f781bfdbf4eb7c5706c9974b8bf6d3c82e69c1 , < 94358146389d985b809898cc23b1030ff240a25d (git) Affected: d7f781bfdbf4eb7c5706c9974b8bf6d3c82e69c1 , < 9594550e95bcc362027b7ad5f0d5665110f8a7d8 (git) Affected: d7f781bfdbf4eb7c5706c9974b8bf6d3c82e69c1 , < 0dc4296ac0910d3a43d9e105226ace463e475304 (git) Affected: d7f781bfdbf4eb7c5706c9974b8bf6d3c82e69c1 , < b70b9c41f240c42bf6e728034537c0fe60c16ef4 (git) Affected: d7f781bfdbf4eb7c5706c9974b8bf6d3c82e69c1 , < 71b3c517e02af2c46ad58d4b3706b7c3cb24936d (git) Affected: d7f781bfdbf4eb7c5706c9974b8bf6d3c82e69c1 , < f18faa3d3b810d60a3005ae1b1d1866faa67d343 (git) Affected: d7f781bfdbf4eb7c5706c9974b8bf6d3c82e69c1 , < 08287212b622039212c972806f896f078dfd28e2 (git) Affected: d7f781bfdbf4eb7c5706c9974b8bf6d3c82e69c1 , < a02188ddc24b7872f0c5e0c5873f827318717803 (git)
Linux	Linux	Affected: 4.13 Unaffected: 0 , < 4.13 (semver) Unaffected: 5.10.273 , ≤ 5.10.* (semver) Unaffected: 5.15.224 , ≤ 5.15.* (semver) Unaffected: 6.1.191 , ≤ 6.1.* (semver) Unaffected: 6.6.160 , ≤ 6.6.* (semver) Unaffected: 6.12.113 , ≤ 6.12.* (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/ctl.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "94358146389d985b809898cc23b1030ff240a25d",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "9594550e95bcc362027b7ad5f0d5665110f8a7d8",
              "status": "affected",
              "version": "d7f781bfdbf4eb7c5706c9974b8bf6d3c82e69c1",
              "versionType": "git"
            },
            {
              "lessThan": "0dc4296ac0910d3a43d9e105226ace463e475304",
              "status": "affected",
              "version": "d7f781bfdbf4eb7c5706c9974b8bf6d3c82e69c1",
              "versionType": "git"
            },
            {
              "lessThan": "b70b9c41f240c42bf6e728034537c0fe60c16ef4",
              "status": "affected",
              "version": "d7f781bfdbf4eb7c5706c9974b8bf6d3c82e69c1",
              "versionType": "git"
            },
            {
              "lessThan": "71b3c517e02af2c46ad58d4b3706b7c3cb24936d",
              "status": "affected",
              "version": "d7f781bfdbf4eb7c5706c9974b8bf6d3c82e69c1",
              "versionType": "git"
            },
            {
              "lessThan": "f18faa3d3b810d60a3005ae1b1d1866faa67d343",
              "status": "affected",
              "version": "d7f781bfdbf4eb7c5706c9974b8bf6d3c82e69c1",
              "versionType": "git"
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              "status": "affected",
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
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          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.13"
            },
            {
              "lessThan": "4.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.273",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.224",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.191",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.113",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.56",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.273",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.224",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.191",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.160",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.113",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.56",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.10",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nthunderbolt: Fix KASAN reported use-after-free when request is canceled\n\nAlan reported that when doing stress testing sometimes KASAN notices\nuse-after-free during control channel operation (stripped down keeping\nthe relevant parts):\n\n BUG: KASAN: slab-use-after-free in tb_cfg_request_sync+0x240/0x250 [thunderbolt]\n Read of size 24 at addr ffff88811067f290 by task kworker/u40:2/1760\n  \u003cTASK\u003e\n  tb_cfg_request_sync+0x240/0x250 [thunderbolt]\n  tb_cfg_read_raw+0x367/0x510 [thunderbolt]\n  tb_cfg_read+0xec/0x240 [thunderbolt]\n  tb_port_get_link_generation+0x258/0x420 [thunderbolt]\n  tb_usb3_consumed_bandwidth+0x1c1/0x2c0 [thunderbolt]\n  tb_tunnel_consumed_bandwidth+0xfd/0x910 [thunderbolt]\n  tb_available_bandwidth+0x5f2/0xeb0 [thunderbolt]\n  tb_recalc_estimated_bandwidth+0x2a0/0x1bc0 [thunderbolt]\n  tb_handle_dp_bandwidth_request+0x1897/0x5e20 [thunderbolt]\n  process_one_work+0x675/0x1230\n  worker_thread+0x5e6/0xf70\n  kthread+0x365/0x470\n  ret_from_fork+0x54d/0x710\n  ret_from_fork_asm+0x1a/0x30\n  \u003c/TASK\u003e\n\n Allocated by task 1760:\n  __kmalloc_cache_noprof+0x1ee/0x550\n  tb_cfg_read_raw+0x1d3/0x510 [thunderbolt]\n  tb_cfg_read+0xec/0x240 [thunderbolt]\n  tb_port_get_link_generation+0x258/0x420 [thunderbolt]\n  tb_usb3_consumed_bandwidth+0x1c1/0x2c0 [thunderbolt]\n  tb_tunnel_consumed_bandwidth+0xfd/0x910 [thunderbolt]\n  tb_available_bandwidth+0x5f2/0xeb0 [thunderbolt]\n  tb_recalc_estimated_bandwidth+0x2a0/0x1bc0 [thunderbolt]\n  tb_handle_dp_bandwidth_request+0x1897/0x5e20 [thunderbolt]\n  process_one_work+0x675/0x1230\n  worker_thread+0x5e6/0xf70\n  kthread+0x365/0x470\n  ret_from_fork+0x54d/0x710\n  ret_from_fork_asm+0x1a/0x30\n\n Freed by task 926:\n  kfree+0x18f/0x4a0\n  tb_cfg_request_put+0xb7/0xe0 [thunderbolt]\n  tb_cfg_request_work+0x82/0x120 [thunderbolt]\n  process_one_work+0x675/0x1230\n  worker_thread+0x5e6/0xf70\n  kthread+0x365/0x470\n  ret_from_fork+0x54d/0x710\n  ret_from_fork_asm+0x1a/0x30\n\n Second to last potentially related work creation:\n  __queue_work+0x575/0xd00\n  queue_work_on+0x77/0x80\n  tb_cfg_request_cancel+0xc7/0x260 [thunderbolt]\n  tb_cfg_request_sync+0x1f6/0x250 [thunderbolt]\n  tb_cfg_read_raw+0x367/0x510 [thunderbolt]\n  tb_cfg_read+0xec/0x240 [thunderbolt]\n  tb_port_get_link_generation+0x258/0x420 [thunderbolt]\n  tb_usb3_consumed_bandwidth+0x1c1/0x2c0 [thunderbolt]\n  tb_tunnel_consumed_bandwidth+0xfd/0x910 [thunderbolt]\n  tb_available_bandwidth+0x5f2/0xeb0 [thunderbolt]\n  tb_recalc_estimated_bandwidth+0x2a0/0x1bc0 [thunderbolt]\n  tb_handle_dp_bandwidth_request+0x1897/0x5e20 [thunderbolt]\n  process_one_work+0x675/0x1230\n  worker_thread+0x5e6/0xf70\n  kthread+0x365/0x470\n  ret_from_fork+0x54d/0x710\n  ret_from_fork_asm+0x1a/0x30\n\nThe last stack trace is helpful because it shows that we are cancelling\na request and looking at tb_cfg_request_cancel() what might happen is\nthat tb_cfg_request_work() completes right before tb_cfg_request_cancel()\nstarts and because of this it will call schedule_work() queueing the\nsame work to run again. However, it is already removed from the\nrequest_queue and reference count is dropped so when\ntb_cfg_request_work() triggers again it will access memory that is\nalready released.\n\nFix this so that we first make sure a cancelled request is not handed\naway from tb_cfg_request_find() or scheduled to run. Then instead of\nrelying on the worker to clean up the request we will do it in\ntb_cfg_request_cancel() after the work is canceled from running. Make\ntb_cfg_request_dequeue() release the request only if it was actually\nremoved from the queue."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:38:46.335Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/94358146389d985b809898cc23b1030ff240a25d"
        },
        {
          "url": "https://git.kernel.org/stable/c/9594550e95bcc362027b7ad5f0d5665110f8a7d8"
        },
        {
          "url": "https://git.kernel.org/stable/c/0dc4296ac0910d3a43d9e105226ace463e475304"
        },
        {
          "url": "https://git.kernel.org/stable/c/b70b9c41f240c42bf6e728034537c0fe60c16ef4"
        },
        {
          "url": "https://git.kernel.org/stable/c/71b3c517e02af2c46ad58d4b3706b7c3cb24936d"
        },
        {
          "url": "https://git.kernel.org/stable/c/f18faa3d3b810d60a3005ae1b1d1866faa67d343"
        },
        {
          "url": "https://git.kernel.org/stable/c/08287212b622039212c972806f896f078dfd28e2"
        },
        {
          "url": "https://git.kernel.org/stable/c/a02188ddc24b7872f0c5e0c5873f827318717803"
        }
      ],
      "title": "thunderbolt: Fix KASAN reported use-after-free when request is canceled",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98694",
    "datePublished": "2026-10-18T15:46:18.654Z",
    "dateReserved": "2026-09-25T10:25:14.364Z",
    "dateUpdated": "2026-10-30T12:38:46.335Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

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