Vulnerability-Lookup

CVE-2026-64594 (GCVE-0-2026-64594)

Vulnerability from cvelistv5 – Published: 2026-08-06 07:13 – Updated: 2026-08-06 07:13

Title

usb: gadget: f_fs: initialize reset_work at allocation time

Summary

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_fs: initialize reset_work at allocation time ffs_fs_kill_sb() unconditionally calls cancel_work_sync() on ffs->reset_work when a functionfs instance is unmounted: ffs_data_reset(ffs); cancel_work_sync(&ffs->reset_work); However ffs->reset_work is only ever initialized via INIT_WORK() in ffs_func_set_alt() and ffs_func_disable(), and only on the FFS_DEACTIVATED path. That state is reached solely by ffs_data_closed() when the instance is mounted with the "no_disconnect" option, so for the common case (no "no_disconnect", or mounted and unmounted without ever being deactivated) reset_work is never initialized. ffs_data_new() allocates the ffs_data with kzalloc_obj() and does not initialize reset_work, and ffs_data_reset()/ffs_data_clear() do not touch it either, so reset_work.func is left NULL. cancel_work_sync() on such a work then trips the WARN_ON(!work->func) guard in __flush_work(): WARNING: kernel/workqueue.c:4301 at __flush_work+0x330/0x360, CPU#3: umount Call trace: __flush_work cancel_work_sync ffs_fs_kill_sb [usb_f_fs] deactivate_locked_super deactivate_super cleanup_mnt __cleanup_mnt task_work_run exit_to_user_mode_loop el0_svc On older kernels cancel_work_sync() on a zero-initialized work struct was a silent no-op, which hid the missing initialization. Initialize reset_work once in ffs_data_new() so it is always valid for the lifetime of the ffs_data, and drop the now-redundant INIT_WORK() calls from the two deactivation paths.

Severity

No CVSS data available.

Assigner

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/7fe895e0a9651518c…
https://git.kernel.org/stable/c/0de6ebbabfbbc9c28…
https://git.kernel.org/stable/c/cb19e54ebe9baf3c3…
https://git.kernel.org/stable/c/d5631081be07f20e7…
https://git.kernel.org/stable/c/c36393b0d14e1e978…
https://git.kernel.org/stable/c/69faa3779250df14f…
https://git.kernel.org/stable/c/ba1867999dbc4085e…
https://git.kernel.org/stable/c/3137b243c93982fe3…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 18d6b32fca3841f7cd9479b4024abd8a9b299281 , < 7fe895e0a9651518c4fc082487da770ff9c14c7f (git) Affected: 18d6b32fca3841f7cd9479b4024abd8a9b299281 , < 0de6ebbabfbbc9c28350283dc97d8a519d5c6dd7 (git) Affected: 18d6b32fca3841f7cd9479b4024abd8a9b299281 , < cb19e54ebe9baf3c3243083ade65c937339ccb7b (git) Affected: 18d6b32fca3841f7cd9479b4024abd8a9b299281 , < d5631081be07f20e764d3cb5c98ac0a1004fba51 (git) Affected: 18d6b32fca3841f7cd9479b4024abd8a9b299281 , < c36393b0d14e1e9783888f821ffe29381b8f46dc (git) Affected: 18d6b32fca3841f7cd9479b4024abd8a9b299281 , < 69faa3779250df14f51d5084f938a99809546e52 (git) Affected: 18d6b32fca3841f7cd9479b4024abd8a9b299281 , < ba1867999dbc4085e6d8c52ac5266005b8b2bf07 (git) Affected: 18d6b32fca3841f7cd9479b4024abd8a9b299281 , < 3137b243c93982fe3460335e12f9247739766e10 (git)
Linux	Linux	Affected: 4.0 Unaffected: 0 , < 4.0 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc3 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_fs: initialize reset_work at allocation time\n\nffs_fs_kill_sb() unconditionally calls cancel_work_sync() on\nffs-\u003ereset_work when a functionfs instance is unmounted:\n\n\tffs_data_reset(ffs);\n\tcancel_work_sync(\u0026ffs-\u003ereset_work);\n\nHowever ffs-\u003ereset_work is only ever initialized via INIT_WORK() in\nffs_func_set_alt() and ffs_func_disable(), and only on the\nFFS_DEACTIVATED path. That state is reached solely by ffs_data_closed()\nwhen the instance is mounted with the \"no_disconnect\" option, so for the\ncommon case (no \"no_disconnect\", or mounted and unmounted without ever\nbeing deactivated) reset_work is never initialized.\n\nffs_data_new() allocates the ffs_data with kzalloc_obj() and does not\ninitialize reset_work, and ffs_data_reset()/ffs_data_clear() do not touch\nit either, so reset_work.func is left NULL. cancel_work_sync() on such a\nwork then trips the WARN_ON(!work-\u003efunc) guard in __flush_work():\n\n  WARNING: kernel/workqueue.c:4301 at __flush_work+0x330/0x360, CPU#3: umount\n  Call trace:\n   __flush_work\n   cancel_work_sync\n   ffs_fs_kill_sb [usb_f_fs]\n   deactivate_locked_super\n   deactivate_super\n   cleanup_mnt\n   __cleanup_mnt\n   task_work_run\n   exit_to_user_mode_loop\n   el0_svc\n\nOn older kernels cancel_work_sync() on a zero-initialized work struct was\na silent no-op, which hid the missing initialization.\n\nInitialize reset_work once in ffs_data_new() so it is always valid for\nthe lifetime of the ffs_data, and drop the now-redundant INIT_WORK()\ncalls from the two deactivation paths."
        }
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That state is reached solely by ffs_data_closed()\\nwhen the instance is mounted with the \\\"no_disconnect\\\" option, so for the\\ncommon case (no \\\"no_disconnect\\\", or mounted and unmounted without ever\\nbeing deactivated) reset_work is never initialized.\\n\\nffs_data_new() allocates the ffs_data with kzalloc_obj() and does not\\ninitialize reset_work, and ffs_data_reset()/ffs_data_clear() do not touch\\nit either, so reset_work.func is left NULL. cancel_work_sync() on such a\\nwork then trips the WARN_ON(!work-\u003efunc) guard in __flush_work():\\n\\n  WARNING: kernel/workqueue.c:4301 at __flush_work+0x330/0x360, CPU#3: umount\\n  Call trace:\\n   __flush_work\\n   cancel_work_sync\\n   ffs_fs_kill_sb [usb_f_fs]\\n   deactivate_locked_super\\n   deactivate_super\\n   cleanup_mnt\\n   __cleanup_mnt\\n   task_work_run\\n   exit_to_user_mode_loop\\n   el0_svc\\n\\nOn older kernels cancel_work_sync() on a zero-initialized work struct was\\na silent no-op, which hid the missing initialization.\\n\\nInitialize reset_work once in ffs_data_new() so it is always valid for\\nthe lifetime of the ffs_data, and drop the now-redundant INIT_WORK()\\ncalls from the two deactivation 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}

GHSA-28FC-4VWX-PR32

Vulnerability from github – Published: 2026-08-06 09:30 – Updated: 2026-08-06 09:30

Details

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

usb: gadget: f_fs: initialize reset_work at allocation time

ffs_fs_kill_sb() unconditionally calls cancel_work_sync() on ffs->reset_work when a functionfs instance is unmounted:

ffs_data_reset(ffs);
cancel_work_sync(&ffs->reset_work);

However ffs->reset_work is only ever initialized via INIT_WORK() in ffs_func_set_alt() and ffs_func_disable(), and only on the FFS_DEACTIVATED path. That state is reached solely by ffs_data_closed() when the instance is mounted with the "no_disconnect" option, so for the common case (no "no_disconnect", or mounted and unmounted without ever being deactivated) reset_work is never initialized.

ffs_data_new() allocates the ffs_data with kzalloc_obj() and does not initialize reset_work, and ffs_data_reset()/ffs_data_clear() do not touch it either, so reset_work.func is left NULL. cancel_work_sync() on such a work then trips the WARN_ON(!work->func) guard in __flush_work():

WARNING: kernel/workqueue.c:4301 at __flush_work+0x330/0x360, CPU#3: umount Call trace: __flush_work cancel_work_sync ffs_fs_kill_sb [usb_f_fs] deactivate_locked_super deactivate_super cleanup_mnt __cleanup_mnt task_work_run exit_to_user_mode_loop el0_svc

On older kernels cancel_work_sync() on a zero-initialized work struct was a silent no-op, which hid the missing initialization.

Initialize reset_work once in ffs_data_new() so it is always valid for the lifetime of the ffs_data, and drop the now-redundant INIT_WORK() calls from the two deactivation paths.

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64594"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-06T08:16:34Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_fs: initialize reset_work at allocation time\n\nffs_fs_kill_sb() unconditionally calls cancel_work_sync() on\nffs-\u003ereset_work when a functionfs instance is unmounted:\n\n\tffs_data_reset(ffs);\n\tcancel_work_sync(\u0026ffs-\u003ereset_work);\n\nHowever ffs-\u003ereset_work is only ever initialized via INIT_WORK() in\nffs_func_set_alt() and ffs_func_disable(), and only on the\nFFS_DEACTIVATED path. That state is reached solely by ffs_data_closed()\nwhen the instance is mounted with the \"no_disconnect\" option, so for the\ncommon case (no \"no_disconnect\", or mounted and unmounted without ever\nbeing deactivated) reset_work is never initialized.\n\nffs_data_new() allocates the ffs_data with kzalloc_obj() and does not\ninitialize reset_work, and ffs_data_reset()/ffs_data_clear() do not touch\nit either, so reset_work.func is left NULL. cancel_work_sync() on such a\nwork then trips the WARN_ON(!work-\u003efunc) guard in __flush_work():\n\n  WARNING: kernel/workqueue.c:4301 at __flush_work+0x330/0x360, CPU#3: umount\n  Call trace:\n   __flush_work\n   cancel_work_sync\n   ffs_fs_kill_sb [usb_f_fs]\n   deactivate_locked_super\n   deactivate_super\n   cleanup_mnt\n   __cleanup_mnt\n   task_work_run\n   exit_to_user_mode_loop\n   el0_svc\n\nOn older kernels cancel_work_sync() on a zero-initialized work struct was\na silent no-op, which hid the missing initialization.\n\nInitialize reset_work once in ffs_data_new() so it is always valid for\nthe lifetime of the ffs_data, and drop the now-redundant INIT_WORK()\ncalls from the two deactivation paths.",
  "id": "GHSA-28fc-4vwx-pr32",
  "modified": "2026-08-06T09:30:33Z",
  "published": "2026-08-06T09:30:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64594"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0de6ebbabfbbc9c28350283dc97d8a519d5c6dd7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3137b243c93982fe3460335e12f9247739766e10"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/69faa3779250df14f51d5084f938a99809546e52"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7fe895e0a9651518c4fc082487da770ff9c14c7f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ba1867999dbc4085e6d8c52ac5266005b8b2bf07"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c36393b0d14e1e9783888f821ffe29381b8f46dc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cb19e54ebe9baf3c3243083ade65c937339ccb7b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d5631081be07f20e764d3cb5c98ac0a1004fba51"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-64594 (GCVE-0-2026-64594)

GHSA-28FC-4VWX-PR32

Tags

Sightings

Nomenclature