CVE-2026-64594
Estado: RecibidaSin puntuar—
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:
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.
Leer descripción completaMostrar menos
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():
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.
Detalles técnicos trazas, registros y código del informe original
ffs_data_reset(ffs); cancel_work_sync(&ffs->reset_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
CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.22%
- Percentil entre todas las CVEs puntuadas: 11
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
- https://git.kernel.org/stable/c/0de6ebbabfbbc9c28350283dc97d8a519d5c6dd7
- https://git.kernel.org/stable/c/3137b243c93982fe3460335e12f9247739766e10
- https://git.kernel.org/stable/c/69faa3779250df14f51d5084f938a99809546e52
- https://git.kernel.org/stable/c/7fe895e0a9651518c4fc082487da770ff9c14c7f
- https://git.kernel.org/stable/c/ba1867999dbc4085e6d8c52ac5266005b8b2bf07
- https://git.kernel.org/stable/c/c36393b0d14e1e9783888f821ffe29381b8f46dc
- https://git.kernel.org/stable/c/cb19e54ebe9baf3c3243083ade65c937339ccb7b
- https://git.kernel.org/stable/c/d5631081be07f20e764d3cb5c98ac0a1004fba51
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-64594",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "18d6b32fca3841f7cd9479b4024abd8a9b299281",
"lessThan": "7fe895e0a9651518c4fc082487da770ff9c14c7f",
"versionType": "git"
},
{
"status": "affected",
"version": "18d6b32fca3841f7cd9479b4024abd8a9b299281",
"lessThan": "0de6ebbabfbbc9c28350283dc97d8a519d5c6dd7",
"versionType": "git"
},
{
"status": "affected",
"version": "18d6b32fca3841f7cd9479b4024abd8a9b299281",
"lessThan": "cb19e54ebe9baf3c3243083ade65c937339ccb7b",
"versionType": "git"
},
{
"status": "affected",
"version": "18d6b32fca3841f7cd9479b4024abd8a9b299281",
"lessThan": "d5631081be07f20e764d3cb5c98ac0a1004fba51",
"versionType": "git"
},
{
"status": "affected",
"version": "18d6b32fca3841f7cd9479b4024abd8a9b299281",
"lessThan": "c36393b0d14e1e9783888f821ffe29381b8f46dc",
"versionType": "git"
},
{
"status": "affected",
"version": "18d6b32fca3841f7cd9479b4024abd8a9b299281",
"lessThan": "69faa3779250df14f51d5084f938a99809546e52",
"versionType": "git"
},
{
"status": "affected",
"version": "18d6b32fca3841f7cd9479b4024abd8a9b299281",
"lessThan": "ba1867999dbc4085e6d8c52ac5266005b8b2bf07",
"versionType": "git"
},
{
"status": "affected",
"version": "18d6b32fca3841f7cd9479b4024abd8a9b299281",
"lessThan": "3137b243c93982fe3460335e12f9247739766e10",
"versionType": "git"
}
],
"programFiles": [
"drivers/usb/gadget/function/f_fs.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.0"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.0",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.261",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.4",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/usb/gadget/function/f_fs.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-08-06T08:16:34.933",
"references": [
{
"url": "https://git.kernel.org/stable/c/0de6ebbabfbbc9c28350283dc97d8a519d5c6dd7",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/3137b243c93982fe3460335e12f9247739766e10",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/69faa3779250df14f51d5084f938a99809546e52",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/7fe895e0a9651518c4fc082487da770ff9c14c7f",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/ba1867999dbc4085e6d8c52ac5266005b8b2bf07",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/c36393b0d14e1e9783888f821ffe29381b8f46dc",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/cb19e54ebe9baf3c3243083ade65c937339ccb7b",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/d5631081be07f20e764d3cb5c98ac0a1004fba51",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"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->reset_work when a functionfs instance is unmounted:\n\n\tffs_data_reset(ffs);\n\tcancel_work_sync(&ffs->reset_work);\n\nHowever ffs->reset_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->func) 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."
}
],
"lastModified": "2026-08-17T05:18:05.890",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}