{"api_version":"1","generated_at":"2026-08-08T09:55:27+00:00","cve":"CVE-2026-64594","urls":{"html":"https://cve.report/CVE-2026-64594","api":"https://cve.report/api/cve/CVE-2026-64594.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64594","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64594"},"summary":{"title":"usb: gadget: f_fs: initialize reset_work at allocation time","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-06 08:16:34","updated_at":"2026-08-06 08:16:34"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/c36393b0d14e1e9783888f821ffe29381b8f46dc","name":"https://git.kernel.org/stable/c/c36393b0d14e1e9783888f821ffe29381b8f46dc","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7fe895e0a9651518c4fc082487da770ff9c14c7f","name":"https://git.kernel.org/stable/c/7fe895e0a9651518c4fc082487da770ff9c14c7f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0de6ebbabfbbc9c28350283dc97d8a519d5c6dd7","name":"https://git.kernel.org/stable/c/0de6ebbabfbbc9c28350283dc97d8a519d5c6dd7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3137b243c93982fe3460335e12f9247739766e10","name":"https://git.kernel.org/stable/c/3137b243c93982fe3460335e12f9247739766e10","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ba1867999dbc4085e6d8c52ac5266005b8b2bf07","name":"https://git.kernel.org/stable/c/ba1867999dbc4085e6d8c52ac5266005b8b2bf07","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/cb19e54ebe9baf3c3243083ade65c937339ccb7b","name":"https://git.kernel.org/stable/c/cb19e54ebe9baf3c3243083ade65c937339ccb7b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/69faa3779250df14f51d5084f938a99809546e52","name":"https://git.kernel.org/stable/c/69faa3779250df14f51d5084f938a99809546e52","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d5631081be07f20e764d3cb5c98ac0a1004fba51","name":"https://git.kernel.org/stable/c/d5631081be07f20e764d3cb5c98ac0a1004fba51","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64594","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64594","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 18d6b32fca3841f7cd9479b4024abd8a9b299281 7fe895e0a9651518c4fc082487da770ff9c14c7f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 18d6b32fca3841f7cd9479b4024abd8a9b299281 0de6ebbabfbbc9c28350283dc97d8a519d5c6dd7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 18d6b32fca3841f7cd9479b4024abd8a9b299281 cb19e54ebe9baf3c3243083ade65c937339ccb7b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 18d6b32fca3841f7cd9479b4024abd8a9b299281 d5631081be07f20e764d3cb5c98ac0a1004fba51 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 18d6b32fca3841f7cd9479b4024abd8a9b299281 c36393b0d14e1e9783888f821ffe29381b8f46dc git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 18d6b32fca3841f7cd9479b4024abd8a9b299281 69faa3779250df14f51d5084f938a99809546e52 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 18d6b32fca3841f7cd9479b4024abd8a9b299281 ba1867999dbc4085e6d8c52ac5266005b8b2bf07 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 18d6b32fca3841f7cd9479b4024abd8a9b299281 3137b243c93982fe3460335e12f9247739766e10 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.0","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.0 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.261 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.212 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.178 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.145 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.97 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.40 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.4 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"64594","cve":"CVE-2026-64594","epss":"0.001640000","percentile":"0.060460000","score_date":"2026-08-07","updated_at":"2026-08-08 00:14:58"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/usb/gadget/function/f_fs.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"7fe895e0a9651518c4fc082487da770ff9c14c7f","status":"affected","version":"18d6b32fca3841f7cd9479b4024abd8a9b299281","versionType":"git"},{"lessThan":"0de6ebbabfbbc9c28350283dc97d8a519d5c6dd7","status":"affected","version":"18d6b32fca3841f7cd9479b4024abd8a9b299281","versionType":"git"},{"lessThan":"cb19e54ebe9baf3c3243083ade65c937339ccb7b","status":"affected","version":"18d6b32fca3841f7cd9479b4024abd8a9b299281","versionType":"git"},{"lessThan":"d5631081be07f20e764d3cb5c98ac0a1004fba51","status":"affected","version":"18d6b32fca3841f7cd9479b4024abd8a9b299281","versionType":"git"},{"lessThan":"c36393b0d14e1e9783888f821ffe29381b8f46dc","status":"affected","version":"18d6b32fca3841f7cd9479b4024abd8a9b299281","versionType":"git"},{"lessThan":"69faa3779250df14f51d5084f938a99809546e52","status":"affected","version":"18d6b32fca3841f7cd9479b4024abd8a9b299281","versionType":"git"},{"lessThan":"ba1867999dbc4085e6d8c52ac5266005b8b2bf07","status":"affected","version":"18d6b32fca3841f7cd9479b4024abd8a9b299281","versionType":"git"},{"lessThan":"3137b243c93982fe3460335e12f9247739766e10","status":"affected","version":"18d6b32fca3841f7cd9479b4024abd8a9b299281","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/usb/gadget/function/f_fs.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.0"},{"lessThan":"4.0","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.261","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.212","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.178","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.145","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.97","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.40","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.261","versionStartIncluding":"4.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.212","versionStartIncluding":"4.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.178","versionStartIncluding":"4.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.145","versionStartIncluding":"4.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.97","versionStartIncluding":"4.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.40","versionStartIncluding":"4.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.4","versionStartIncluding":"4.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc3","versionStartIncluding":"4.0","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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."}],"providerMetadata":{"dateUpdated":"2026-08-06T07:13:50.309Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/7fe895e0a9651518c4fc082487da770ff9c14c7f"},{"url":"https://git.kernel.org/stable/c/0de6ebbabfbbc9c28350283dc97d8a519d5c6dd7"},{"url":"https://git.kernel.org/stable/c/cb19e54ebe9baf3c3243083ade65c937339ccb7b"},{"url":"https://git.kernel.org/stable/c/d5631081be07f20e764d3cb5c98ac0a1004fba51"},{"url":"https://git.kernel.org/stable/c/c36393b0d14e1e9783888f821ffe29381b8f46dc"},{"url":"https://git.kernel.org/stable/c/69faa3779250df14f51d5084f938a99809546e52"},{"url":"https://git.kernel.org/stable/c/ba1867999dbc4085e6d8c52ac5266005b8b2bf07"},{"url":"https://git.kernel.org/stable/c/3137b243c93982fe3460335e12f9247739766e10"}],"title":"usb: gadget: f_fs: initialize reset_work at allocation time","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64594","datePublished":"2026-08-06T07:13:50.309Z","dateReserved":"2026-07-19T15:36:31.799Z","dateUpdated":"2026-08-06T07:13:50.309Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-06 08:16:34","lastModifiedDate":"2026-08-06 08:16:34","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64594","Ordinal":"1","Title":"usb: gadget: f_fs: initialize reset_work at allocation time","CVE":"CVE-2026-64594","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64594","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"usb: gadget: f_fs: initialize reset_work at allocation time"}]}}}