{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-64594", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.799Z", "datePublished": "2026-08-06T07:13:50.309Z", "dateUpdated": "2026-08-17T04:58:16.410Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T04:58:16.410Z" }, "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." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/usb/gadget/function/f_fs.c" ], "versions": [ { "version": "18d6b32fca3841f7cd9479b4024abd8a9b299281", "lessThan": "7fe895e0a9651518c4fc082487da770ff9c14c7f", "status": "affected", "versionType": "git" }, { "version": "18d6b32fca3841f7cd9479b4024abd8a9b299281", "lessThan": "0de6ebbabfbbc9c28350283dc97d8a519d5c6dd7", "status": "affected", "versionType": "git" }, { "version": "18d6b32fca3841f7cd9479b4024abd8a9b299281", "lessThan": "cb19e54ebe9baf3c3243083ade65c937339ccb7b", "status": "affected", "versionType": "git" }, { "version": "18d6b32fca3841f7cd9479b4024abd8a9b299281", "lessThan": "d5631081be07f20e764d3cb5c98ac0a1004fba51", "status": "affected", "versionType": "git" }, { "version": "18d6b32fca3841f7cd9479b4024abd8a9b299281", "lessThan": "c36393b0d14e1e9783888f821ffe29381b8f46dc", "status": "affected", "versionType": "git" }, { "version": "18d6b32fca3841f7cd9479b4024abd8a9b299281", "lessThan": "69faa3779250df14f51d5084f938a99809546e52", "status": "affected", "versionType": "git" }, { "version": "18d6b32fca3841f7cd9479b4024abd8a9b299281", "lessThan": "ba1867999dbc4085e6d8c52ac5266005b8b2bf07", "status": "affected", "versionType": "git" }, { "version": "18d6b32fca3841f7cd9479b4024abd8a9b299281", "lessThan": "3137b243c93982fe3460335e12f9247739766e10", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/usb/gadget/function/f_fs.c" ], "versions": [ { "version": "4.0", "status": "affected" }, { "version": "0", "lessThan": "4.0", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.4", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "5.10.261" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "7.1.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.0", "versionEndExcluding": "7.2" } ] } ] } ], "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" } } } }