CVE-2024-36894

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2024-36894", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-30T15:25:07.066Z", "datePublished": "2024-05-30T15:28:59.689Z", "dateUpdated": "2026-10-15T00:42:38.622Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:31:53.288Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_fs: Fix race between aio_cancel() and AIO request complete\n\nFFS based applications can utilize the aio_cancel() callback to dequeue\npending USB requests submitted to the UDC. There is a scenario where the\nFFS application issues an AIO cancel call, while the UDC is handling a\nsoft disconnect. For a DWC3 based implementation, the callstack looks\nlike the following:\n\n DWC3 Gadget FFS Application\ndwc3_gadget_soft_disconnect() ...\n --> dwc3_stop_active_transfers()\n --> dwc3_gadget_giveback(-ESHUTDOWN)\n --> ffs_epfile_async_io_complete() ffs_aio_cancel()\n --> usb_ep_free_request() --> usb_ep_dequeue()\n\nThere is currently no locking implemented between the AIO completion\nhandler and AIO cancel, so the issue occurs if the completion routine is\nrunning in parallel to an AIO cancel call coming from the FFS application.\nAs the completion call frees the USB request (io_data->req) the FFS\napplication is also referencing it for the usb_ep_dequeue() call. This can\nlead to accessing a stale/hanging pointer.\n\ncommit b566d38857fc (\"usb: gadget: f_fs: use io_data->status consistently\")\nrelocated the usb_ep_free_request() into ffs_epfile_async_io_complete().\nHowever, in order to properly implement locking to mitigate this issue, the\nspinlock can't be added to ffs_epfile_async_io_complete(), as\nusb_ep_dequeue() (if successfully dequeuing a USB request) will call the\nfunction driver's completion handler in the same context. Hence, leading\ninto a deadlock.\n\nFix this issue by moving the usb_ep_free_request() back to\nffs_user_copy_worker(), and ensuring that it explicitly sets io_data->req\nto NULL after freeing it within the ffs->eps_lock. This resolves the race\ncondition above, as the ffs_aio_cancel() routine will not continue\nattempting to dequeue a request that has already been freed, or the\nffs_user_copy_work() not freeing the USB request until the AIO cancel is\ndone referencing it.\n\nThis fix depends on\n commit b566d38857fc (\"usb: gadget: f_fs: use io_data->status\n consistently\")"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - Both sides of the race are driven by local syscalls \u2014 `io_submit`/`io_cancel`/`io_destroy` on an AIO context plus `close()` of ep0 to force the mass `-ESHUTDOWN` giveback \u2014 with no USB host, cable, or physical access required. This is the gadget's userspace-facing API (f_fs), not a host-side driver parsing attacker-supplied descriptors, matching the AV:L precedent set for other gadget-side UAF races such as CVE-2024-38628.\nAC:L - The attacker controls both sides: it submits the AIO requests, triggers the bulk giveback that frees them, and then invokes `ffs_aio_cancel()` on every stale pointer at once via `free_ioctx_users()`. The ordered (max_active=1) `io_completion_wq` and the sleeping `kthread_use_mm`/`copy_to_iter` in the worker leave a huge window, and the whole sequence is freely repeatable.\nPR:L - The attacker needs an open descriptor on a functionfs endpoint file and an AIO context \u2014 available to any local unprivileged user in standard deployments, since ffs is mounted with `uid=`/`gid=`/`mode=` specifically to hand the endpoints to unprivileged daemons (adbd as `shell`, MTP as `media_rw`, embedded gadget daemons). No CAP_SYS_ADMIN is needed for the attack itself.\nUI:N - The attacking process performs every step itself \u2014 submit AIO, close ep0 to trigger the disconnect/giveback, then cancel/destroy the AIO context. No victim action is involved.\nS:U - The corruption is confined to kernel heap objects within the same security authority; there is no VM, IOMMU, or sandbox boundary crossed. This is standard local kernel privilege escalation.\nC:H - The use-after-free lets the attacker reclaim the freed `dwc3_request` slot with fully controlled data via the same fd (`ffs_alloc_buffer()` \u2192 `kmalloc` + `copy_from_iter_full`), after which `dwc3_gadget_ep_dequeue()`/`trace_dwc3_ep_dequeue()` dereference attacker-controlled pointers (`req->dep->name`, `req->td_data->status` on snps_udc), yielding an arbitrary kernel read primitive and leakage of adjacent heap contents.\nI:H - The stale request is passed to UDC dequeue routines that write into it and unlink it \u2014 `dwc3_gadget_giveback()` sets `req->request.status` and `list_del()`s the entry (arbitrary write via controlled list pointers), while `snps_udc_core::udc_dequeue()` performs no membership check and calls `complete_req()`, invoking `req->req.complete` \u2014 an indirect call through a function pointer read from freed, attacker-reclaimable memory, i.e. control-flow hijack.\nA:H - Even unweaponized, dereferencing the freed `usb_request` and the resulting double giveback/double free of `io_data` and its buffer reliably produce KASAN splats, slab corruption, and kernel panics. On a mass-disconnect the attacker triggers many of these at once with a single `io_destroy()`."}]}], "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": "2e4c7553cd6f9c68bb741582dcb614edcbeca70f", "lessThan": "f71a53148ce34898fef099b75386a3a9f4449311", "status": "affected", "versionType": "git"}, {"version": "2e4c7553cd6f9c68bb741582dcb614edcbeca70f", "lessThan": "9e72ef59cbe61cd1243857a6418ca92104275867", "status": "affected", "versionType": "git"}, {"version": "2e4c7553cd6f9c68bb741582dcb614edcbeca70f", "lessThan": "e500b1c4e29ad0bd1c1332a1eaea2913627a92dd", "status": "affected", "versionType": "git"}, {"version": "2e4c7553cd6f9c68bb741582dcb614edcbeca70f", "lessThan": "3613e5023f09b3308545e9d1acda86017ebd418a", "status": "affected", "versionType": "git"}, {"version": "2e4c7553cd6f9c68bb741582dcb614edcbeca70f", "lessThan": "a0fdccb1c9e027e3195f947f61aa87d6d0d2ea14", "status": "affected", "versionType": "git"}, {"version": "2e4c7553cd6f9c68bb741582dcb614edcbeca70f", "lessThan": "73c05ad46bb4fbbdb346004651576d1c8dbcffbb", "status": "affected", "versionType": "git"}, {"version": "2e4c7553cd6f9c68bb741582dcb614edcbeca70f", "lessThan": "d7461830823242702f5d84084bcccb25159003f4", "status": "affected", "versionType": "git"}, {"version": "2e4c7553cd6f9c68bb741582dcb614edcbeca70f", "lessThan": "24729b307eefcd7c476065cd7351c1a018082c19", "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": "3.15", "status": "affected"}, {"version": "0", "lessThan": "3.15", "status": "unaffected", "versionType": "semver"}, {"version": "4.19.317", 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Both sides of the race are driven by local syscalls \u2014 `io_submit`/`io_cancel`/`io_destroy` on an AIO context plus `close()` of ep0 to force the mass `-ESHUTDOWN` giveback \u2014 with no USB host, cable, or physical access required. This is the gadget's userspace-facing API (f_fs), not a host-side driver parsing attacker-supplied descriptors, matching the AV:L precedent set for other gadget-side UAF races such as CVE-2024-38628.\nAC:L - The attacker controls both sides: it submits the AIO requests, triggers the bulk giveback that frees them, and then invokes `ffs_aio_cancel()` on every stale pointer at once via `free_ioctx_users()`. The ordered (max_active=1) `io_completion_wq` and the sleeping `kthread_use_mm`/`copy_to_iter` in the worker leave a huge window, and the whole sequence is freely repeatable.\nPR:L - The attacker needs an open descriptor on a functionfs endpoint file and an AIO context \u2014 available to any local unprivileged user in standard deployments, since ffs is mounted with `uid=`/`gid=`/`mode=` specifically to hand the endpoints to unprivileged daemons (adbd as `shell`, MTP as `media_rw`, embedded gadget daemons). No CAP_SYS_ADMIN is needed for the attack itself.\nUI:N - The attacking process performs every step itself \u2014 submit AIO, close ep0 to trigger the disconnect/giveback, then cancel/destroy the AIO context. No victim action is involved.\nS:U - The corruption is confined to kernel heap objects within the same security authority; there is no VM, IOMMU, or sandbox boundary crossed. This is standard local kernel privilege escalation.\nC:H - The use-after-free lets the attacker reclaim the freed `dwc3_request` slot with fully controlled data via the same fd (`ffs_alloc_buffer()` \u2192 `kmalloc` + `copy_from_iter_full`), after which `dwc3_gadget_ep_dequeue()`/`trace_dwc3_ep_dequeue()` dereference attacker-controlled pointers (`req->dep->name`, `req->td_data->status` on snps_udc), yielding an arbitrary kernel read primitive and leakage of adjacent heap contents.\nI:H - The stale request is passed to UDC dequeue routines that write into it and unlink it \u2014 `dwc3_gadget_giveback()` sets `req->request.status` and `list_del()`s the entry (arbitrary write via controlled list pointers), while `snps_udc_core::udc_dequeue()` performs no membership check and calls `complete_req()`, invoking `req->req.complete` \u2014 an indirect call through a function pointer read from freed, attacker-reclaimable memory, i.e. control-flow hijack.\nA:H - Even unweaponized, dereferencing the freed `usb_request` and the resulting double giveback/double free of `io_data` and its buffer reliably produce KASAN splats, slab corruption, and kernel panics. On a mass-disconnect the attacker triggers many of these at once with a single `io_destroy()`."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2e4c7553cd6f9c68bb741582dcb614edcbeca70f", "lessThan": "f71a53148ce34898fef099b75386a3a9f4449311", "versionType": "git"}, {"status": "affected", "version": "2e4c7553cd6f9c68bb741582dcb614edcbeca70f", "lessThan": "9e72ef59cbe61cd1243857a6418ca92104275867", "versionType": "git"}, {"status": "affected", "version": "2e4c7553cd6f9c68bb741582dcb614edcbeca70f", "lessThan": "e500b1c4e29ad0bd1c1332a1eaea2913627a92dd", "versionType": "git"}, {"status": "affected", "version": "2e4c7553cd6f9c68bb741582dcb614edcbeca70f", "lessThan": "3613e5023f09b3308545e9d1acda86017ebd418a", "versionType": "git"}, {"status": "affected", "version": "2e4c7553cd6f9c68bb741582dcb614edcbeca70f", "lessThan": "a0fdccb1c9e027e3195f947f61aa87d6d0d2ea14", "versionType": "git"}, {"status": "affected", "version": "2e4c7553cd6f9c68bb741582dcb614edcbeca70f", "lessThan": "73c05ad46bb4fbbdb346004651576d1c8dbcffbb", "versionType": "git"}, {"status": "affected", "version": "2e4c7553cd6f9c68bb741582dcb614edcbeca70f", "lessThan": "d7461830823242702f5d84084bcccb25159003f4", "versionType": "git"}, {"status": "affected", "version": "2e4c7553cd6f9c68bb741582dcb614edcbeca70f", "lessThan": "24729b307eefcd7c476065cd7351c1a018082c19", "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": "3.15"}, {"status": "unaffected", "version": "0", "lessThan": "3.15", "versionType": "semver"}, {"status": "unaffected", "version": "4.19.317", "versionType": "semver", "lessThanOrEqual": "4.19.*"}, {"status": "unaffected", "version": "5.4.279", "versionType": "semver", "lessThanOrEqual": "5.4.*"}, {"status": "unaffected", "version": "5.10.221", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.162", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.95", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.31", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.8.10", "versionType": "semver", "lessThanOrEqual": "6.8.*"}, {"status": "unaffected", "version": "6.9", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/usb/gadget/function/f_fs.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/f71a53148ce34898fef099b75386a3a9f4449311"}, {"url": "https://git.kernel.org/stable/c/9e72ef59cbe61cd1243857a6418ca92104275867"}, {"url": "https://git.kernel.org/stable/c/e500b1c4e29ad0bd1c1332a1eaea2913627a92dd"}, {"url": "https://git.kernel.org/stable/c/3613e5023f09b3308545e9d1acda86017ebd418a"}, {"url": "https://git.kernel.org/stable/c/a0fdccb1c9e027e3195f947f61aa87d6d0d2ea14"}, {"url": "https://git.kernel.org/stable/c/73c05ad46bb4fbbdb346004651576d1c8dbcffbb"}, {"url": "https://git.kernel.org/stable/c/d7461830823242702f5d84084bcccb25159003f4"}, {"url": "https://git.kernel.org/stable/c/24729b307eefcd7c476065cd7351c1a018082c19"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_fs: Fix race between aio_cancel() and AIO request complete\n\nFFS based applications can utilize the aio_cancel() callback to dequeue\npending USB requests submitted to the UDC. There is a scenario where the\nFFS application issues an AIO cancel call, while the UDC is handling a\nsoft disconnect. For a DWC3 based implementation, the callstack looks\nlike the following:\n\n DWC3 Gadget FFS Application\ndwc3_gadget_soft_disconnect() ...\n --> dwc3_stop_active_transfers()\n --> dwc3_gadget_giveback(-ESHUTDOWN)\n --> ffs_epfile_async_io_complete() ffs_aio_cancel()\n --> usb_ep_free_request() --> usb_ep_dequeue()\n\nThere is currently no locking implemented between the AIO completion\nhandler and AIO cancel, so the issue occurs if the completion routine is\nrunning in parallel to an AIO cancel call coming from the FFS application.\nAs the completion call frees the USB request (io_data->req) the FFS\napplication is also referencing it for the usb_ep_dequeue() call. This can\nlead to accessing a stale/hanging pointer.\n\ncommit b566d38857fc (\"usb: gadget: f_fs: use io_data->status consistently\")\nrelocated the usb_ep_free_request() into ffs_epfile_async_io_complete().\nHowever, in order to properly implement locking to mitigate this issue, the\nspinlock can't be added to ffs_epfile_async_io_complete(), as\nusb_ep_dequeue() (if successfully dequeuing a USB request) will call the\nfunction driver's completion handler in the same context. Hence, leading\ninto a deadlock.\n\nFix this issue by moving the usb_ep_free_request() back to\nffs_user_copy_worker(), and ensuring that it explicitly sets io_data->req\nto NULL after freeing it within the ffs->eps_lock. This resolves the race\ncondition above, as the ffs_aio_cancel() routine will not continue\nattempting to dequeue a request that has already been freed, or the\nffs_user_copy_work() not freeing the USB request until the AIO cancel is\ndone referencing it.\n\nThis fix depends on\n commit b566d38857fc (\"usb: gadget: f_fs: use io_data->status\n consistently\")"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "4.19.317", "versionStartIncluding": "3.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.4.279", "versionStartIncluding": "3.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.221", "versionStartIncluding": "3.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.162", "versionStartIncluding": "3.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.95", "versionStartIncluding": "3.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.31", "versionStartIncluding": "3.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.8.10", "versionStartIncluding": "3.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.9", "versionStartIncluding": "3.15"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:31:53.288Z"}}}, "cveMetadata": {"cveId": "CVE-2024-36894", "state": "PUBLISHED", "dateUpdated": "2026-10-15T00:42:38.622Z", "dateReserved": "2024-05-30T15:25:07.066Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-05-30T15:28:59.689Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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aio_cancel() callback to dequeue\npending USB requests submitted to the UDC. There is a scenario where the\nFFS application issues an AIO cancel call, while the UDC is handling a\nsoft disconnect. For a DWC3 based implementation, the callstack looks\nlike the following:\n\n DWC3 Gadget FFS Application\ndwc3_gadget_soft_disconnect() ...\n --> dwc3_stop_active_transfers()\n --> dwc3_gadget_giveback(-ESHUTDOWN)\n --> ffs_epfile_async_io_complete() ffs_aio_cancel()\n --> usb_ep_free_request() --> usb_ep_dequeue()\n\nThere is currently no locking implemented between the AIO completion\nhandler and AIO cancel, so the issue occurs if the completion routine is\nrunning in parallel to an AIO cancel call coming from the FFS application.\nAs the completion call frees the USB request (io_data->req) the FFS\napplication is also referencing it for the usb_ep_dequeue() call. This can\nlead to accessing a stale/hanging pointer.\n\ncommit b566d38857fc (\"usb: gadget: f_fs: use io_data->status consistently\")\nrelocated the usb_ep_free_request() into ffs_epfile_async_io_complete().\nHowever, in order to properly implement locking to mitigate this issue, the\nspinlock can't be added to ffs_epfile_async_io_complete(), as\nusb_ep_dequeue() (if successfully dequeuing a USB request) will call the\nfunction driver's completion handler in the same context. Hence, leading\ninto a deadlock.\n\nFix this issue by moving the usb_ep_free_request() back to\nffs_user_copy_worker(), and ensuring that it explicitly sets io_data->req\nto NULL after freeing it within the ffs->eps_lock. This resolves the race\ncondition above, as the ffs_aio_cancel() routine will not continue\nattempting to dequeue a request that has already been freed, or the\nffs_user_copy_work() not freeing the USB request until the AIO cancel is\ndone referencing it.\n\nThis fix depends on\n commit b566d38857fc (\"usb: gadget: f_fs: use io_data->status\n consistently\")"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: usb: gadget: f_fs: corrige la ejecuci\u00f3n entre aio_cancel() y la solicitud AIO. Las aplicaciones basadas en FFS completas pueden utilizar la devoluci\u00f3n de llamada aio_cancel() para quitar de la cola las solicitudes USB pendientes enviadas al UDC. Existe un escenario en el que la aplicaci\u00f3n FFS emite una llamada de cancelaci\u00f3n de AIO, mientras el UDC maneja una desconexi\u00f3n suave. Para una implementaci\u00f3n basada en DWC3, la pila de llamadas se parece a la siguiente: Aplicaci\u00f3n DWC3 Gadget FFS dwc3_gadget_soft_disconnect() ... --> dwc3_stop_active_transfers() --> dwc3_gadget_giveback(-ESHUTDOWN) --> ffs_epfile_async_io_complete() ffs_aio_cancel() --> usb_ep_free_request () --> usb_ep_dequeue() Actualmente no hay ning\u00fan bloqueo implementado entre el controlador de finalizaci\u00f3n de AIO y la cancelaci\u00f3n de AIO, por lo que el problema ocurre si la rutina de finalizaci\u00f3n se ejecuta en paralelo a una llamada de cancelaci\u00f3n de AIO proveniente de la aplicaci\u00f3n FFS. A medida que la llamada de finalizaci\u00f3n libera la solicitud USB (io_data->req), la aplicaci\u00f3n FFS tambi\u00e9n hace referencia a ella para la llamada usb_ep_dequeue(). Esto puede llevar a acceder a un puntero obsoleto/colgado. commit b566d38857fc (\"usb: gadget: f_fs: use io_data->status consistentemente\") reubic\u00f3 usb_ep_free_request() en ffs_epfile_async_io_complete(). Sin embargo, para implementar correctamente el bloqueo para mitigar este problema, el spinlock no se puede agregar a ffs_epfile_async_io_complete(), ya que usb_ep_dequeue() (si se elimina con \u00e9xito una solicitud USB) llamar\u00e1 al controlador de finalizaci\u00f3n del controlador de funci\u00f3n en el mismo contexto. De ah\u00ed que se llegue a un punto muerto. Solucione este problema moviendo usb_ep_free_request() de nuevo a ffs_user_copy_worker() y asegur\u00e1ndose de que establezca expl\u00edcitamente io_data->req en NULL despu\u00e9s de liberarlo dentro de ffs->eps_lock. Esto resuelve la condici\u00f3n de ejecuci\u00f3n anterior, ya que la rutina ffs_aio_cancel() no continuar\u00e1 intentando sacar de la cola una solicitud que ya ha sido liberada, o ffs_user_copy_work() no liberar\u00e1 la solicitud USB hasta que la cancelaci\u00f3n de AIO termine de hacer referencia a ella. Esta soluci\u00f3n depende de el commit b566d38857fc (\"usb: gadget: f_fs: use io_data->status consistentemente\")"}], "id": "CVE-2024-36894", "lastModified": "2026-10-15T01:18:23.303", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "PHYSICAL", "availabilityImpact": "HIGH", "baseScore": 5.6, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:P/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 0.4, "impactScore": 5.2, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-36894", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-06-03T15:53:00.949597Z", "version": "2.0.3"}}]}, "published": "2024-05-30T16:15:12.857", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/24729b307eefcd7c476065cd7351c1a018082c19"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3613e5023f09b3308545e9d1acda86017ebd418a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/73c05ad46bb4fbbdb346004651576d1c8dbcffbb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9e72ef59cbe61cd1243857a6418ca92104275867"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a0fdccb1c9e027e3195f947f61aa87d6d0d2ea14"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d7461830823242702f5d84084bcccb25159003f4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e500b1c4e29ad0bd1c1332a1eaea2913627a92dd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f71a53148ce34898fef099b75386a3a9f4449311"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/24729b307eefcd7c476065cd7351c1a018082c19"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3613e5023f09b3308545e9d1acda86017ebd418a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/73c05ad46bb4fbbdb346004651576d1c8dbcffbb"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9e72ef59cbe61cd1243857a6418ca92104275867"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a0fdccb1c9e027e3195f947f61aa87d6d0d2ea14"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d7461830823242702f5d84084bcccb25159003f4"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e500b1c4e29ad0bd1c1332a1eaea2913627a92dd"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f71a53148ce34898fef099b75386a3a9f4449311"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-355557.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: usb: gadget: f_fs: Fix race between aio_cancel() and AIO request complete", "id": "2284561", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2284561"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-362", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nusb: gadget: f_fs: Fix race between aio_cancel() and AIO request complete\nFFS based applications can utilize the aio_cancel() callback to dequeue\npending USB requests submitted to the UDC. There is a scenario where the\nFFS application issues an AIO cancel call, while the UDC is handling a\nsoft disconnect. For a DWC3 based implementation, the callstack looks\nlike the following:\nDWC3 Gadget FFS Application\ndwc3_gadget_soft_disconnect() ...\n--> dwc3_stop_active_transfers()\n--> dwc3_gadget_giveback(-ESHUTDOWN)\n--> ffs_epfile_async_io_complete() ffs_aio_cancel()\n--> usb_ep_free_request() --> usb_ep_dequeue()\nThere is currently no locking implemented between the AIO completion\nhandler and AIO cancel, so the issue occurs if the completion routine is\nrunning in parallel to an AIO cancel call coming from the FFS application.\nAs the completion call frees the USB request (io_data->req) the FFS\napplication is also referencing it for the usb_ep_dequeue() call. This can\nlead to accessing a stale/hanging pointer.\ncommit b566d38857fc (\"usb: gadget: f_fs: use io_data->status consistently\")\nrelocated the usb_ep_free_request() into ffs_epfile_async_io_complete().\nHowever, in order to properly implement locking to mitigate this issue, the\nspinlock can't be added to ffs_epfile_async_io_complete(), as\nusb_ep_dequeue() (if successfully dequeuing a USB request) will call the\nfunction driver's completion handler in the same context. Hence, leading\ninto a deadlock.\nFix this issue by moving the usb_ep_free_request() back to\nffs_user_copy_worker(), and ensuring that it explicitly sets io_data->req\nto NULL after freeing it within the ffs->eps_lock. This resolves the race\ncondition above, as the ffs_aio_cancel() routine will not continue\nattempting to dequeue a request that has already been freed, or the\nffs_user_copy_work() not freeing the USB request until the AIO cancel is\ndone referencing it.\nThis fix depends on\ncommit b566d38857fc (\"usb: gadget: f_fs: use io_data->status\nconsistently\")"], "name": "CVE-2024-36894", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-30T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-36894\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-36894\nhttps://lore.kernel.org/linux-cve-announce/2024053034-CVE-2024-36894-b44b@gregkh/T"], "threat_severity": "Low"}

{}