{"id":"CVE-2026-31667","revision":null,"records":[{"revision":"bee6b7a68d334495ba904bc621a6db3d","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-31667","aliases":[],"title":"Input: uinput - fix circular locking dependency with ff-core","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nInput: uinput - fix circular locking dependency with ff-core\n\nA lockdep circular locking dependency warning can be triggered\nreproducibly when using a force-feedback gamepad with uinput (for\nexample, playing ELDEN RING under Wine with a Flydigi Vader 5\ncontroller):\n\n ff->mutex -> udev->mutex -> input_mutex -> dev->mutex -> ff->mutex\n\nThe cycle is caused by four lock acquisition paths:\n\n1. ff upload: input_ff_upload() holds ff->mutex and calls\n uinput_dev_upload_effect() -> uinput_request_submit() ->\n uinput_request_send(), which acquires udev->mutex.\n\n2. device create: uinput_ioctl_handler() holds udev->mutex and calls\n uinput_create_device() -> input_register_device(), which acquires\n input_mutex.\n\n3. device register: input_register_device() holds input_mutex and\n calls kbd_connect() -> input_register_handle(), which acquires\n dev->mutex.\n\n4. evdev release: evdev_release() calls input_flush_device() under\n dev->mutex, which calls input_ff_flush() acquiring ff->mutex.\n\nFix this by introducing a new state_lock spinlock to protect\nudev->state and udev->dev access in uinput_request_send() instead of\nacquiring udev->mutex. The function only needs to atomically check\ndevice state and queue an input event into the ring buffer via\nuinput_dev_event() -- both operations are safe under a spinlock\n(ktime_get_ts64() and wake_up_interruptible() do not sleep). This\nbreaks the ff->mutex -> udev->mutex link since a spinlock is a leaf in\nthe lock ordering and cannot form cycles with mutexes.\n\nTo keep state transitions visible to uinput_request_send(), protect\nwrites to udev->state in uinput_create_device() and\nuinput_destroy_device() with the same state_lock spinlock.\n\nAdditionally, move init_completion(&request->done) from\nuinput_request_send() to uinput_request_submit() before\nuinput_request_reserve_slot(). Once the slot is allocated,\nuinput_flush_requests() may call complete() on it at any time from\nthe destroy path, so the completion must be initialised before the\nrequest becomes visible.\n\nLock ordering after the fix:\n\n ff->mutex -> state_lock (spinlock, leaf)\n udev->mutex -> state_lock (spinlock, leaf)\n udev->mutex -> input_mutex -> dev->mutex -> ff->mutex (no back-edge)","state":0,"publishedAt":"2026-04-24T14:45:15.937+00:00","modifiedAt":"2026-10-19T18:56:02.976+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/input/misc/uinput.c\"\n ],\n \"versions\": [\n {\n \"version\": \"ff462551235d8d7d843a005950bc90924fcedede\",\n \"lessThan\": \"71a9729f412e2c692a35c542e14b706fb342927f\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ff462551235d8d7d843a005950bc90924fcedede\",\n \"lessThan\": \"271ee71a1917b89f6d73ec82dd091c33d92ee617\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ff462551235d8d7d843a005950bc90924fcedede\",\n \"lessThan\": \"974f7b138c3a96dd5cd53d1b33409cd7b2229dc6\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ff462551235d8d7d843a005950bc90924fcedede\",\n \"lessThan\": \"546c18a14924eb521fe168d916d7ce28f1e13c1d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ff462551235d8d7d843a005950bc90924fcedede\",\n \"lessThan\": \"a3d6c9c053c9c605651508569230ead633b13f76\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ff462551235d8d7d843a005950bc90924fcedede\",\n \"lessThan\": \"1e09dfbb4f5d20ee111f92325a00f85778a5f328\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ff462551235d8d7d843a005950bc90924fcedede\",\n \"lessThan\": \"1534661043c434b81cfde26b97a2fb2460329cf0\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ff462551235d8d7d843a005950bc90924fcedede\",\n \"lessThan\": \"4cda78d6f8bf2b700529f2fbccb994c3e826d7c2\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/input/misc/uinput.c\"\n ],\n \"versions\": [\n {\n \"version\": \"2.6.19\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"2.6.19\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.253\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.203\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.169\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.135\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.82\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.23\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.19.13\",\n \"lessThanOrEqual\": \"6.19.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.0\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/71a9729f412e2c692a35c542e14b706fb342927f","https://git.kernel.org/stable/c/271ee71a1917b89f6d73ec82dd091c33d92ee617","https://git.kernel.org/stable/c/974f7b138c3a96dd5cd53d1b33409cd7b2229dc6","https://git.kernel.org/stable/c/546c18a14924eb521fe168d916d7ce28f1e13c1d","https://git.kernel.org/stable/c/a3d6c9c053c9c605651508569230ead633b13f76","https://git.kernel.org/stable/c/1e09dfbb4f5d20ee111f92325a00f85778a5f328","https://git.kernel.org/stable/c/1534661043c434b81cfde26b97a2fb2460329cf0","https://git.kernel.org/stable/c/4cda78d6f8bf2b700529f2fbccb994c3e826d7c2"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-31667","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-31667","identifiers":["CVE-2026-31667"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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