{"id":"CVE-2026-89736","revision":null,"records":[{"revision":"804cfae317ec4a119e31fd867c9ed04b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89736","aliases":[],"title":"usb: gadget: u_audio: Fix use-after-free on sound card disconnect","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: u_audio: Fix use-after-free on sound card disconnect\n\ng_audio_cleanup() invokes snd_card_free_when_closed() to initiate sound\ncard teardown and immediately frees the underlying struct snd_uac_chip\ncontext. However, snd_card_free_when_closed() returns asynchronously\nwhile ALSA control elements (kctls) remain open in userspace.\n\nWhen userspace control applications access or close these open file\ndescriptors, kctl callbacks attempt to dereference kctl->private_data\npointing to &uac->c_prm or &uac->p_prm within the freed uac structure,\nresulting in a use-after-free (UAF) memory corruption.\n\nFix this issue by deferring the destruction of struct snd_uac_chip until\nall references to the ALSA sound card are released. Register a custom\ncard->private_free callback (u_audio_card_free) during g_audio_setup()\nthat frees uac and its associated playback/capture request and ring\nbuffers only when the sound card reference count drops to zero.","state":0,"publishedAt":"2026-09-11T19:46:44.608+00:00","modifiedAt":"2026-10-19T08:51:50.34+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/usb/gadget/function/u_audio.c\"\n ],\n \"versions\": [\n {\n \"version\": \"33f341c1fc60e172a3515c51bdabee11e83d1ee9\",\n \"lessThan\": \"a7ecd1a04f4f485d7be6443d0f0b2c61a800cb82\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b131989797f7287d7fdadb2bababc05a15d44750\",\n \"lessThan\": \"f983793f03148b097977f200298db215cd2d4438\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"3bc7324e4911351e39c54a62e6ca46321cb10faf\",\n \"lessThan\": \"6f46762196f04464e1050a9ee94e72b917db9010\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"6c67ed9ad9b83e453e808f9b31a931a20a25629b\",\n \"lessThan\": \"891a8d11f4d5eb50b2ce7570f4f98204a7a57493\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"6c67ed9ad9b83e453e808f9b31a931a20a25629b\",\n \"lessThan\": \"c74ff0b1a0fca53d3ac185873c87d6a719b30a47\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"6c67ed9ad9b83e453e808f9b31a931a20a25629b\",\n \"lessThan\": \"4e747c864a88537e18b1ffc19a1954c9686bb8e1\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"6c67ed9ad9b83e453e808f9b31a931a20a25629b\",\n \"lessThan\": \"79a92896e2bb9471550c56fc23d8d93592f04c27\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"6c67ed9ad9b83e453e808f9b31a931a20a25629b\",\n \"lessThan\": \"858965947081d10d41d9a1010a540d3d5eea958b\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"3e016ef2e72da93a2ea7afbb45de1b481b44d761\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"3256e152b645fc1e788ba44c2d8ced690113e3e6\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"0eda2004f38d95ef5715d62be884cd344260535b\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"43ca70753dfffd517d2af126da28690f8f615605\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5.10.177\",\n \"lessThan\": \"5.10.270\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.105\",\n \"lessThan\": \"5.15.221\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.22\",\n \"lessThan\": \"6.1.188\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"4.14.312\",\n \"lessThan\": \"4.15\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"4.19.280\",\n \"lessThan\": \"4.20\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.4.240\",\n \"lessThan\": \"5.5\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.2.9\",\n \"lessThan\": \"6.3\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\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/usb/gadget/function/u_audio.c\"\n ],\n \"versions\": [\n {\n \"version\": \"6.3\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"6.3\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.270\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.221\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.188\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.157\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.109\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.50\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2.4\",\n \"lessThanOrEqual\": \"7.2.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.3\",\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/a7ecd1a04f4f485d7be6443d0f0b2c61a800cb82","https://git.kernel.org/stable/c/f983793f03148b097977f200298db215cd2d4438","https://git.kernel.org/stable/c/6f46762196f04464e1050a9ee94e72b917db9010","https://git.kernel.org/stable/c/891a8d11f4d5eb50b2ce7570f4f98204a7a57493","https://git.kernel.org/stable/c/c74ff0b1a0fca53d3ac185873c87d6a719b30a47","https://git.kernel.org/stable/c/4e747c864a88537e18b1ffc19a1954c9686bb8e1","https://git.kernel.org/stable/c/79a92896e2bb9471550c56fc23d8d93592f04c27","https://git.kernel.org/stable/c/858965947081d10d41d9a1010a540d3d5eea958b"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89736","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89736","identifiers":["CVE-2026-89736"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all 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