{"api_version":"1","generated_at":"2026-09-12T02:38:36+00:00","cve":"CVE-2026-89736","urls":{"html":"https://cve.report/CVE-2026-89736","api":"https://cve.report/api/cve/CVE-2026-89736.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-89736","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-89736"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-09-11 20:20:04","updated_at":"2026-09-11 20:20:04"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/79a92896e2bb9471550c56fc23d8d93592f04c27","name":"https://git.kernel.org/stable/c/79a92896e2bb9471550c56fc23d8d93592f04c27","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4e747c864a88537e18b1ffc19a1954c9686bb8e1","name":"https://git.kernel.org/stable/c/4e747c864a88537e18b1ffc19a1954c9686bb8e1","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/858965947081d10d41d9a1010a540d3d5eea958b","name":"https://git.kernel.org/stable/c/858965947081d10d41d9a1010a540d3d5eea958b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/c74ff0b1a0fca53d3ac185873c87d6a719b30a47","name":"https://git.kernel.org/stable/c/c74ff0b1a0fca53d3ac185873c87d6a719b30a47","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89736","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89736","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6c67ed9ad9b83e453e808f9b31a931a20a25629b c74ff0b1a0fca53d3ac185873c87d6a719b30a47 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6c67ed9ad9b83e453e808f9b31a931a20a25629b 4e747c864a88537e18b1ffc19a1954c9686bb8e1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6c67ed9ad9b83e453e808f9b31a931a20a25629b 79a92896e2bb9471550c56fc23d8d93592f04c27 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6c67ed9ad9b83e453e808f9b31a931a20a25629b 858965947081d10d41d9a1010a540d3d5eea958b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3e016ef2e72da93a2ea7afbb45de1b481b44d761 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3256e152b645fc1e788ba44c2d8ced690113e3e6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 0eda2004f38d95ef5715d62be884cd344260535b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 33f341c1fc60e172a3515c51bdabee11e83d1ee9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected b131989797f7287d7fdadb2bababc05a15d44750 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3bc7324e4911351e39c54a62e6ca46321cb10faf git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 43ca70753dfffd517d2af126da28690f8f615605 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.14.312 4.15 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.19.280 4.20 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.4.240 5.5 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.10.177 5.11 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.15.105 5.16 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.1.22 6.2 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.2.9 6.3 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.3","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.3 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.109 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.50 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.4 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/usb/gadget/function/u_audio.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"c74ff0b1a0fca53d3ac185873c87d6a719b30a47","status":"affected","version":"6c67ed9ad9b83e453e808f9b31a931a20a25629b","versionType":"git"},{"lessThan":"4e747c864a88537e18b1ffc19a1954c9686bb8e1","status":"affected","version":"6c67ed9ad9b83e453e808f9b31a931a20a25629b","versionType":"git"},{"lessThan":"79a92896e2bb9471550c56fc23d8d93592f04c27","status":"affected","version":"6c67ed9ad9b83e453e808f9b31a931a20a25629b","versionType":"git"},{"lessThan":"858965947081d10d41d9a1010a540d3d5eea958b","status":"affected","version":"6c67ed9ad9b83e453e808f9b31a931a20a25629b","versionType":"git"},{"status":"affected","version":"3e016ef2e72da93a2ea7afbb45de1b481b44d761","versionType":"git"},{"status":"affected","version":"3256e152b645fc1e788ba44c2d8ced690113e3e6","versionType":"git"},{"status":"affected","version":"0eda2004f38d95ef5715d62be884cd344260535b","versionType":"git"},{"status":"affected","version":"33f341c1fc60e172a3515c51bdabee11e83d1ee9","versionType":"git"},{"status":"affected","version":"b131989797f7287d7fdadb2bababc05a15d44750","versionType":"git"},{"status":"affected","version":"3bc7324e4911351e39c54a62e6ca46321cb10faf","versionType":"git"},{"status":"affected","version":"43ca70753dfffd517d2af126da28690f8f615605","versionType":"git"},{"lessThan":"4.15","status":"affected","version":"4.14.312","versionType":"semver"},{"lessThan":"4.20","status":"affected","version":"4.19.280","versionType":"semver"},{"lessThan":"5.5","status":"affected","version":"5.4.240","versionType":"semver"},{"lessThan":"5.11","status":"affected","version":"5.10.177","versionType":"semver"},{"lessThan":"5.16","status":"affected","version":"5.15.105","versionType":"semver"},{"lessThan":"6.2","status":"affected","version":"6.1.22","versionType":"semver"},{"lessThan":"6.3","status":"affected","version":"6.2.9","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/usb/gadget/function/u_audio.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.3"},{"lessThan":"6.3","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.109","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.50","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.109","versionStartIncluding":"6.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.50","versionStartIncluding":"6.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.4","versionStartIncluding":"6.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"6.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14.312","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19.280","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.240","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.177","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.105","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.22","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2.9","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"providerMetadata":{"dateUpdated":"2026-09-11T19:46:44.608Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/c74ff0b1a0fca53d3ac185873c87d6a719b30a47"},{"url":"https://git.kernel.org/stable/c/4e747c864a88537e18b1ffc19a1954c9686bb8e1"},{"url":"https://git.kernel.org/stable/c/79a92896e2bb9471550c56fc23d8d93592f04c27"},{"url":"https://git.kernel.org/stable/c/858965947081d10d41d9a1010a540d3d5eea958b"}],"title":"usb: gadget: u_audio: Fix use-after-free on sound card disconnect","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-89736","datePublished":"2026-09-11T19:46:44.608Z","dateReserved":"2026-09-11T19:38:34.761Z","dateUpdated":"2026-09-11T19:46:44.608Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-11 20:20:04","lastModifiedDate":"2026-09-11 20:20:04","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"89736","Ordinal":"1","Title":"usb: gadget: u_audio: Fix use-after-free on sound card disconnec","CVE":"CVE-2026-89736","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"89736","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"usb: gadget: u_audio: Fix use-after-free on sound card disconnec"}]}}}