{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89736", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.761Z", "datePublished": "2026-09-11T19:46:44.608Z", "dateUpdated": "2026-09-11T19:46:44.608Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-11T19:46:44.608Z"}, "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."}], "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/u_audio.c"], "versions": [{"version": "6c67ed9ad9b83e453e808f9b31a931a20a25629b", "lessThan": "c74ff0b1a0fca53d3ac185873c87d6a719b30a47", "status": "affected", "versionType": "git"}, {"version": "6c67ed9ad9b83e453e808f9b31a931a20a25629b", "lessThan": "4e747c864a88537e18b1ffc19a1954c9686bb8e1", "status": "affected", "versionType": "git"}, {"version": "6c67ed9ad9b83e453e808f9b31a931a20a25629b", "lessThan": "79a92896e2bb9471550c56fc23d8d93592f04c27", "status": "affected", "versionType": "git"}, {"version": "6c67ed9ad9b83e453e808f9b31a931a20a25629b", "lessThan": "858965947081d10d41d9a1010a540d3d5eea958b", "status": "affected", "versionType": "git"}, {"version": "3e016ef2e72da93a2ea7afbb45de1b481b44d761", "status": "affected", "versionType": "git"}, {"version": "3256e152b645fc1e788ba44c2d8ced690113e3e6", "status": "affected", "versionType": "git"}, {"version": "0eda2004f38d95ef5715d62be884cd344260535b", "status": "affected", "versionType": "git"}, {"version": "33f341c1fc60e172a3515c51bdabee11e83d1ee9", "status": "affected", "versionType": "git"}, {"version": "b131989797f7287d7fdadb2bababc05a15d44750", "status": "affected", "versionType": "git"}, {"version": "3bc7324e4911351e39c54a62e6ca46321cb10faf", "status": "affected", "versionType": "git"}, {"version": "43ca70753dfffd517d2af126da28690f8f615605", "status": "affected", "versionType": "git"}, {"version": "4.14.312", "lessThan": "4.15", "status": "affected", "versionType": "semver"}, {"version": "4.19.280", "lessThan": "4.20", "status": "affected", "versionType": "semver"}, {"version": "5.4.240", "lessThan": "5.5", "status": "affected", "versionType": "semver"}, {"version": "5.10.177", "lessThan": "5.11", "status": "affected", "versionType": "semver"}, {"version": "5.15.105", "lessThan": "5.16", "status": "affected", "versionType": "semver"}, {"version": "6.1.22", "lessThan": "6.2", "status": "affected", "versionType": "semver"}, {"version": "6.2.9", "lessThan": "6.3", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/usb/gadget/function/u_audio.c"], "versions": [{"version": "6.3", "status": "affected"}, {"version": "0", "lessThan": "6.3", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-rc1", "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": "6.3", "versionEndExcluding": "6.12.109"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "7.3-rc1"}, {"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"}]}]}], "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"}}}}

{}

{"affected": [{"affectedData": [{"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"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-89736", "lastModified": "2026-09-11T20:20:04.077", "metrics": {}, "published": "2026-09-11T20:20:04.077", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4e747c864a88537e18b1ffc19a1954c9686bb8e1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/79a92896e2bb9471550c56fc23d8d93592f04c27"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/858965947081d10d41d9a1010a540d3d5eea958b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c74ff0b1a0fca53d3ac185873c87d6a719b30a47"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel USB audio gadget driver: Use-after-free leading to arbitrary code execution", "id": "2532311", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532311"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's USB audio gadget driver (u_audio). This vulnerability occurs during sound card disconnection when Asynchronous Linux Sound Architecture (ALSA) control elements (kctls) remain open in userspace. A local attacker can exploit this timing issue by interacting with these kctls, leading to a use-after-free memory corruption. This could potentially result in arbitrary code execution or a denial of service."], "name": "CVE-2026-89736", "public_date": "2026-09-11T19:46:44Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89736\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89736\nhttps://git.kernel.org/stable/c/4e747c864a88537e18b1ffc19a1954c9686bb8e1\nhttps://git.kernel.org/stable/c/79a92896e2bb9471550c56fc23d8d93592f04c27\nhttps://git.kernel.org/stable/c/858965947081d10d41d9a1010a540d3d5eea958b\nhttps://git.kernel.org/stable/c/c74ff0b1a0fca53d3ac185873c87d6a719b30a47"], "threat_severity": "Important"}

{"created": "2026-09-12T05:30:08.270002+00:00", "updated": "2026-09-12T12:15:13.361358+00:00", "vendors": []}