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CVE-2026-89736 (GCVE-0-2026-89736)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:46 – Updated: 2026-09-14 12:02
VLAI
Title
usb: gadget: u_audio: Fix use-after-free on sound card disconnect
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: u_audio: Fix use-after-free on sound card disconnect g_audio_cleanup() invokes snd_card_free_when_closed() to initiate sound card teardown and immediately frees the underlying struct snd_uac_chip context. However, snd_card_free_when_closed() returns asynchronously while ALSA control elements (kctls) remain open in userspace. When userspace control applications access or close these open file descriptors, kctl callbacks attempt to dereference kctl->private_data pointing to &uac->c_prm or &uac->p_prm within the freed uac structure, resulting in a use-after-free (UAF) memory corruption. Fix this issue by deferring the destruction of struct snd_uac_chip until all references to the ALSA sound card are released. Register a custom card->private_free callback (u_audio_card_free) during g_audio_setup() that frees uac and its associated playback/capture request and ring buffers only when the sound card reference count drops to zero.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 33f341c1fc60e172a3515c51bdabee11e83d1ee9 , < a7ecd1a04f4f485d7be6443d0f0b2c61a800cb82 (git)
Affected: b131989797f7287d7fdadb2bababc05a15d44750 , < f983793f03148b097977f200298db215cd2d4438 (git)
Affected: 3bc7324e4911351e39c54a62e6ca46321cb10faf , < 6f46762196f04464e1050a9ee94e72b917db9010 (git)
Affected: 6c67ed9ad9b83e453e808f9b31a931a20a25629b , < 891a8d11f4d5eb50b2ce7570f4f98204a7a57493 (git)
Affected: 6c67ed9ad9b83e453e808f9b31a931a20a25629b , < c74ff0b1a0fca53d3ac185873c87d6a719b30a47 (git)
Affected: 6c67ed9ad9b83e453e808f9b31a931a20a25629b , < 4e747c864a88537e18b1ffc19a1954c9686bb8e1 (git)
Affected: 6c67ed9ad9b83e453e808f9b31a931a20a25629b , < 79a92896e2bb9471550c56fc23d8d93592f04c27 (git)
Affected: 6c67ed9ad9b83e453e808f9b31a931a20a25629b , < 858965947081d10d41d9a1010a540d3d5eea958b (git)
Affected: 3e016ef2e72da93a2ea7afbb45de1b481b44d761 (git)
Affected: 3256e152b645fc1e788ba44c2d8ced690113e3e6 (git)
Affected: 0eda2004f38d95ef5715d62be884cd344260535b (git)
Affected: 43ca70753dfffd517d2af126da28690f8f615605 (git)
Affected: 5.10.177 , < 5.10.270 (semver)
Affected: 5.15.105 , < 5.15.221 (semver)
Affected: 6.1.22 , < 6.1.188 (semver)
Affected: 4.14.312 , < 4.15 (semver)
Affected: 4.19.280 , < 4.20 (semver)
Affected: 5.4.240 , < 5.5 (semver)
Affected: 6.2.9 , < 6.3 (semver)
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Linux Linux Affected: 6.3
Unaffected: 0 , < 6.3 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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          "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-\u003eprivate_data\npointing to \u0026uac-\u003ec_prm or \u0026uac-\u003ep_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-\u003eprivate_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."
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              "value": "AV:L - The UAF is reached from local userspace: configfs UDC unbind calls afunc_unbind/f_audio_unbind \u2192 g_audio_cleanup, which frees snd_uac_chip while ALSA kctl/PCM fds still reference it; g_audio_setup runs at function bind with no USB host required, matching gadget teardown scores such as CVE-2024-38628.\nAC:L - The attacker controls both sides by issuing SNDRV_CTL_IOCTL_ELEM_READ/WRITE on the UAC mixer kctls while concurrently unbinding the gadget; snd_card_disconnect does not drain in-flight ioctls before g_audio_cleanup kfree()s the chip, so kctl get/put callbacks dereference freed uac_rtd_params and the race is freely retryable.\nPR:L - Android and embedded USB gadget HALs commonly delegate /sys/kernel/config/usb_gadget UDC writes to non-root service accounts, and the UAC gadget\u0027s ALSA control/PCM nodes are reachable by unprivileged local users; init-namespace root is not required once the gadget is deployed.\nUI:N - The attacker performs gadget unbind, holds ALSA fds, and issues mixer ioctls itself; no separate victim action such as plugging a cable or mounting a filesystem is required.\nS:U - The use-after-free corrupts kernel heap objects (snd_uac_chip and its playback/capture rings) within the same host kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Kctl get/info/tlv callbacks (u_audio_volume_get, u_audio_rate_get, u_audio_volume_tlv) read volume, rate, and TLV fields from the already-freed snd_uac_chip and copy them to userspace, yielding a use-after-free disclosure primitive that kernel scoring treats as High confidentiality.\nI:H - Kctl put callbacks (u_audio_volume_put, u_audio_mute_put, u_audio_pitch_put) take prm-\u003elock and write volume/mute/pitch into the kfree()\u0027d snd_uac_chip, providing a write-after-free primitive that can be turned into arbitrary write or control-flow hijack.\nA:H - Use of the freed snd_uac_chip, including spin_lock_irqsave on prm-\u003elock and USB ISO completions with req-\u003econtext pointing into the freed object, reliably produces KASAN reports, oops, and kernel panic."
            }
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      "providerMetadata": {
        "dateUpdated": "2026-09-14T12:02:23.539Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/f983793f03148b097977f200298db215cd2d4438"
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          "url": "https://git.kernel.org/stable/c/891a8d11f4d5eb50b2ce7570f4f98204a7a57493"
        },
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          "url": "https://git.kernel.org/stable/c/c74ff0b1a0fca53d3ac185873c87d6a719b30a47"
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        {
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        {
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      "title": "usb: gadget: u_audio: Fix use-after-free on sound card disconnect",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89736",
    "datePublished": "2026-09-11T19:46:44.608Z",
    "dateReserved": "2026-09-11T19:38:34.761Z",
    "dateUpdated": "2026-09-14T12:02:23.539Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2026-89736",
      "date": "2026-09-15",
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      "cve": "CVE-2026-89736",
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      "initial_release_date": "2026-09-13T01:02:14.000Z",
      "product_status:known_not_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "usb: gadget: u_audio: Fix use-after-free on sound card disconnect",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-89736.json",
      "version": "3"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-89736\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-11T20:20:04.077\",\"lastModified\":\"2026-09-14T13:19:22.700\",\"vulnStatus\":\"Received\",\"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-\u003eprivate_data\\npointing to \u0026uac-\u003ec_prm or \u0026uac-\u003ep_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-\u003eprivate_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\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/usb/gadget/function/u_audio.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"33f341c1fc60e172a3515c51bdabee11e83d1ee9\",\"lessThan\":\"a7ecd1a04f4f485d7be6443d0f0b2c61a800cb82\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"b131989797f7287d7fdadb2bababc05a15d44750\",\"lessThan\":\"f983793f03148b097977f200298db215cd2d4438\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3bc7324e4911351e39c54a62e6ca46321cb10faf\",\"lessThan\":\"6f46762196f04464e1050a9ee94e72b917db9010\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6c67ed9ad9b83e453e808f9b31a931a20a25629b\",\"lessThan\":\"891a8d11f4d5eb50b2ce7570f4f98204a7a57493\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6c67ed9ad9b83e453e808f9b31a931a20a25629b\",\"lessThan\":\"c74ff0b1a0fca53d3ac185873c87d6a719b30a47\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6c67ed9ad9b83e453e808f9b31a931a20a25629b\",\"lessThan\":\"4e747c864a88537e18b1ffc19a1954c9686bb8e1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6c67ed9ad9b83e453e808f9b31a931a20a25629b\",\"lessThan\":\"79a92896e2bb9471550c56fc23d8d93592f04c27\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6c67ed9ad9b83e453e808f9b31a931a20a25629b\",\"lessThan\":\"858965947081d10d41d9a1010a540d3d5eea958b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3e016ef2e72da93a2ea7afbb45de1b481b44d761\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3256e152b645fc1e788ba44c2d8ced690113e3e6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0eda2004f38d95ef5715d62be884cd344260535b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"43ca70753dfffd517d2af126da28690f8f615605\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.10.177\",\"lessThan\":\"5.10.270\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.15.105\",\"lessThan\":\"5.15.221\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.1.22\",\"lessThan\":\"6.1.188\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"4.14.312\",\"lessThan\":\"4.15\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"4.19.280\",\"lessThan\":\"4.20\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.4.240\",\"lessThan\":\"5.5\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.2.9\",\"lessThan\":\"6.3\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/usb/gadget/function/u_audio.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.3\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.3\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.270\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.221\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.188\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.157\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.109\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.50\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.4\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4e747c864a88537e18b1ffc19a1954c9686bb8e1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6f46762196f04464e1050a9ee94e72b917db9010\",\"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/891a8d11f4d5eb50b2ce7570f4f98204a7a57493\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a7ecd1a04f4f485d7be6443d0f0b2c61a800cb82\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c74ff0b1a0fca53d3ac185873c87d6a719b30a47\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f983793f03148b097977f200298db215cd2d4438\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-09-13T06:47:11+00:00",
      "cve": "CVE-2026-89736",
      "id": "CVE-2026-89736",
      "initial_release_date": "2026-09-11T19:46:44.608000+00:00",
      "product_status:known_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel USB audio gadget driver: Use-after-free leading to arbitrary code execution",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89736.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-12T16:22:35Z",
      "cve": "CVE-2026-89736",
      "id": "CVE-2026-89736",
      "initial_release_date": "2026-09-12T16:22:35Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89736",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89736.json",
      "version": "2"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.