346 lines
18 KiB
JSON
346 lines
18 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-89736",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-11T19:38:34.761Z",
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"datePublished": "2026-09-11T19:46:44.608Z",
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"dateUpdated": "2026-10-19T08:51:50.340Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-19T08:51:50.340Z"
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},
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"descriptions": [
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{
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"lang": "en",
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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->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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The UAF is reached from local userspace: configfs UDC unbind calls afunc_unbind/f_audio_unbind → 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's 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->lock and write volume/mute/pitch into the kfree()'d 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->lock and USB ISO completions with req->context pointing into the freed object, reliably produces KASAN reports, oops, and kernel panic."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/usb/gadget/function/u_audio.c"
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],
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"versions": [
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{
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"version": "33f341c1fc60e172a3515c51bdabee11e83d1ee9",
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"lessThan": "a7ecd1a04f4f485d7be6443d0f0b2c61a800cb82",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "b131989797f7287d7fdadb2bababc05a15d44750",
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"lessThan": "f983793f03148b097977f200298db215cd2d4438",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "3bc7324e4911351e39c54a62e6ca46321cb10faf",
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"lessThan": "6f46762196f04464e1050a9ee94e72b917db9010",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "6c67ed9ad9b83e453e808f9b31a931a20a25629b",
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"lessThan": "891a8d11f4d5eb50b2ce7570f4f98204a7a57493",
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"status": "affected",
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},
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{
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"version": "6c67ed9ad9b83e453e808f9b31a931a20a25629b",
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"lessThan": "c74ff0b1a0fca53d3ac185873c87d6a719b30a47",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "6c67ed9ad9b83e453e808f9b31a931a20a25629b",
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"lessThan": "4e747c864a88537e18b1ffc19a1954c9686bb8e1",
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"status": "affected",
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},
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{
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"version": "6c67ed9ad9b83e453e808f9b31a931a20a25629b",
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"lessThan": "79a92896e2bb9471550c56fc23d8d93592f04c27",
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"status": "affected",
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},
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{
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"version": "6c67ed9ad9b83e453e808f9b31a931a20a25629b",
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"lessThan": "858965947081d10d41d9a1010a540d3d5eea958b",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "3e016ef2e72da93a2ea7afbb45de1b481b44d761",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "3256e152b645fc1e788ba44c2d8ced690113e3e6",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "0eda2004f38d95ef5715d62be884cd344260535b",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "43ca70753dfffd517d2af126da28690f8f615605",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "5.10.177",
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"lessThan": "5.10.270",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "5.15.105",
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"lessThan": "5.15.221",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.1.22",
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"lessThan": "6.1.188",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "4.14.312",
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"lessThan": "4.15",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "4.19.280",
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"lessThan": "4.20",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "5.4.240",
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"lessThan": "5.5",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.2.9",
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"lessThan": "6.3",
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"status": "affected",
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"versionType": "semver"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/usb/gadget/function/u_audio.c"
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],
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"versions": [
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{
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"version": "6.3",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.3",
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"status": "unaffected",
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},
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{
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"version": "5.10.270",
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"lessThanOrEqual": "5.10.*",
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},
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{
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},
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{
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"version": "6.1.188",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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{
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"version": "6.6.157",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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},
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{
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"version": "6.12.109",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.50",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.4",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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"nodes": [
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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},
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/a7ecd1a04f4f485d7be6443d0f0b2c61a800cb82"
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},
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{
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"url": "https://git.kernel.org/stable/c/f983793f03148b097977f200298db215cd2d4438"
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},
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{
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"url": "https://git.kernel.org/stable/c/6f46762196f04464e1050a9ee94e72b917db9010"
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},
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{
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"url": "https://git.kernel.org/stable/c/891a8d11f4d5eb50b2ce7570f4f98204a7a57493"
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},
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{
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"url": "https://git.kernel.org/stable/c/c74ff0b1a0fca53d3ac185873c87d6a719b30a47"
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},
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{
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"url": "https://git.kernel.org/stable/c/4e747c864a88537e18b1ffc19a1954c9686bb8e1"
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},
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{
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"url": "https://git.kernel.org/stable/c/79a92896e2bb9471550c56fc23d8d93592f04c27"
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},
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{
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"url": "https://git.kernel.org/stable/c/858965947081d10d41d9a1010a540d3d5eea958b"
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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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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |