CVE-2026-89736High· 7.8▾ TwilightIn 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…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
— → 7
none → high
— → 7
none → high
— → 7.8
none → high
7.8 → 7
7 → 7.8
7.8 → 5.5
high → medium
0.2% → 0.2%
Last analysed / modified upstream
5.5 → 7.8
medium → high
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.
Linux >= 33f341c1fc60e172a3515c51bdabee11e83d1ee9 < a7ecd1a04f4f485d7be6443d0f0b2c61a800cb82Linux >= b131989797f7287d7fdadb2bababc05a15d44750 < f983793f03148b097977f200298db215cd2d4438Linux >= 3bc7324e4911351e39c54a62e6ca46321cb10faf < 6f46762196f04464e1050a9ee94e72b917db9010Linux >= 6c67ed9ad9b83e453e808f9b31a931a20a25629b < 891a8d11f4d5eb50b2ce7570f4f98204a7a57493Linux >= 6c67ed9ad9b83e453e808f9b31a931a20a25629b < c74ff0b1a0fca53d3ac185873c87d6a719b30a47Linux >= 6c67ed9ad9b83e453e808f9b31a931a20a25629b < 4e747c864a88537e18b1ffc19a1954c9686bb8e1Linux >= 6c67ed9ad9b83e453e808f9b31a931a20a25629b < 79a92896e2bb9471550c56fc23d8d93592f04c27Linux >= 6c67ed9ad9b83e453e808f9b31a931a20a25629b < 858965947081d10d41d9a1010a540d3d5eea958bLinux 3e016ef2e72da93a2ea7afbb45de1b481b44d761Linux 3256e152b645fc1e788ba44c2d8ced690113e3e6Linux 0eda2004f38d95ef5715d62be884cd344260535bLinux 43ca70753dfffd517d2af126da28690f8f615605Linux >= 5.10.177 < 5.10.270Linux >= 5.15.105 < 5.15.221Linux >= 6.1.22 < 6.1.188Linux >= 4.14.312 < 4.15Linux >= 4.19.280 < 4.20Linux >= 5.4.240 < 5.5Linux >= 6.2.9 < 6.3Linux 6.3Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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