CVE-2026-89736usb: gadget: u_audio: Fix use-after-free on sound card disconnect
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 33f341c1fc60e172a3515c51bdabee11e83d1ee9 before a7ecd1a04f4f485d7be6443d0f0b2c61a800cb82; from b131989797f7287d7fdadb2bababc05a15d44750 before f983793f03148b097977f200298db215cd2d4438; from 3bc7324e4911351e39c54a62e6ca46321cb10faf before 6f46762196f04464e1050a9ee94e72b917db9010; from 6c67ed9ad9b83e453e808f9b31a931a20a25629b before 891a8d11f4d5eb50b2ce7570f4f98204a7a57493; from 6c67ed9ad9b83e453e808f9b31a931a20a25629b before c74ff0b1a0fca53d3ac185873c87d6a719b30a47; 6c67ed9ad9b83e453e808f9b31a931a20a25629b builds before 4e747c864a88537e18b1ffc19a1954c9686bb8e1; from 6c67ed9ad9b83e453e808f9b31a931a20a25629b before 79a92896e2bb9471550c56fc23d8d93592f04c27; from 6c67ed9ad9b83e453e808f9b31a931a20a25629b before 858965947081d10d41d9a1010a540d3d5eea958b; and 11 more ranges | CNA record |
References
- https://git.kernel.org/stable/c/a7ecd1a04f4f485d7be6443d0f0b2c61a800cb82
- https://git.kernel.org/stable/c/f983793f03148b097977f200298db215cd2d4438
- https://git.kernel.org/stable/c/6f46762196f04464e1050a9ee94e72b917db9010
- https://git.kernel.org/stable/c/891a8d11f4d5eb50b2ce7570f4f98204a7a57493
- https://git.kernel.org/stable/c/c74ff0b1a0fca53d3ac185873c87d6a719b30a47
- https://git.kernel.org/stable/c/4e747c864a88537e18b1ffc19a1954c9686bb8e1
- https://git.kernel.org/stable/c/79a92896e2bb9471550c56fc23d8d93592f04c27
- https://git.kernel.org/stable/c/858965947081d10d41d9a1010a540d3d5eea958b
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.