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CVE-2026-89736

usb: gadget: u_audio: Fix use-after-free on sound card disconnect

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.270, 5.15.221, 6.1.188, 4.15, 4.20, and 6 more
None on Exploit-DB, Metasploit or GitHub

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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From 33f341c1fc60e172a3515c51bdabee11e83d1ee9 · fixed in a7ecd1a04f4f485d7be6443d0f0b2c61a800cb82; From b131989797f7287d7fdadb2bababc05a15d44750 · fixed in f983793f03148b097977f200298db215cd2d4438; From 3bc7324e4911351e39c54a62e6ca46321cb10faf · fixed in 6f46762196f04464e1050a9ee94e72b917db9010; From 6c67ed9ad9b83e453e808f9b31a931a20a25629b · fixed in 891a8d11f4d5eb50b2ce7570f4f98204a7a57493; From 6c67ed9ad9b83e453e808f9b31a931a20a25629b · fixed in c74ff0b1a0fca53d3ac185873c87d6a719b30a47; From 6c67ed9ad9b83e453e808f9b31a931a20a25629b · fixed in 4e747c864a88537e18b1ffc19a1954c9686bb8e1; From 6c67ed9ad9b83e453e808f9b31a931a20a25629b · fixed in 79a92896e2bb9471550c56fc23d8d93592f04c27; From 6c67ed9ad9b83e453e808f9b31a931a20a25629b · fixed in 858965947081d10d41d9a1010a540d3d5eea958b; From 5.10.177 · fixed in 5.10.270; From 5.15.105 · fixed in 5.15.221; From 6.1.22 · fixed in 6.1.188; From 4.14.312 · fixed in 4.15; From 4.19.280 · fixed in 4.20; From 5.4.240 · fixed in 5.5; From 6.2.9 · fixed in 6.3

  • Linux Linux

    6.3

  • KernelLinux

    fixed in 5.10.270; From 5.11.0 · fixed in 5.15.221; From 5.16.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.3.0 · fixed in 6.12.109; From 6.7.0 · fixed in 6.18.50; From 6.13.0 · fixed in 7.2.4

References 8

git.kernel.org