Skip to content
CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-89736

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

Read JSON ↗CVE.org ↗
Status
Published
Published
Updated
Assigning organization
Linux

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 33f341c1fc60e172a3515c51bdabee11e83d1ee9 to < a7ecd1a04f4f485d7be6443d0f0b2c61a800cb82affected
  • b131989797f7287d7fdadb2bababc05a15d44750 to < f983793f03148b097977f200298db215cd2d4438affected
  • 3bc7324e4911351e39c54a62e6ca46321cb10faf to < 6f46762196f04464e1050a9ee94e72b917db9010affected
  • 6c67ed9ad9b83e453e808f9b31a931a20a25629b to < 891a8d11f4d5eb50b2ce7570f4f98204a7a57493affected
  • 6c67ed9ad9b83e453e808f9b31a931a20a25629b to < c74ff0b1a0fca53d3ac185873c87d6a719b30a47affected
  • 6c67ed9ad9b83e453e808f9b31a931a20a25629b to < 4e747c864a88537e18b1ffc19a1954c9686bb8e1affected
  • 6c67ed9ad9b83e453e808f9b31a931a20a25629b to < 79a92896e2bb9471550c56fc23d8d93592f04c27affected
  • 6c67ed9ad9b83e453e808f9b31a931a20a25629b to < 858965947081d10d41d9a1010a540d3d5eea958baffected
  • 3e016ef2e72da93a2ea7afbb45de1b481b44d761affected
  • 3256e152b645fc1e788ba44c2d8ced690113e3e6affected
  • 0eda2004f38d95ef5715d62be884cd344260535baffected
  • 43ca70753dfffd517d2af126da28690f8f615605affected
  • 5.10.177 to < 5.10.270affected
  • 5.15.105 to < 5.15.221affected
  • 6.1.22 to < 6.1.188affected
  • 4.14.312 to < 4.15affected
  • 4.19.280 to < 4.20affected
  • 5.4.240 to < 5.5affected
  • 6.2.9 to < 6.3affected

Linux Linux

Default version status: affected

  • 6.3affected
  • 0 to < 6.3unaffected
  • 5.10.270 to ≤ 5.10.*unaffected
  • 5.15.221 to ≤ 5.15.*unaffected
  • 6.1.188 to ≤ 6.1.*unaffected
  • 6.6.157 to ≤ 6.6.*unaffected
  • 6.12.109 to ≤ 6.12.*unaffected
  • 6.18.50 to ≤ 6.18.*unaffected
  • 7.2.4 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References