CVE-2026-89736

CVE CVE-2026-89736EUVD EUVD-2026-76648Published 2026-09-11T19:46:44.000ZLast changed 2026-09-14T12:02:23.000ZCVSS 7.8

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 6.12.109; 3e016ef2e72da93a2ea7afbb45de1b481b44d761; b131989797f7287d7fdadb2bababc05a15d44750 <f983793f03148b097977f200298db215cd2d4438; 6c67ed9ad9b83e453e808f9b31a931a20a25629b <4e747c864a88537e18b1ffc19a1954c9686bb8e1; 0eda2004f38d95ef5715d62be884cd344260535b; patch: 7.2.4; patch: 5.15.221; 4.19.280 <4.20; 3256e152b645fc1e788ba44c2d8ced690113e3e6; 6.2.9 <6.3; 4.14.312 <4.15; 43ca70753dfffd517d2af126da28690f8f615605; 3bc7324e4911351e39c54a62e6ca46321cb10faf <6f46762196f04464e1050a9ee94e72b917db9010; patch: 0; patch: 6.1.188; 5.15.105 <5.15.221; patch: 7.3-rc1; 6c67ed9ad9b83e453e808f9b31a931a20a25629b <891a8d11f4d5eb50b2ce7570f4f98204a7a57493; patch: 6.18.50; 6c67ed9ad9b83e453e808f9b31a931a20a25629b <858965947081d10d41d9a1010a540d3d5eea958b; 6.1.22 <6.1.188; 6c67ed9ad9b83e453e808f9b31a931a20a25629b <79a92896e2bb9471550c56fc23d8d93592f04c27; 6.3; patch: 6.6.157; 5.10.177 <5.10.270; 5.4.240 <5.5; 6c67ed9ad9b83e453e808f9b31a931a20a25629b <c74ff0b1a0fca53d3ac185873c87d6a719b30a47; 33f341c1fc60e172a3515c51bdabee11e83d1ee9 <a7ecd1a04f4f485d7be6443d0f0b2c61a800cb82; patch: 5.10.270

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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