Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 33f341c1fc60e172a3515c51bdabee11e83d1ee9 before a7ecd1a04f4f485d7be6443d0f0b2c61a800cb82; affected b131989797f7287d7fdadb2bababc05a15d44750 before f983793f03148b097977f200298db215cd2d4438; affected 3bc7324e4911351e39c54a62e6ca46321cb10faf before 6f46762196f04464e1050a9ee94e72b917db9010; affected 6c67ed9ad9b83e453e808f9b31a931a20a25629b before 891a8d11f4d5eb50b2ce7570f4f98204a7a57493; affected 6c67ed9ad9b83e453e808f9b31a931a20a25629b before c74ff0b1a0fca53d3ac185873c87d6a719b30a47; affected 6c67ed9ad9b83e453e808f9b31a931a20a25629b before 4e747c864a88537e18b1ffc19a1954c9686bb8e1; affected 6c67ed9ad9b83e453e808f9b31a931a20a25629b before 79a92896e2bb9471550c56fc23d8d93592f04c27; affected 6c67ed9ad9b83e453e808f9b31a931a20a25629b before 858965947081d10d41d9a1010a540d3d5eea958b; affected 3e016ef2e72da93a2ea7afbb45de1b481b44d761; affected 3256e152b645fc1e788ba44c2d8ced690113e3e6; affected 0eda2004f38d95ef5715d62be884cd344260535b; affected 43ca70753dfffd517d2af126da28690f8f615605; affected 5.10.177 before 5.10.270; affected 5.15.105 before 5.15.221; affected 6.1.22 before 6.1.188; affected 4.14.312 before 4.15; affected 4.19.280 before 4.20; affected 5.4.240 before 5.5; affected 6.2.9 before 6.3 |
| Linux / Linux | affected 6.3; unaffected 0 before 6.3; unaffected 5.10.270 through 5.10.*; unaffected 5.15.221 through 5.15.*; unaffected 6.1.188 through 6.1.*; unaffected 6.6.157 through 6.6.*; unaffected 6.12.109 through 6.12.*; unaffected 6.18.50 through 6.18.*; unaffected 7.2.4 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
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