Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: ALSA: caiaq: unregister the input device when probe fails setup_card() registers the input device, whose name and phys point into struct snd_usb_caiaqdev, and then goes on to snd_card_register() and snd_usb_caiaq_control_init(). If either fails, snd_probe() calls snd_card_free(), which frees the device state but leaves the input device registered: card_free() only clears the pointer, and the input device is unregistered from snd_disconnect() alone. Reading its "uevent" attribute afterwards dereferences freed memory: BUG: KASAN: slab-use-after-free in string+0x4a9/0x4f0 Read of size 1 at addr ffff8880208f5043 by task caiaq/4967 add_uevent_var+0x183/0x3a0 input_dev_uevent+0x162/0x900 dev_uevent+0x2f1/0x870 uevent_show+0x1ca/0x3a0 ... Unregister the input device on the probe error path, as snd_disconnect() does. snd_usb_caiaq_input_disconnect() is a no-op when no input device was registered. Reproduced with a raw-gadget Audio Kontrol 1 and a temporary hack that makes snd_usb_caiaq_control_init() fail.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected f537e3ad69609f6924a4db6b4a7f6561f5288bdd before df2787819bd137111b56b8631dd581b0cce7144d; affected 6251e3e256337a30160ef59ab1580dde4d1acd28 before 850810c12686f80cdf7530f4f21e0157d904f739; affected e59ecd4ee3a450db6cb4e4ecaa3efdd593f80056 before 84727facd8506140cd04f2b0a8b1c4ddeac41cea; affected 28abd224db4a49560b452115bca3672a20e45b2f before 2e5a413cc2a489c9427ecd3d73ad764bfb0c7103; affected 28abd224db4a49560b452115bca3672a20e45b2f before 0b7bd20f6379bc5e431fd74d866390f5b5b63f3c; affected da938aa9fc7826901921dcea225948ab21a97e45; affected 09616e25f502080ba684fc7fcf959d1376ab756d; affected b956e48371f2ff72b76be9a829800ecec963bd45; affected 096dd8519cf2f768e9e14f224b627f7aaee1a9c5; affected 6.6.140 before 6.6.160; affected 6.12.86 before 6.12.113; affected 6.18.27 before 6.18.56; affected 5.10.258 before 5.11; affected 5.15.209 before 5.16; affected 6.1.175 before 6.2; affected 7.0.4 before 7.1 |
| Linux / Linux | affected 7.1; unaffected 0 before 7.1; unaffected 6.6.160 through 6.6.*; unaffected 6.12.113 through 6.12.*; unaffected 6.18.56 through 6.18.*; unaffected 7.2.10 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/df2787819bd137111b56b8631dd581b0cce7144d
- https://git.kernel.org/stable/c/850810c12686f80cdf7530f4f21e0157d904f739
- https://git.kernel.org/stable/c/84727facd8506140cd04f2b0a8b1c4ddeac41cea
- https://git.kernel.org/stable/c/2e5a413cc2a489c9427ecd3d73ad764bfb0c7103
- https://git.kernel.org/stable/c/0b7bd20f6379bc5e431fd74d866390f5b5b63f3c