CVE-2026-98837
Description
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.
How to fix
- Linux Linux7017c9dda1ebbab428a6fd29c841596b5c9c84d1, 8315ea07ebb2497531ff42dd640396f6f1d4a8f0, 1d5d194594ff616ad36a052bde739d1cf5855b95, df2787819bd137111b56b8631dd581b0cce7144d, 850810c12686f80cdf7530f4f21e0157d904f739, 84727facd8506140cd04f2b0a8b1c4ddeac41cea, 2e5a413cc2a489c9427ecd3d73ad764bfb0c7103, 0b7bd20f6379bc5e431fd74d866390f5b5b63f3c, 5.10.273, 5.15.224, 6.1.191, 6.6.160, 6.12.113, 6.18.56, 7.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | da938aa9fc7826901921dcea225948ab21a97e45 ≤ v < 7017c9dda1ebbab428a6fd29c841596b5c9c84d1, 09616e25f502080ba684fc7fcf959d1376ab756d ≤ v < 8315ea07ebb2497531ff42dd640396f6f1d4a8f0, b956e48371f2ff72b76be9a829800ecec963bd45 ≤ v < 1d5d194594ff616ad36a052bde739d1cf5855b95, f537e3ad69609f6924a4db6b4a7f6561f5288bdd ≤ v < df2787819bd137111b56b8631dd581b0cce7144d, 6251e3e256337a30160ef59ab1580dde4d1acd28 ≤ v < 850810c12686f80cdf7530f4f21e0157d904f739, e59ecd4ee3a450db6cb4e4ecaa3efdd593f80056 ≤ v < 84727facd8506140cd04f2b0a8b1c4ddeac41cea, 28abd224db4a49560b452115bca3672a20e45b2f ≤ v < 2e5a413cc2a489c9427ecd3d73ad764bfb0c7103, 28abd224db4a49560b452115bca3672a20e45b2f ≤ v < 0b7bd20f6379bc5e431fd74d866390f5b5b63f3c, 096dd8519cf2f768e9e14f224b627f7aaee1a9c5, 5.10.258 ≤ v < 5.10.273, 5.15.209 ≤ v < 5.15.224, 6.1.175 ≤ v < 6.1.191, 6.6.140 ≤ v < 6.6.160, 6.12.86 ≤ v < 6.12.113, 6.18.27 ≤ v < 6.18.56, 7.0.4 ≤ v < 7.1, 7.1 | 7017c9dda1ebbab428a6fd29c841596b5c9c84d1, 8315ea07ebb2497531ff42dd640396f6f1d4a8f0, 1d5d194594ff616ad36a052bde739d1cf5855b95, df2787819bd137111b56b8631dd581b0cce7144d, 850810c12686f80cdf7530f4f21e0157d904f739, 84727facd8506140cd04f2b0a8b1c4ddeac41cea, 2e5a413cc2a489c9427ecd3d73ad764bfb0c7103, 0b7bd20f6379bc5e431fd74d866390f5b5b63f3c, 5.10.273, 5.15.224, 6.1.191, 6.6.160, 6.12.113, 6.18.56, 7.1 |
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