CVE-2026-98837None▾ SunlitIn 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 goe…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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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.
Linux >= 6251e3e256337a30160ef59ab1580dde4d1acd28 < 850810c12686f80cdf7530f4f21e0157d904f739Linux >= e59ecd4ee3a450db6cb4e4ecaa3efdd593f80056 < 84727facd8506140cd04f2b0a8b1c4ddeac41ceaLinux >= 28abd224db4a49560b452115bca3672a20e45b2f < 2e5a413cc2a489c9427ecd3d73ad764bfb0c7103Linux >= 28abd224db4a49560b452115bca3672a20e45b2f < 0b7bd20f6379bc5e431fd74d866390f5b5b63f3cLinux da938aa9fc7826901921dcea225948ab21a97e45Linux 09616e25f502080ba684fc7fcf959d1376ab756dLinux b956e48371f2ff72b76be9a829800ecec963bd45Linux f537e3ad69609f6924a4db6b4a7f6561f5288bddLinux 096dd8519cf2f768e9e14f224b627f7aaee1a9c5Linux >= 6.12.86 < 6.12.113Linux >= 6.18.27 < 6.18.56Linux >= 5.10.258 < 5.11Linux >= 5.15.209 < 5.16Linux >= 6.1.175 < 6.2Linux >= 6.6.140 < 6.7Linux >= 7.0.4 < 7.1Linux 7.1Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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