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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-98837

ALSA: caiaq: unregister the input device when probe fails

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Status
Published
Published
Updated
Assigning organization
Linux

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • da938aa9fc7826901921dcea225948ab21a97e45 to < 7017c9dda1ebbab428a6fd29c841596b5c9c84d1affected
  • 09616e25f502080ba684fc7fcf959d1376ab756d to < 8315ea07ebb2497531ff42dd640396f6f1d4a8f0affected
  • b956e48371f2ff72b76be9a829800ecec963bd45 to < 1d5d194594ff616ad36a052bde739d1cf5855b95affected
  • f537e3ad69609f6924a4db6b4a7f6561f5288bdd to < df2787819bd137111b56b8631dd581b0cce7144daffected
  • 6251e3e256337a30160ef59ab1580dde4d1acd28 to < 850810c12686f80cdf7530f4f21e0157d904f739affected
  • e59ecd4ee3a450db6cb4e4ecaa3efdd593f80056 to < 84727facd8506140cd04f2b0a8b1c4ddeac41ceaaffected
  • 28abd224db4a49560b452115bca3672a20e45b2f to < 2e5a413cc2a489c9427ecd3d73ad764bfb0c7103affected
  • 28abd224db4a49560b452115bca3672a20e45b2f to < 0b7bd20f6379bc5e431fd74d866390f5b5b63f3caffected
  • 096dd8519cf2f768e9e14f224b627f7aaee1a9c5affected
  • 5.10.258 to < 5.10.273affected
  • 5.15.209 to < 5.15.224affected
  • 6.1.175 to < 6.1.191affected
  • 6.6.140 to < 6.6.160affected
  • 6.12.86 to < 6.12.113affected
  • 6.18.27 to < 6.18.56affected
  • 7.0.4 to < 7.1affected

Linux Linux

Default version status: affected

  • 7.1affected
  • 0 to < 7.1unaffected
  • 5.10.273 to ≤ 5.10.*unaffected
  • 5.15.224 to ≤ 5.15.*unaffected
  • 6.1.191 to ≤ 6.1.*unaffected
  • 6.6.160 to ≤ 6.6.*unaffected
  • 6.12.113 to ≤ 6.12.*unaffected
  • 6.18.56 to ≤ 6.18.*unaffected
  • 7.2.10 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References