CVE-2026-46048
published 2026-05-27CVE-2026-46048: In the Linux kernel, the following vulnerability has been resolved: ALSA: caiaq: fix usb_dev refcount leak on probe failure create_card() takes a reference on…
medium5.5
In the Linux kernel, the following vulnerability has been resolved:
ALSA: caiaq: fix usb_dev refcount leak on probe failure
create_card() takes a reference on the USB device with usb_get_dev()
and stores the matching usb_put_dev() in card_free(), which is
installed as the snd_card's ->private_free destructor.
However, ->private_free is only assigned near the end of init_card(),
after several failure points (usb_set_interface(), EP type checks,
usb_submit_urb(), the EP1_CMD_GET_DEVICE_INFO exchange, and its
timeout). When any of those fail, init_card() returns an error to
snd_probe(), which calls snd_card_free(card). Because ->private_free
is still NULL, card_free() never runs, the usb_get_dev() reference
is not dropped, and the struct usb_device leaks along with its
descriptor allocations and device_private.
syzbot reproduces this with a malformed UAC3 device whose only valid
altsetting is 0; init_card()'s usb_set_interface(usb_dev, 0, 1) call
fails with -EIO and triggers the leak.
Move the ->private_free assignment into create_card(), immediately
after usb_get_dev(), so that every error path reaching snd_card_free()
balances the reference. card_free()'s callees (snd_usb_caiaq_input_free,
free_urbs, kfree) already tolerate the partially-initialized state
because the chip private area is zero-initialized by snd_card_new().
Affected
14 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | >= 1d9be95aee6c6246a21752e60c9519902649f482 < da3b8fd6a202d94fef11a443abc9171c52426a1c | da3b8fd6a202d94fef11a443abc9171c52426a1c |
| linux | linux | >= 493b3a682ededc804555755f5d2193201339612d < c874db8a1d2f9f08161470d00cfe8db2f5cca2cc | c874db8a1d2f9f08161470d00cfe8db2f5cca2cc |
| linux | linux | >= 59b622a043cffc58b7638cd85ae6c30a0904f8e6 < 21ca595aafa40d3ac70eab1f4cb62cc00ca21657 | 21ca595aafa40d3ac70eab1f4cb62cc00ca21657 |
| linux | linux | >= 6.12.84 < 6.12.86 | 6.12.86 |
| linux | linux | >= 6.18.25 < 6.18.27 | 6.18.27 |
| linux | linux | >= 6.6.136 < 6.6.140 | 6.6.140 |
| linux | linux | >= 6473ed16df1fe88051140611b3eb9a49be7f429e < 6153878c5255bb69b7d0868105ca078ef13cbcf8 | 6153878c5255bb69b7d0868105ca078ef13cbcf8 |
| linux | linux | >= 7.0.2 < 7.0.4 | 7.0.4 |
| linux | linux | >= 80bb50e2d459213cccff3111d5ef98ed4238c0d5 < 7a5f1cd22d47f8ca4b760b6334378ae42c1bd24b | 7a5f1cd22d47f8ca4b760b6334378ae42c1bd24b |
| linux | linux | >= ac7345f68cda6989016d85d63f7b244c064aa8f6 < a8d907acc3e5a078c2e5637ff60c30c6d2ddc23a | a8d907acc3e5a078c2e5637ff60c30c6d2ddc23a |
| linux | linux | >= dbcf7588e8dea017ddb3f18ec2766f7d2e5f2a0e < 6fa8dff64fb6c401ced40a05797b327659317498 | 6fa8dff64fb6c401ced40a05797b327659317498 |
| linux | linux | >= f6634af5de728a46792f674a66d7843570cb68f7 < 50c6a1f05973f56d23280c9d7645a7a5734e0907 | 50c6a1f05973f56d23280c9d7645a7a5734e0907 |
| linux | linux_kernel | — | — |