CVE-2022-50229
ALSA: bcd2000: Fix a UAF bug on the error path of probing
Vexday Risk Score
3Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS —EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —
Lifecycle
18 Jun 2025Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
In the Linux kernel, the following vulnerability has been resolved:
ALSA: bcd2000: Fix a UAF bug on the error path of probing
When the driver fails in snd_card_register() at probe time, it will free
the 'bcd2k->midi_out_urb' before killing it, which may cause a UAF bug.
The following log can reveal it:
[ 50.727020] BUG: KASAN: use-after-free in bcd2000_input_complete+0x1f1/0x2e0 [snd_bcd2000]
[ 50.727623] Read of size 8 at addr ffff88810fab0e88 by task swapper/4/0
[ 50.729530] Call Trace:
[ 50.732899] bcd2000_input_complete+0x1f1/0x2e0 [snd_bcd2000]
Fix this by adding usb_kill_urb() before usb_free_urb().
Affected products
Linux · LinuxReferences
https://git.kernel.org/stable/c/05e0bb8c3c4dde3e21b9c1cf9395afb04e8b24dbhttps://git.kernel.org/stable/c/1d6a246cf97c380f2da76591f03019dd9c9599c3https://git.kernel.org/stable/c/348620464a5c127399ac09b266f494f393661952https://git.kernel.org/stable/c/4fc41f7ebb7efca282f1740ea934d16f33c1d109https://git.kernel.org/stable/c/5e7338f4dd92b2f8915a82abfa1dd3ad3464bea0https://git.kernel.org/stable/c/64ca7f50ad96c2c65ae390b954925a36eabe04aahttps://git.kernel.org/stable/c/a718eba7e458e2f40531be3c6b6a0028ca7fcacehttps://git.kernel.org/stable/c/b0d4af0a4763ddc02344789ef2a281c494bc330dhttps://git.kernel.org/stable/c/ffb2759df7efbc00187bfd9d1072434a13a54139