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Vulnerability Change Records for CVE-2022-48702

Change History

New CVE Received by NIST 5/03/2024 12:15:08 PM

Action Type Old Value New Value
Added Description

In the Linux kernel, the following vulnerability has been resolved:

ALSA: emu10k1: Fix out of bounds access in snd_emu10k1_pcm_channel_alloc()

The voice allocator sometimes begins allocating from near the end of the
array and then wraps around, however snd_emu10k1_pcm_channel_alloc()
accesses the newly allocated voices as if it never wrapped around.

This results in out of bounds access if the first voice has a high enough
index so that first_voice + requested_voice_count > NUM_G (64).
The more voices are requested, the more likely it is for this to occur.

This was initially discovered using PipeWire, however it can be reproduced
by calling aplay multiple times with 16 channels:
aplay -r 48000 -D plughw:CARD=Live,DEV=3 -c 16 /dev/zero

UBSAN: array-index-out-of-bounds in sound/pci/emu10k1/emupcm.c:127:40
index 65 is out of range for type 'snd_emu10k1_voice [64]'
CPU: 1 PID: 31977 Comm: aplay Tainted: G        W IOE      6.0.0-rc2-emu10k1+ #7
Hardware name: ASUSTEK COMPUTER INC P5W DH Deluxe/P5W DH Deluxe, BIOS 3002    07/22/2010
Call Trace:
snd_emu10k1_playback_hw_params+0x3bc/0x420 [snd_emu10k1]
snd_pcm_hw_params+0x29f/0x600 [snd_pcm]
snd_pcm_common_ioctl+0x188/0x1410 [snd_pcm]
? exit_to_user_mode_prepare+0x35/0x170
? do_syscall_64+0x69/0x90
? syscall_exit_to_user_mode+0x26/0x50
? do_syscall_64+0x69/0x90
? exit_to_user_mode_prepare+0x35/0x170
snd_pcm_ioctl+0x27/0x40 [snd_pcm]
? do_syscall_64+0x69/0x90
? do_syscall_64+0x69/0x90
Added Reference

kernel.org https://git.kernel.org/stable/c/39a90720f3abe96625d1224e7a7463410875de4c [No types assigned]
Added Reference

kernel.org https://git.kernel.org/stable/c/4204a01ffce97cae1d59edc5848f02be5b2b9178 [No types assigned]
Added Reference

kernel.org https://git.kernel.org/stable/c/45321a7d02b7cf9b3f97e3987fc1e4d649b82da2 [No types assigned]
Added Reference

kernel.org https://git.kernel.org/stable/c/45814a53514e10a8014906c882e0d0d38df39cc1 [No types assigned]
Added Reference

kernel.org https://git.kernel.org/stable/c/637c5310acb48fffcc5657568db3f3e9bc719bfa [No types assigned]
Added Reference

kernel.org https://git.kernel.org/stable/c/6b0e260ac3cf289e38446552461caa65e6dab275 [No types assigned]
Added Reference

kernel.org https://git.kernel.org/stable/c/88aac6684cf8bc885cca15463cb4407e91f28ff7 [No types assigned]
Added Reference

kernel.org https://git.kernel.org/stable/c/d29f59051d3a07b81281b2df2b8c9dfe4716067f [No types assigned]