ALSA: usb-audio: Fix out of bounds reads when finding clock sources

Open Source Vulnerabilities ASB-A-382239029

In validate_clock_selector of clock.c, there is a possible out of bounds read due to memory corruption. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.

Open Source Vulnerabilities CVE-2024-53150

In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Fix out of bounds reads when finding clock sources The current USB-audio driver code doesn't check bLength of each descriptor at traversing for clock descriptors. That is, when a device provides a bogus descriptor with a shorter bLength, the driver might hit out-of-bounds reads. For addressing it, this patch adds sanity checks to the validator functions for the clock descriptor traversal. When the descriptor length is shorter than expected, it's skipped in the loop. For the clock source and clock multiplier descriptors, we can just check bLength against the sizeof() of each descriptor type. OTOH, the clock selector descriptor of UAC2 and UAC3 has an array of bNrInPins elements and two more fields at its tail, hence those have to be checked in addition to the sizeof() check.

Cybersecurity and Infrastructure Security Agency Known Exploited Vulnerabilities CVE-2024-53150

Linux Kernel contains an out-of-bounds read vulnerability in the USB-audio driver that allows a local, privileged attacker to obtain potentially sensitive information.