CVE-2022-49755

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A race condition exists in the Linux kernel during fast composition switch, potentially allowing a use-after-free scenario. This occurs when ffs ep0 write or ffs ep0 read calls ffs ep0 queue wait and takes a lock on &ffs->ev.waitq.lock, but functionfs unbind can still free ep0req without a NULL check in ffs ep0 queue wait. The issue is resolved by introducing a mutex lock to serialize execution between the two functions.

Recommendations To resolve this issue, apply the fix that introduces a mutex lock using mutex lock(ffs->mutex) to prevent the race condition between ffs ep0 write/ffs ep0 read and functionfs unbind. At the moment, there is no information about a newer version that contains a fix for this vulnerability.