The relibc implementation of pthread_rwlockattr_setpshared includes a flaw that allows an attacker to trigger a denial of service by supplying a specially crafted input. The error causes the function to abort or hang, resulting in unresponsive threads or the crashing of the application that relies on the read‑write lock attributes.

This vulnerability affects the relibc library used by Redox OS. The vulnerable commit is 61f42d; any installation that includes this version is potentially impacted. No broader vendor list is available.

The security rating is not publicly defined and the EPSS score is unavailable, meaning exploitation potential is uncertain. The vulnerability is present in userland code and is not listed in CISA's KEV catalog. To exploit it an attacker would need to supply crafted input to the pthread_rwlockattr_setpshared() call, which could be achieved by a local process with sufficient privileges or by an unauthenticated user if the application accepts external input.