CVE-2024-35831 Information

Description

In the Linux kernel the following vulnerability has been resolved:

io_uring: Fix release of pinned pages when __io_uaddr_map fails

Looking at the error path of __io_uaddr_map if we fail after pinning the pages for any reasons ret will be set to -EINVAL and the error handler won’t properly release the pinned pages.

I didn’t manage to trigger it without forcing a failure but it can happen in real life when memory is heavily fragmented.

Reference

https://git.kernel.org/stable/c/0b6f39c175ba5f0ef72bdb3b9d2a06ad78621d62 https://git.kernel.org/stable/c/712e2c8415f55a4a4ddaa98a430b87f624109f69 https://git.kernel.org/stable/c/4d376d7ad62b6a8e8dfff56b559d9d275e5b9b3a https://git.kernel.org/stable/c/67d1189d1095d471ed7fa426c7e384a7140a5dd7