CVE-2025-38453

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 6.16.0-rc4-syzkaller-00108-g17bbde2e1716

Description The Linux kernel contains a flaw in the io uring/msg ring subsystem related to the freeing of io kiocb requests. Specifically, the freeing of requests was not properly deferred for RCU (Read-Copy-Update), leading to a potential use-after-free condition detected by KASAN (Kernel Address Sanitizer). This issue arises because msg ring requests allocate and free memory independently, necessitating deferred freeing to ensure safety. The vulnerability was identified through syzbot testing.

Recommendations Update to Linux kernel version 6.16.0-rc4-syzkaller-00108-g17bbde2e1716 or a later version to address this issue.