UBUNTU-CVE-2025-21664

In the Linux kernel, the following vulnerability has been resolved: dm thin: make getfirstthin use rcu-safe list first function The documentation in rculist.h explains the absence of listemptyrcu and cautions programmers against relying on a listempty - listfirst sequence in RCU safe code. This i...

CVE-2025-21664

CVE-2025-21664 affects the Linux kernel dm-thin component. Root cause: get_first_thin did a non-RCU-safe sequence (list_empty -> list_first) that could race with concurrent updates, risking dereferencing a stale/altered list head during process_deferred_bios flow and leading to a crash. Connec...