From this webpage screenshot, we can extract the following key information about the vulnerability: 1. Vulnerability Description: - Issue Description: During the merging of linked lists, if the current process is the last holder, the merged list may lead to undefined behavior (UAF). - Solution: A helper function is added to check whether is in the merge chain and whether the current process is the sole holder. 2. Fix Code: - Code Changes: In the file , new code is added to check whether is in the merge chain and to ensure the current process is the only holder. - Code Example: 3. Fix Scope: - File: - Lines: From to 4. Fix Author: - Author: Yu Kuai - Signed-off-by: Yu Kuai 5. Fix Link: - Link: Upstream commit 1ba0403ac6447f2d63914fb760c44a3b19c44eaf This information indicates that a vulnerability causing undefined behavior (UAF) during linked list merging has been fixed, with the fix ensuring safety by verifying whether is in the merge chain and whether the current process is the only holder.