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CVE-2025-38527 is a use-after-free vulnerability in the Linux kernel SMB/CIFS client’s cifs_oplock_break() path. During concurrent CIFS filesystem unmount and opportunistic-lock break processing, _cifsFileInfo_put() can release the final superblock reference. This initiates superblock teardown and RCU-mediated inode destruction, including freeing the cinode object, while cifs_oplock_break() still accesses that object for lock release and oplock-break completion. The fix retains an additional superblock reference for the entire oplock-break operation, preventing inode reclamation until processing finishes.
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19 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel SMB client vulnerability caused by a race condition in cifs_oplock_break() that can lead to a use-after-free of the cinode structure during unmount operations.
Use-after-free vulnerability in the Linux kernel CIFS/SMB client.
Linux kernel SMB/CIFS client use-after-free vulnerability in cifs_oplock_break.
A Linux kernel SMB client use-after-free flaw in cifs_oplock_break.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.