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CVE-2025-39819 is a reference-counting vulnerability in the Linux kernel SMB client function smb2_compound_op. When allocation of vars fails, the function returns -ENOMEM without dropping the required cfile reference. Existing callers do not release that reference on this error path, potentially leaking resources. The fix routes the allocation-failure path through an added out label to ensure reference cleanup, while bypassing inapplicable cleanup and replay logic.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
18 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel SMB reference-counting flaw in smb2_compound_op can leak resources when allocation of vars fails. The affected error path does not release the cfile reference. The fix adds an out label to ensure cleanup occurs. The reference assigns a CVSS v3 base score of 5.5, with local access, low privileges, and high availability impact.
A Linux kernel SMB filesystem flaw involving an inconsistent reference-count update.
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.