Loading vulnerability…
CVE-2025-40320 is a use-after-free vulnerability in the Linux kernel SMB client implementation, specifically in smb2_query_info_compound() in the cifs subsystem. During a retry or replay path, a previously allocated cfid object may be freed during the first attempt, but the cfid pointer is not reset before the operation is replayed. Subsequent cleanup can then operate on the stale pointer, creating a potential use-after-free condition. The issue manifests as refcount underflow and kernel warnings and can be reached through SMB query information and filesystem query operations. The upstream fix reinitializes cfid to NULL under the replay label so later cleanup does not dereference or release a freed object.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.