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CVE-2025-37778 is a memory-safety flaw in the Linux kernel's ksmbd SMB server implementation, specifically in the Kerberos authentication path. In krb_authenticate, sess->user is freed but the pointer is not cleared to NULL. The code then calls ksmbd_krb5_authenticate to reinitialize sess->user, but that function can return without restoring the pointer. In that failure path, smb2_sess_setup later dereferences sess->user, resulting in access to freed memory. The issue is therefore a dangling-pointer/use-after-free condition in ksmbd session setup handling after Kerberos authentication processing.
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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.
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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.
16 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A previously known vulnerability in the Linux kernel ksmbd SMB server referenced as a benchmark for LLM-based bug-finding.
A CVE identifier mentioned in the discussion as part of an apparently incorrect or disputed AI-generated summary about a ksmbd use-after-free issue; the content does not substantiate it beyond that mention.
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.