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CVE-2022-43945 is a buffer-overflow vulnerability in the Linux kernel Network File System server daemon (NFSD) prior to Linux kernel versions 5.19.17 and 6.0.2. NFSD combines the receive and send buffers for an RPC into one page array while tracking pages held by an NFSD thread. An RPC-over-TCP client can append garbage data to an otherwise correctly formed RPC message, causing the send buffer to shrink. Vulnerable NFSD handling does not expect the resulting oversized request and writes beyond the allocated buffer space.
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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.
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.
17 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability addressed by the referenced CentOS 7 security advisory.
A Linux kernel nfsd buffer-overflow flaw triggered by an RPC message over TCP containing garbage data.
A Linux kernel nfsd buffer-overflow vulnerability triggered by RPC-over-TCP messages containing garbage data.
Linux kernel nfsd buffer-overflow flaw triggered by an RPC-over-TCP message containing garbage data.
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.