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CVE-2023-52581 is a resource-management vulnerability in the Linux kernel Netfilter nf_tables subsystem. During garbage collection of expired set elements, the transaction garbage-collection container type used an 8-bit value. When more than 255 elements expired, the value wrapped before the boundary check, causing the space check to continue succeeding. nf_tables then reused the initial garbage-collection container and lost references to elements processed earlier, leaking their memory. The upstream correction switches containers at the intended boundary and avoids dereferencing the garbage-collection object after passing it to deferred RCU cleanup.
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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.
12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel nf_tables memory-leak vulnerability.
Linux kernel nftables memory leak when more than 255 elements expire.
Linux kernel nftables memory-leak vulnerability.
Linux kernel Netfilter nftables memory-leak vulnerability.
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.