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CVE-2023-52881 is a flaw in the Linux kernel TCP implementation's ACK sequence validation. For new, including potentially spoofed, TCP flows, the implementation could accept ACK values within the RFC 5961 send-window range even when those ACKs acknowledged bytes never transmitted by the server. These “ghost ACKs” permit brute-forcing of a server-selected TCP send window. Associated side channels, including one involving TCP SYN cookies, can expose the server's TCP initial sequence number (ISN), enabling more reliable TCP connection spoofing.
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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.
22 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel TCP issue involving spoofed ghost ACKs and exposure of an initial sequence number.
Linux kernel TCP issue involving spoofed ghost ACKs and initial sequence-number disclosure.
Linux kernel TCP flaw involving spoofed ghost ACKs that can leak the initial sequence number.
A Linux kernel TCP flaw involving spoofed ghost ACKs and possible leakage of an initial sequence number.
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.