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CVE-2023-4128 is a rejected CVE record and must not be used for vulnerability tracking. It was rejected as a duplicate of CVE-2023-4206, CVE-2023-4207, and CVE-2023-4208, which collectively cover use-after-free vulnerabilities in Linux kernel net/sched traffic-control classifiers including cls_fw, cls_u32, and cls_route.
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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.
38 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel net/sched classifier use-after-free vulnerability.
Linux kernel net/sched classifier use-after-free vulnerability.
Linux kernel net/sched classifier use-after-free vulnerability affecting cls_fw, cls_u32, and cls_route.
Linux kernel traffic-control classifier use-after-free 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.