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CVE-2023-4207 is a use-after-free vulnerability in the Linux kernel net/sched cls_fw traffic-control classifier. When fw_change() updates an existing filter, it copies the complete tcf_result structure to the replacement filter. If the filter is bound to a class, the successful update path subsequently calls tcf_unbind_filter() on the old filter, decrementing the filter count of a class that remains referenced by the replacement filter. The class can then be deleted while still referenced, creating a use-after-free condition.
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What an attacker gets, and what they’ve been doing with it.
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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.
25 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 traffic-control classifier use-after-free vulnerability.
Linux kernel net/sched 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.