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CVE-2023-4207 is a use-after-free vulnerability in the Linux kernel's cls_fw network traffic-control classifier. When fw_change() updates an existing filter, it copies the entire tcf_result structure into the replacement filter. If the filter is bound to a class, the successful update calls tcf_unbind_filter() on the old filter, decrementing the class's filter_cnt despite the replacement filter retaining a reference. This permits deletion of the still-referenced class and creates a dangling reference. Exploitation can cause a system crash or potentially enable local privilege escalation.
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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.
29 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Vulnerability addressed by the AlmaLinux 9.2 TuxCare advisory.
A vulnerability included in the TuxCare AlmaLinux 9.2 kernel security update advisory.
Linux kernel net/sched 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.