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CVE-2026-23074 is a use-after-free vulnerability in the Linux kernel net/sched traffic-control subsystem. The teql queueing discipline was permitted as a non-root qdisc despite being intended only for root use. In a hierarchy with QFQ as the root qdisc, a delayed netem class, and a teql class, teql can enqueue a packet without updating its parent-visible queue length. Because teql peek returns NULL, QFQ does not dequeue it and continues to observe a zero queue length. Changing the affected QFQ class lmax can free aggregate pointers without properly deactivating the class. When a delayed netem packet is rescheduled, the kernel accesses a dangling pointer, causing a use-after-free.
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No public exploit code observed for this vulnerability.
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36 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A high-severity local Linux kernel use-after-free vulnerability involving the teql traffic-control queueing discipline when it is used below the root qdisc. The issue can lead to dangling-pointer access in QFQ under a particular QFQ, netem, and teql setup.
A high-severity local Linux kernel use-after-free vulnerability in the net/sched traffic-control subsystem. It arises from failure to enforce teql as a root qdisc and can be triggered through a specific QFQ, netem, and teql queueing-discipline configuration.
A Linux kernel network-scheduling flaw addressed by restricting teql use to a root queuing discipline.
A high-impact locally exploitable vulnerability affecting Unity Linux/UOS Server systems. Exploitation requires local low-privileged access and can compromise confidentiality, integrity, and availability.
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.