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CVE-2025-39766 affects the Linux kernel traffic-scheduling subsystem and the interaction between the CAKE queueing discipline and Hierarchical Token Bucket (HTB) scheduler. When a low CAKE memlimit causes its buffer_limit to be exceeded, cake_enqueue can drop packets while incorrectly returning NET_XMIT_SUCCESS. This causes htb_enqueue to invoke htb_activate with an empty child queueing discipline, triggering a kernel WARNING because the child queue length is zero. The fix returns NET_XMIT_CN when buffer-limit enforcement drops packets from the same tin and flow; acknowledgment-filtering drops are distinguished from these congestion-related drops.
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17 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel network-scheduler vulnerability involving incorrect return values when CAKE drops packets because its buffer limit is exceeded. When used beneath an HTB scheduler, this can trigger a kernel warning by activating an empty child queue. The reference assigns a CVSS v3 base score of 7.8, with local access and low privileges required. Echo provides a fixed linux package version, 6.1.153-1.
Linux kernel net/sched vulnerability involving cake_enqueue behavior when past buffer_limit.
A Linux kernel vulnerability in net/sched related to cake_enqueue behavior when past buffer_limit.
A Linux kernel vulnerability in net/sched related to cake_enqueue handling when past buffer_limit.
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.