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CVE-2025-21647 is an underflow flaw in the Linux kernel CAKE traffic-control scheduler (sch_cake), affecting per-host bulk-flow fairness counters. An underflow of these counters can cause an out-of-bounds memory access. The corrective change centralizes counter accesses in helper functions that bounds-check counter increments and decrements, and moves flow-mode checks into those helpers.
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No public exploit code observed for this vulnerability.
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Bounds-checking flaw in Linux kernel sch_cake scheduler fairness counts.
A Linux kernel vulnerability in sched/sch_cake related to missing bounds checks on host bulk flow fairness counts.
Linux kernel CAKE scheduler bounds-checking vulnerability.
Linux kernel sch_cake bounds-checking flaw.
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.