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CVE-2025-38468 is a Linux kernel net/sched flaw in Hierarchy Token Bucket (HTB) queueing discipline processing. During HTB dequeue processing, a netem child qdisc can enqueue a packet to a blackhole child qdisc. The blackhole qdisc drops the packet, causing backlog reduction and deactivation of the sole class in a selected HTB priority red-black tree. This leaves the tree empty. When dequeue processing subsequently calls htb_lookup_leaf for that same priority tree, the function reaches a BUG_ON assertion rather than handling the empty tree. The upstream correction makes htb_lookup_leaf return NULL for an empty tree, which is safely handled by htb_dequeue_tree.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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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.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.