Loading vulnerability…
CVE-2025-38477 is a race condition in the Linux kernel Quick Fair Queueing traffic-control scheduler (net/sched sch_qfq). qfq_change_agg(), which can run during qfq_enqueue(), may modify a qfq_aggregate while concurrent class-management or statistics-dump paths access that aggregate without adequate synchronization. The race can produce a NULL-pointer dereference in qfq_dump_class() or a use-after-free in qfq_delete_class(). The upstream correction moves qfq_destroy_class() into the applicable critical section and protects qfq_dump_class() and qfq_dump_class_stats() with sch_tree_lock.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
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.
26 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Race condition in Linux kernel QFQ network scheduler.
Linux kernel QFQ network scheduler race condition involving qfq_aggregate.
A race-condition vulnerability in the Linux kernel network scheduler's sch_qfq qfq_aggregate handling, fixed by the Red Hat kernel-rt security update.
A race condition in the Linux kernel net/sched sch_qfq scheduler’s qfq_aggregate handling, fixed in the RHEL 7 Extended Lifecycle Support kernel update.
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.