CVE-2026-74663: net/sched: reject overly deep qdisc hierarchies
CSIRTS triage
- What
- A denial of service vulnerability in the network scheduler (qdisc) that allows creation of excessively deep queue discipline hierarchies.
- Who is affected
- Systems running affected Linux kernel versions where unprivileged users can configure qdisc rules.
- Urgency
- Medium priority; not exploited but allows local denial of service through resource exhaustion.
- Action
- Apply Linux kernel patch rejecting overly deep qdisc hierarchies during configuration.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-74663
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-746630.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-74663 | coverage & exploitation status | NVD · CVE.org |
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