CVE-2026-74663
N/AIn the Linux kernel, the following vulnerability has been resolved: net/sched: reject overly deep qdisc hierarchies Deep qdisc hierarchies can lead to excessive recursion in qdisc tree walkers and exhaust the kernel stack. The existing loop check does not cover the create-and-graft path, so a hierarchy can still be extended by creating a new child qdisc below an already deep parent. Store the hierarchy depth in struct Qdisc and update it when qdiscs are grafted. Reject new child qdiscs once the parent is already at the maximum allowed depth.
No known exploitation, public exploit, or elevated probability at this time. Track for changes.
Exploitation likelihood
—EPSS not yet scored
Impact if exploited
—CVSS · not scored
- No impact metrics
Proof of concept & exploit code
- github-search Search GitHub for public PoC repos
Test against your own equipment
curl -s https://vulnpedia.com/cve/CVE-2026-74663/poc.jsonMachine-readable PoC index for this CVE (for automation).Listed for defensive triage, patch verification, and authorized testing on systems you own. Machine-readable: /cve/CVE-2026-74663/poc.json
References
Technical & other
- https://git.kernel.org/stable/c/9f69bb9fdaa2fe64b68bb62fb84d405784bee540
- https://git.kernel.org/stable/c/8ca8cdb74939581339e1ae370193c0adb5a85336
- https://git.kernel.org/stable/c/2759acf08a3454866660edcd3ef4e64139f254a6
- https://git.kernel.org/stable/c/a4b14a4df29d36458a943f9b521ddd0f940363cc
- https://git.kernel.org/stable/c/e2d658c6427844cee5bc654b436ca68d680b6148
- https://git.kernel.org/stable/c/dedd34b0f2310e28c5f6d4875cfbf4b7ed821c01