CVE-2026-74663net/sched: reject overly deep qdisc hierarchies
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In 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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 08dc49df1527b09d9ea225a7265bbf6c237097bf; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before a627d36c2a94e18c8c105ae68008786dfd85592e; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 9f69bb9fdaa2fe64b68bb62fb84d405784bee540; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 8ca8cdb74939581339e1ae370193c0adb5a85336; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 2759acf08a3454866660edcd3ef4e64139f254a6; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before a4b14a4df29d36458a943f9b521ddd0f940363cc; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before e2d658c6427844cee5bc654b436ca68d680b6148; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before dedd34b0f2310e28c5f6d4875cfbf4b7ed821c01 | CNA record |
References
- https://git.kernel.org/stable/c/08dc49df1527b09d9ea225a7265bbf6c237097bf
- https://git.kernel.org/stable/c/a627d36c2a94e18c8c105ae68008786dfd85592e
- 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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.