CVE-2026-74663
High
Description
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.
SeverityHigh
CVSS7.8
Exploit probability—
Product
Linux
PublishedAug 22, 2026
First seenAug 22, 2026
How to fix
Update
- Linux Linux08dc49df1527b09d9ea225a7265bbf6c237097bf, a627d36c2a94e18c8c105ae68008786dfd85592e, 9f69bb9fdaa2fe64b68bb62fb84d405784bee540, 8ca8cdb74939581339e1ae370193c0adb5a85336, 2759acf08a3454866660edcd3ef4e64139f254a6, a4b14a4df29d36458a943f9b521ddd0f940363cc, e2d658c6427844cee5bc654b436ca68d680b6148, dedd34b0f2310e28c5f6d4875cfbf4b7ed821c01 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < 08dc49df1527b09d9ea225a7265bbf6c237097bf, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < a627d36c2a94e18c8c105ae68008786dfd85592e, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < 9f69bb9fdaa2fe64b68bb62fb84d405784bee540, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < 8ca8cdb74939581339e1ae370193c0adb5a85336, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < 2759acf08a3454866660edcd3ef4e64139f254a6, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < a4b14a4df29d36458a943f9b521ddd0f940363cc, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < e2d658c6427844cee5bc654b436ca68d680b6148, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ≤ v < dedd34b0f2310e28c5f6d4875cfbf4b7ed821c01, 2.6.12 | 08dc49df1527b09d9ea225a7265bbf6c237097bf, a627d36c2a94e18c8c105ae68008786dfd85592e, 9f69bb9fdaa2fe64b68bb62fb84d405784bee540, 8ca8cdb74939581339e1ae370193c0adb5a85336, 2759acf08a3454866660edcd3ef4e64139f254a6, a4b14a4df29d36458a943f9b521ddd0f940363cc, e2d658c6427844cee5bc654b436ca68d680b6148, dedd34b0f2310e28c5f6d4875cfbf4b7ed821c01 |
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