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CVE-2026-74663

HIGHCVSS 7.8/10EPSS 0.13%

Last modified

CVE-2026-74663 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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. EPSS estimates a 0.13% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.13%

2.3th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 08dc49df1527b09d9ea225a7265bbf6c237097bf; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < a627d36c2a94e18c8c105ae68008786dfd85592e; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 9f69bb9fdaa2fe64b68bb62fb84d405784bee540; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 8ca8cdb74939581339e1ae370193c0adb5a85336; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 2759acf08a3454866660edcd3ef4e64139f254a6; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < a4b14a4df29d36458a943f9b521ddd0f940363cc; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < e2d658c6427844cee5bc654b436ca68d680b6148; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < dedd34b0f2310e28c5f6d4875cfbf4b7ed821c01
LinuxLinux2.6.12

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-74663?
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.
How severe is CVE-2026-74663?
CVE-2026-74663 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.13% probability of exploitation in the next 30 days.
How do I fix CVE-2026-74663?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST