7.8

CVE-2026-74663: linux

CVSS: 7.8v3.1HighReceived
AliasesUBUNTU-CVE-2026-74663DEBIAN-CVE-2026-74663
Published 22-08-2026Last modified 16-10-2026
Open JSON

Vulnerability summary

CVE-2026-74663 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.2% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.13%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 10 · Related 9
MGASA-2026-0506OPENSUSE-SU-2026:22091-1SUSE-SU-2026:24179-1SUSE-SU-2026:24181-1SUSE-SU-2026:24182-1SUSE-SU-2026:24184-1

Timeline

  1. 22-08-2026
    PublishedVulnerability first disclosed.
  2. 16-10-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.13%

Chance of exploitation in the next 30 days

Percentile

2%

Versus all other CVEs

30-day change

0.00 pp

From 0.13% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.13%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu169 products
  • linuxAll versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.1.187-1 | < 6.12.105-1 | < 7.1.9-1
  • linux-6.12< 6.12.107-1~deb12u1
Linux1 product
  • linux≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 08dc49df1527b09d9ea225a7265bbf6c237097bf | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < a627d36c2a94e18c8c105ae68008786dfd85592e | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 9f69bb9fdaa2fe64b68bb62fb84d405784bee540 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 8ca8cdb74939581339e1ae370193c0adb5a85336 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 2759acf08a3454866660edcd3ef4e64139f254a6 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < a4b14a4df29d36458a943f9b521ddd0f940363cc | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < e2d658c6427844cee5bc654b436ca68d680b6148 | ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < dedd34b0f2310e28c5f6d4875cfbf4b7ed821c01 | 2.6.12

3 vendors · 172 products

References

13 links
Show all 13 references