7.8

CVE-2026-23105: linux Improper Input Validation

CVSS: 7.8v3.1HighModified
AliasesUBUNTU-CVE-2026-23105DEBIAN-CVE-2026-23105
Published 04-02-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-23105 is a high (CVSS 7.8) Improper Input Validation vulnerability in linux. EPSS estimates a 0.14% chance of exploitation in the next 30 days, higher than 3% 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
0.14%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 48 · Related 39
DLA-4475-1DLA-4476-1DSA-6126-1DSA-6127-1LSN-0122-1MGASA-2026-0097

Timeline

  1. 04-02-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: net/sched: qfq: Use cl_is_active to determine whether class is active in qfq_rm_from_ag This is more of a preventive patch to make the code more consistent and to prevent possible exploits that employ child qlen manipulations on qfq. use cl_is_active instead of relying on the child qdisc's qlen to determine class activation.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.14%

Chance of exploitation in the next 30 days

Percentile

3%

Versus all other CVEs

30-day change

+0.02 pp

From 0.13% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.14%

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

Affected systems

Ubuntu156 products
  • linuxAll versions (No fix recorded) | < 5.15.0-176.186 | < 6.8.0-117.117
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1105.112 | < 6.8.0-1055.58
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 462dbc9101acd38e92eda93c0726857517a24bbd, < fac2c67bb2bb732eae4283e45fc338af7e08c254 | ≥ 462dbc9101acd38e92eda93c0726857517a24bbd, < b8c24cf5268fb3bfb8d16324c3dbb985f698c835 | ≥ 462dbc9101acd38e92eda93c0726857517a24bbd, < f27047abf7cac1b6f90c3ad60de21ef9f717c26d | ≥ 462dbc9101acd38e92eda93c0726857517a24bbd, < 93b8635974fb050c43d07e35e5edfe6e685ca28a | ≥ 462dbc9101acd38e92eda93c0726857517a24bbd, < abd9fc26ea577561a5ef6241a1b058755ffdad0c | ≥ 462dbc9101acd38e92eda93c0726857517a24bbd, < 77f1afd0bb4d5da95236f6114e6d0dfcde187ff6 | ≥ 462dbc9101acd38e92eda93c0726857517a24bbd, < d837fbee92453fbb829f950c8e7cf76207d73f33 | 3.8
  • linux_kernel≥ 3.8, < 5.10.249 | ≥ 5.11, < 5.15.199 | ≥ 5.16, < 6.1.162 | ≥ 6.2, < 6.6.122 | ≥ 6.7, < 6.12.68 | ≥ 6.13, < 6.18.8 | 6.19:rc1 | 6.19:rc2 | 6.19:rc3 | 6.19:rc4 | 6.19:rc5 | 6.19:rc6
Debian1 product
  • linux< 6.1.162-1 | < 6.12.69-1 | < 6.18.8-1

3 vendors · 159 products

References

40 links
Show all 40 references