8.1

CVE-2025-21765: linux

CVSS: 8.1v3.1HighModified
AliasesUBUNTU-CVE-2025-21765DEBIAN-CVE-2025-21765
Published 27-02-2025Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2025-21765 is a high (CVSS 8.1) vulnerability in linux. EPSS estimates a 0.61% chance of exploitation in the next 30 days, higher than 48.3% of scored vulnerabilities.

Overall risk
33/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.1/10
010
High · v3.1 (CVE.org)
EPSS score
0.61%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 59 · Related 56
DLA-4102-1DLA-4178-1RHSA-2025:20095RHSA-2025:20518SUSE-SU-2025:01919-1SUSE-SU-2025:01951-1

Timeline

  1. 27-02-2025
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ipv6: use RCU protection in ip6_default_advmss() ip6_default_advmss() needs rcu protection to make sure the net structure it reads does not disappear.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.61%

Chance of exploitation in the next 30 days

Percentile

48%

Versus all other CVEs

30-day change

+0.01 pp

From 0.60% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.61%

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

Ubuntu137 products
  • linuxAll versions (No fix recorded) | < 5.4.0-216.236 | < 5.15.0-140.150 | < 6.8.0-78.78
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.4.0-1146.156 | < 5.15.0-1084.91 | < 6.8.0-1035.37
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 5578689a4e3c04f2d43ea39736fd3fa396d80c6e, < 78ad057472d8c76e0602402269222f9f9c698790 | ≥ 5578689a4e3c04f2d43ea39736fd3fa396d80c6e, < d02f30d220ef9511568a48dba8a9004c65f8d904 | ≥ 5578689a4e3c04f2d43ea39736fd3fa396d80c6e, < 28de355b63ad42309ed5a03ee7c436c90512265b | ≥ 5578689a4e3c04f2d43ea39736fd3fa396d80c6e, < 84212387caadb211cd9dadd6fd5563bd37dc1f5e | ≥ 5578689a4e3c04f2d43ea39736fd3fa396d80c6e, < 4176a68b0db8fc74ac14fcd00ba8231371051dc2 | ≥ 5578689a4e3c04f2d43ea39736fd3fa396d80c6e, < 713a40c892f40300d63691d9f85b2a23b48fe1e8 | ≥ 5578689a4e3c04f2d43ea39736fd3fa396d80c6e, < 550ed693f47370502a71b85382e7f9e6417300b8 | ≥ 5578689a4e3c04f2d43ea39736fd3fa396d80c6e, < 3c8ffcd248da34fc41e52a46e51505900115fc2a | 2.6.26
  • linux_kernel≥ 2.6.26, < 5.4.291 | ≥ 5.5, < 5.10.235 | ≥ 5.11, < 5.15.179 | ≥ 5.16, < 6.1.129 | ≥ 6.2, < 6.6.79 | ≥ 6.7, < 6.12.16 | ≥ 6.13, < 6.13.4 | 6.14:rc1 | 6.14:rc2
Debian1 product
  • linux< 6.1.129-1 | < 6.12.16-1

3 vendors · 140 products

References

58 links
Show all 58 references