8.1

CVE-2025-21766: linux

CVSS: 8.1v3.1HighModified
AliasesUBUNTU-CVE-2025-21766DEBIAN-CVE-2025-21766
Published 27-02-2025Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2025-21766 is a high (CVSS 8.1) vulnerability in linux. EPSS estimates a 0.57% chance of exploitation in the next 30 days, higher than 46.3% 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
0.57%
0%100%
Low · +0.04 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 40 · Related 40
DLA-4102-1SUSE-SU-2025:01919-1SUSE-SU-2025:01951-1SUSE-SU-2025:01967-1SUSE-SU-2025:1177-1SUSE-SU-2025:1178-1

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: ipv4: use RCU protection in __ip_rt_update_pmtu() __ip_rt_update_pmtu() must use RCU protection to make sure the net structure it reads does not disappear.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.57%

Chance of exploitation in the next 30 days

Percentile

46%

Versus all other CVEs

30-day change

+0.04 pp

From 0.53% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.57%

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

Ubuntu136 products
  • linuxAll versions (No fix recorded) | < 5.15.0-140.150 | < 6.8.0-78.78
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1084.91 | < 6.8.0-1035.37
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 2fbc6e89b2f1403189e624cabaf73e189c5e50c6, < ce3c6165fce0f06305c806696882a3ad4b90e33f | ≥ 2fbc6e89b2f1403189e624cabaf73e189c5e50c6, < ea07480b23225942208f1b754fea1e7ec486d37e | ≥ 2fbc6e89b2f1403189e624cabaf73e189c5e50c6, < 9b1766d1ff5fe496aabe9fc5f4e34e53f35c11c4 | ≥ 2fbc6e89b2f1403189e624cabaf73e189c5e50c6, < 4583748b65dee4d61bd50a2214715b4237bc152a | ≥ 2fbc6e89b2f1403189e624cabaf73e189c5e50c6, < a39f61d212d822b3062d7f70fa0588e50e55664e | ≥ 2fbc6e89b2f1403189e624cabaf73e189c5e50c6, < 139512191bd06f1b496117c76372b2ce372c9a41 | f415c264176e6095e9dee823e09c5bdd0ee0d337 | 98776a365da509ad923083ae54b38ee521c52742 | 860e2cc78c697c95bc749abb20047239fa1722ea | 2b1be6c925cdf4638811765a9160796291494b89 | ≥ 4.14.200, < 4.15 | ≥ 4.19.148, < 4.20 | ≥ 5.4.68, < 5.5 | ≥ 5.8.12, < 5.9 | 5.9
  • linux_kernel≥ 4.14.200, < 4.15 | ≥ 4.19.148, < 4.20 | ≥ 5.4.68, < 5.5 | ≥ 5.8.12, < 5.9 | ≥ 5.9.1, < 5.15.179 | ≥ 5.16, < 6.1.129 | ≥ 6.2, < 6.6.79 | ≥ 6.7, < 6.12.16 | ≥ 6.13, < 6.13.4 | 5.9 | 5.9:rc7 | 5.9:rc8 | 6.14:rc1 | 6.14:rc2
Debian1 product
  • linux< 6.1.129-1 | < 6.12.16-1

3 vendors · 139 products

References

36 links
Show all 36 references