5.5

CVE-2025-21745: linux

CVSS: 5.5v3.1MediumModified
AliasesUBUNTU-CVE-2025-21745DEBIAN-CVE-2025-21745
Published 27-02-2025Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2025-21745 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.27% chance of exploitation in the next 30 days, higher than 17.5% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.27%
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 36 · Related 34
DLA-4102-1DLA-4178-1RHSA-2025:20518SUSE-SU-2025:01919-1SUSE-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: blk-cgroup: Fix class @block_class's subsystem refcount leakage blkcg_fill_root_iostats() iterates over @block_class's devices by class_dev_iter_(init|next)(), but does not end iterating with class_dev_iter_exit(), so causes the class's subsystem refcount leakage. Fix by ending the iterating with class_dev_iter_exit().

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.27%

Chance of exploitation in the next 30 days

Percentile

18%

Versus all other CVEs

30-day change

+0.01 pp

From 0.25% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.27%

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

Ubuntu124 products
  • linux< 5.15.0-140.150 | < 6.8.0-64.67
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1084.91 | < 6.8.0-1032.34
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ ef45fe470e1e5410db4af87abc5d5055427945ac, < ffb494f1e7a047bd7a41b13796fcfb08fe5beafb | ≥ ef45fe470e1e5410db4af87abc5d5055427945ac, < 38287f779b34dfe959b4b681e909f2d3d52b88be | ≥ ef45fe470e1e5410db4af87abc5d5055427945ac, < 431b6ef2714be4d5babb802114987541a88b43b0 | ≥ ef45fe470e1e5410db4af87abc5d5055427945ac, < 993121481b5a87829f1e8163f47158b72679f309 | ≥ ef45fe470e1e5410db4af87abc5d5055427945ac, < 2ce09aabe009453d641a2ceb79e6461a2d4f3876 | ≥ ef45fe470e1e5410db4af87abc5d5055427945ac, < 67c7f213e052b1aa6caba4a7e25e303bc6997126 | ≥ ef45fe470e1e5410db4af87abc5d5055427945ac, < d1248436cbef1f924c04255367ff4845ccd9025e | 5.9
  • linux_kernel≥ 5.9, < 6.1.129 | ≥ 6.2, < 6.6.78 | ≥ 6.7, < 6.12.14 | ≥ 6.13, < 6.13.3
Debian1 product
  • linux< 6.1.129-1 | < 6.12.15-1

3 vendors · 127 products

References

45 links
Show all 45 references