PT-2025-8857 · Linux+10 · Linux Kernel+10

Zijun Hu · Published 2025-01-05 · Updated 2026-04-20 · CVE-2025-21745

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A issue in the Linux kernel has been resolved, related to the blk-cgroup subsystem. The blkcg fill root iostats() function iterates over devices by class dev iter init() and class dev iter next(), but fails to properly end the iteration with class dev iter exit(), resulting in a subsystem refcount leakage.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Memory Leak

Weakness Enumeration

CWE-401

Related Identifiers

ALSA-2025:20518

ALT-PU-2025-12647

AZL-57902

BDU:2025-12047

CVE-2025-21745

DLA-4102-1

DLA-4178-1

INFSA-2025_20518

OESA-2025-1339

OESA-2025-1340

OPENSUSE-SU-2025_1177-1

OPENSUSE-SU-2025_1178-1

OPENSUSE-SU-2025_1180-1

RHSA-2025:20518

RHSA-2025_20518

SUSE-SU-2025:01919-1

SUSE-SU-2025:1177-1

SUSE-SU-2025:1178-1

SUSE-SU-2025:1180-1

SUSE-SU-2025:20190-1

SUSE-SU-2025:20192-1

SUSE-SU-2025:20260-1

SUSE-SU-2025:20270-1

SUSE-SU-2025_1177-1

SUSE-SU-2025_1178-1

SUSE-SU-2025_1180-1

USN-7510-1

USN-7510-2

USN-7510-3

USN-7510-4

USN-7510-5

USN-7510-6

USN-7510-7

USN-7510-8

USN-7511-1

USN-7511-2

USN-7511-3

USN-7512-1

USN-7521-1

USN-7521-2

USN-7521-3

USN-7593-1

USN-7602-1

USN-7651-1

USN-7651-2

USN-7651-3

USN-7651-4

USN-7651-5

USN-7651-6

USN-7652-1

USN-7653-1

USN-7737-1

Affected Products

Alt Linux

Almalinux

Astra Linux

Debian

Linuxmint

Linux Kernel

Red Hat

Red Os

Rocky Linux

Suse

Ubuntu

References · 1938

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21745.json · Exploit
• https://ubuntu.com/security/CVE-2025-21666 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-21674 · Vendor Advisory
• https://osv.dev/vulnerability/USN-7510-4 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2024-58056 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2024-58054 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-21726 · Security Note
• https://ubuntu.com/security/CVE-2025-21864 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-21739 · Vendor Advisory
• https://ubuntu.com/security/CVE-2024-57949 · Vendor Advisory
• https://ubuntu.com/security/CVE-2024-58080 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2024-58071 · Security Note
• https://ubuntu.com/security/notices/USN-7651-3 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-23138 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-21852 · Vendor Advisory