CVE-2025-21745

MEDIUM

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 v3.1 Score

5.5
MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Published: 2/27/2025Modified: 7/14/2026

Related Intelligence (1)

CRITICALAi

Siemens SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP

<p><a href="https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-209-04.json"><strong>View CSAF</strong></a></p> <h2>Summary</h2> <p><strong>Multiple vulnerabilities have been identified in the additional GNU/Linux subsystem of the firmware version V3.1.6 for the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP (incl. SIPLUS variant). Siemens is preparing fix versions and recommend

CVE-2021-41617CVE-2023-28531
CISA Advisories

References (12)

https://git.kernel.org/stable/c/2ce09aabe009453d641a2ceb79e6461a2d4f3876Patchhttps://git.kernel.org/stable/c/38287f779b34dfe959b4b681e909f2d3d52b88behttps://git.kernel.org/stable/c/431b6ef2714be4d5babb802114987541a88b43b0Patchhttps://git.kernel.org/stable/c/67c7f213e052b1aa6caba4a7e25e303bc6997126Patchhttps://git.kernel.org/stable/c/993121481b5a87829f1e8163f47158b72679f309Patchhttps://git.kernel.org/stable/c/d1248436cbef1f924c04255367ff4845ccd9025ePatchhttps://git.kernel.org/stable/c/ffb494f1e7a047bd7a41b13796fcfb08fe5beafbhttps://lists.debian.org/debian-lts-announce/2025/03/msg00028.htmlhttps://lists.debian.org/debian-lts-announce/2025/05/msg00030.htmlhttps://cert-portal.siemens.com/productcert/html/ssa-019113.htmlhttps://cert-portal.siemens.com/productcert/html/ssa-082556.htmlhttps://cert-portal.siemens.com/productcert/html/ssa-265688.html