CVE-2025-21745blk-cgroup: Fix class @block_class's subsystem refcount leakage
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | from ef45fe470e1e5410db4af87abc5d5055427945ac before ffb494f1e7a047bd7a41b13796fcfb08fe5beafb; from ef45fe470e1e5410db4af87abc5d5055427945ac before 38287f779b34dfe959b4b681e909f2d3d52b88be; from ef45fe470e1e5410db4af87abc5d5055427945ac before 431b6ef2714be4d5babb802114987541a88b43b0; from ef45fe470e1e5410db4af87abc5d5055427945ac before 993121481b5a87829f1e8163f47158b72679f309; from ef45fe470e1e5410db4af87abc5d5055427945ac before 2ce09aabe009453d641a2ceb79e6461a2d4f3876; from ef45fe470e1e5410db4af87abc5d5055427945ac before 67c7f213e052b1aa6caba4a7e25e303bc6997126; from ef45fe470e1e5410db4af87abc5d5055427945ac before d1248436cbef1f924c04255367ff4845ccd9025e | CNA record |
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.5 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.5 | CISA ADP |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | all versions | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.5 | CISA ADP |
linux linux_kernel linux:linux_kernel | from 5.9 before 6.1.129; from 6.2 before 6.6.78; from 6.7 before 6.12.14; from 6.13 before 6.13.3 | NVD |
References
- https://git.kernel.org/stable/c/ffb494f1e7a047bd7a41b13796fcfb08fe5beafb
- https://git.kernel.org/stable/c/38287f779b34dfe959b4b681e909f2d3d52b88be
- https://git.kernel.org/stable/c/431b6ef2714be4d5babb802114987541a88b43b0patch
- https://git.kernel.org/stable/c/993121481b5a87829f1e8163f47158b72679f309patch
- https://git.kernel.org/stable/c/2ce09aabe009453d641a2ceb79e6461a2d4f3876patch
- https://git.kernel.org/stable/c/67c7f213e052b1aa6caba4a7e25e303bc6997126patch
- https://git.kernel.org/stable/c/d1248436cbef1f924c04255367ff4845ccd9025epatch
- https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html
- https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.