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CVE-2025-21745— blk-cgroup: Fix class @block_class's subsystem refcount leakage

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于blk-cgroup中未正确结束设备迭代，导致子系统引用计数泄漏。

AI Predicted 5.0 Difficulty: Theoretical EPSS 0.27% · P18

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux ef45fe470e1e5410db4af87abc5d5055427945ac< ffb494f1e7a047bd7a41b13796fcfb08fe5beafb affected
ef45fe470e1e5410db4af87abc5d5055427945ac< 38287f779b34dfe959b4b681e909f2d3d52b88be affected
ef45fe470e1e5410db4af87abc5d5055427945ac< 431b6ef2714be4d5babb802114987541a88b43b0 affected
ef45fe470e1e5410db4af87abc5d5055427945ac< 993121481b5a87829f1e8163f47158b72679f309 affected
ef45fe470e1e5410db4af87abc5d5055427945ac< 2ce09aabe009453d641a2ceb79e6461a2d4f3876 affected
ef45fe470e1e5410db4af87abc5d5055427945ac< 67c7f213e052b1aa6caba4a7e25e303bc6997126 affected
ef45fe470e1e5410db4af87abc5d5055427945ac< d1248436cbef1f924c04255367ff4845ccd9025e affected
5.9 affected
… +8 more rows
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I. Basic Information for CVE-2025-21745

Vulnerability Information
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Vulnerability Title
blk-cgroup: Fix class @block_class's subsystem refcount leakage
Source: CVE Program / CVE List V5
Vulnerability 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().
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于blk-cgroup中未正确结束设备迭代，导致子系统引用计数泄漏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux ef45fe470e1e5410db4af87abc5d5055427945ac ~ ffb494f1e7a047bd7a41b13796fcfb08fe5beafb -
Linux Linux 5.9 -

II. Public POCs for CVE-2025-21745

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III. Intelligence Information for CVE-2025-21745

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Patches & Fixes for CVE-2025-21745 (5)

Other References for CVE-2025-21745 (2)

Same Patch Batch · Linux · 2025-02-27 · 177 CVEs total

CVE-2025-21796 9.8 CRITICAL nfsd: clear acl_access/acl_default after releasing them
CVE-2025-21805 9.8 CRITICAL RDMA/rtrs: Add missing deinit() call
CVE-2025-21707 9.8 CRITICAL mptcp: consolidate suboption status
CVE-2025-21748 9.8 CRITICAL ksmbd: fix integer overflows on 32 bit systems
CVE-2024-58006 9.6 CRITICAL PCI: dwc: ep: Prevent changing BAR size/flags in pci_epc_set_bar()
CVE-2025-21735 8.8 HIGH NFC: nci: Add bounds checking in nci_hci_create_pipe()
CVE-2024-57999 8.8 HIGH powerpc/pseries/iommu: IOMMU incorrectly marks MMIO range in DDW
CVE-2024-57997 8.8 HIGH wifi: wcn36xx: fix channel survey memory allocation size
CVE-2024-57995 8.8 HIGH wifi: ath12k: fix read pointer after free in ath12k_mac_assign_vif_to_vdev()
CVE-2025-21710 8.2 HIGH tcp: correct handling of extreme memory squeeze
CVE-2024-57973 8.1 HIGH rdma/cxgb4: Prevent potential integer overflow on 32bit
CVE-2025-21760 8.1 HIGH ndisc: extend RCU protection in ndisc_send_skb()
CVE-2025-21766 8.1 HIGH ipv4: use RCU protection in __ip_rt_update_pmtu()
CVE-2025-21765 8.1 HIGH ipv6: use RCU protection in ip6_default_advmss()
CVE-2025-21762 8.1 HIGH arp: use RCU protection in arp_xmit()
CVE-2025-21730 7.8 HIGH wifi: rtw89: avoid to init mgnt_entry list twice when WoWLAN failed
CVE-2025-21729 7.8 HIGH wifi: rtw89: fix race between cancel_hw_scan and hw_scan completion
CVE-2025-21772 7.8 HIGH partitions: mac: fix handling of bogus partition table
CVE-2024-52560 7.8 HIGH fs/ntfs3: Mark inode as bad as soon as error detected in mi_enum_attr()
CVE-2024-58002 7.8 HIGH media: uvcvideo: Remove dangling pointers

Showing top 20 of 177 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-21745

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