CVE-2025-21745blk-cgroup: Fix class @block_class's subsystem refcount leakage
- 5.5MediumCVSS base score
- 0.27%Exploitation in 30 daysEPSS · top 81% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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().
Timeline
ID reserved
By Linux
- 2 months later
· 2 months later
Published
- 21 months later
· 21 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.27% · top 81% of all CVEs (15 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected ef45fe470e1e5410db4af87abc5d5055427945ac – < ffb494f1e7a047bd7a41b13796fcfb08fe5beafb
- affected ef45fe470e1e5410db4af87abc5d5055427945ac – < 38287f779b34dfe959b4b681e909f2d3d52b88be
- affected ef45fe470e1e5410db4af87abc5d5055427945ac – < 431b6ef2714be4d5babb802114987541a88b43b0
- affected ef45fe470e1e5410db4af87abc5d5055427945ac – < 993121481b5a87829f1e8163f47158b72679f309
- affected ef45fe470e1e5410db4af87abc5d5055427945ac – < 2ce09aabe009453d641a2ceb79e6461a2d4f3876
- affected ef45fe470e1e5410db4af87abc5d5055427945ac – < 67c7f213e052b1aa6caba4a7e25e303bc6997126
- affected ef45fe470e1e5410db4af87abc5d5055427945ac – < d1248436cbef1f924c04255367ff4845ccd9025e
- affected 5.9
- unaffected < 5.9
- unaffected 5.10.235 – ≤ 5.10.*
- unaffected 5.15.179 – ≤ 5.15.*
- unaffected 6.1.129 – ≤ 6.1.*
- unaffected 6.6.78 – ≤ 6.6.*
- unaffected 6.12.14 – ≤ 6.12.*
- unaffected 6.13.3 – ≤ 6.13.*
- unaffected 6.14 – ≤ *
References
References14
- https://git.kernel.org/stable/c/ffb494f1e7a047bd7a41b13796fcfb08fe5beafb (opens in a new tab)
- https://git.kernel.org/stable/c/38287f779b34dfe959b4b681e909f2d3d52b88be (opens in a new tab)
- https://git.kernel.org/stable/c/431b6ef2714be4d5babb802114987541a88b43b0 (opens in a new tab)
- https://git.kernel.org/stable/c/993121481b5a87829f1e8163f47158b72679f309 (opens in a new tab)
- https://git.kernel.org/stable/c/2ce09aabe009453d641a2ceb79e6461a2d4f3876 (opens in a new tab)
- https://git.kernel.org/stable/c/67c7f213e052b1aa6caba4a7e25e303bc6997126 (opens in a new tab)
- https://git.kernel.org/stable/c/d1248436cbef1f924c04255367ff4845ccd9025e (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-5179 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-21745)Record last updated .