{"id":"CVE-2025-21745","revision":null,"records":[{"revision":"47aeff39b6074be5b0677ad481533b77","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-21745","aliases":[],"title":"blk-cgroup: Fix class @block_class's subsystem refcount leakage","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nblk-cgroup: Fix class @block_class's subsystem refcount leakage\n\nblkcg_fill_root_iostats() iterates over @block_class's devices by\nclass_dev_iter_(init|next)(), but does not end iterating with\nclass_dev_iter_exit(), so causes the class's subsystem refcount leakage.\n\nFix by ending the iterating with class_dev_iter_exit().","state":0,"publishedAt":"2025-02-27T02:12:17.853+00:00","modifiedAt":"2026-10-15T01:03:57.276+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"block/blk-cgroup.c\"\n ],\n \"versions\": [\n {\n \"version\": \"ef45fe470e1e5410db4af87abc5d5055427945ac\",\n \"lessThan\": \"ffb494f1e7a047bd7a41b13796fcfb08fe5beafb\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ef45fe470e1e5410db4af87abc5d5055427945ac\",\n \"lessThan\": \"38287f779b34dfe959b4b681e909f2d3d52b88be\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ef45fe470e1e5410db4af87abc5d5055427945ac\",\n \"lessThan\": \"431b6ef2714be4d5babb802114987541a88b43b0\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ef45fe470e1e5410db4af87abc5d5055427945ac\",\n \"lessThan\": \"993121481b5a87829f1e8163f47158b72679f309\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ef45fe470e1e5410db4af87abc5d5055427945ac\",\n \"lessThan\": \"2ce09aabe009453d641a2ceb79e6461a2d4f3876\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ef45fe470e1e5410db4af87abc5d5055427945ac\",\n \"lessThan\": \"67c7f213e052b1aa6caba4a7e25e303bc6997126\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ef45fe470e1e5410db4af87abc5d5055427945ac\",\n \"lessThan\": \"d1248436cbef1f924c04255367ff4845ccd9025e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"block/blk-cgroup.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.9\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.9\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.235\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.179\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.129\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.78\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.14\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.13.3\",\n \"lessThanOrEqual\": \"6.13.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.14\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/ffb494f1e7a047bd7a41b13796fcfb08fe5beafb","https://git.kernel.org/stable/c/38287f779b34dfe959b4b681e909f2d3d52b88be","https://git.kernel.org/stable/c/431b6ef2714be4d5babb802114987541a88b43b0","https://git.kernel.org/stable/c/993121481b5a87829f1e8163f47158b72679f309","https://git.kernel.org/stable/c/2ce09aabe009453d641a2ceb79e6461a2d4f3876","https://git.kernel.org/stable/c/67c7f213e052b1aa6caba4a7e25e303bc6997126","https://git.kernel.org/stable/c/d1248436cbef1f924c04255367ff4845ccd9025e"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-21745","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-21745","identifiers":["CVE-2025-21745"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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