{"id":"CVE-2026-93795","revision":"d5aab98d83284afd81f5b8a075d5b0cb","records":[{"revision":"d5aab98d83284afd81f5b8a075d5b0cb","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-93795","aliases":[],"title":"blk-cgroup: fix leaks and online flag on radix_tree_insert failure","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nblk-cgroup: fix leaks and online flag on radix_tree_insert failure\n\nWhen radix_tree_insert() fails in blkg_create(), the error path has two\nissues:\n\n1. blkg->online is set to true unconditionally, even when the blkg was\n   never fully inserted.  Move the assignment inside the success block.\n\n2. The error path calls blkg_put() without first calling\n   percpu_ref_kill().  Because the refcount is still in percpu mode,\n   percpu_ref_put() only does this_cpu_sub() without checking for zero,\n   so blkg_release() is never triggered.  This permanently leaks the\n   blkg memory, its percpu iostat, policy data, the parent blkg\n   reference, and the cgroup css reference — the latter preventing the\n   cgroup from ever being destroyed.\n\nFix by replacing blkg_put() with percpu_ref_kill(), matching the pattern\nused in blkg_destroy().","state":0,"publishedAt":"2026-09-24T16:02:28.654+00:00","modifiedAt":"2026-10-03T10:57:30.314+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\": \"7fcf2b033b84e261dca283bc2911aaea4b07b525\",\n                            \"lessThan\": \"0f840db042caee9d2f3dcdcf97d6674f6e4c1e30\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7fcf2b033b84e261dca283bc2911aaea4b07b525\",\n                            \"lessThan\": \"f53945d7c712efe63fadbcc5ffed6370871fd0d3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7fcf2b033b84e261dca283bc2911aaea4b07b525\",\n                            \"lessThan\": \"ada8270ccdb6f212da5eb22614c28ea418746a4a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7fcf2b033b84e261dca283bc2911aaea4b07b525\",\n                            \"lessThan\": \"c3650be82ef6e7af13b79b2d10a7363bdf54aa7f\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7fcf2b033b84e261dca283bc2911aaea4b07b525\",\n                            \"lessThan\": \"6e85f02d45b5977c0326a8d854c6db878aa6b34a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7fcf2b033b84e261dca283bc2911aaea4b07b525\",\n                            \"lessThan\": \"4c0d150fb98ea40760611979f4e664c244b20966\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"7fcf2b033b84e261dca283bc2911aaea4b07b525\",\n                            \"lessThan\": \"dbbca20764382b4d411ec2918f4e278ffe547acc\",\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\": \"5.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.0\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.271\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.222\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.189\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.158\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.111\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.53\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/0f840db042caee9d2f3dcdcf97d6674f6e4c1e30","https://git.kernel.org/stable/c/f53945d7c712efe63fadbcc5ffed6370871fd0d3","https://git.kernel.org/stable/c/ada8270ccdb6f212da5eb22614c28ea418746a4a","https://git.kernel.org/stable/c/c3650be82ef6e7af13b79b2d10a7363bdf54aa7f","https://git.kernel.org/stable/c/6e85f02d45b5977c0326a8d854c6db878aa6b34a","https://git.kernel.org/stable/c/4c0d150fb98ea40760611979f4e664c244b20966","https://git.kernel.org/stable/c/dbbca20764382b4d411ec2918f4e278ffe547acc"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-93795","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-93795","identifiers":["CVE-2026-93795"]},"retained":false,"historicalAffected":[]}],"coverage":[]}