{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-93795","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-18T17:59:28.789Z","datePublished":"2026-09-24T16:02:28.654Z","dateUpdated":"2026-10-03T10:57:30.314Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-10-03T10:57:30.314Z"},"descriptions":[{"lang":"en","value":"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()."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["block/blk-cgroup.c"],"versions":[{"version":"7fcf2b033b84e261dca283bc2911aaea4b07b525","lessThan":"0f840db042caee9d2f3dcdcf97d6674f6e4c1e30","status":"affected","versionType":"git"},{"version":"7fcf2b033b84e261dca283bc2911aaea4b07b525","lessThan":"f53945d7c712efe63fadbcc5ffed6370871fd0d3","status":"affected","versionType":"git"},{"version":"7fcf2b033b84e261dca283bc2911aaea4b07b525","lessThan":"ada8270ccdb6f212da5eb22614c28ea418746a4a","status":"affected","versionType":"git"},{"version":"7fcf2b033b84e261dca283bc2911aaea4b07b525","lessThan":"c3650be82ef6e7af13b79b2d10a7363bdf54aa7f","status":"affected","versionType":"git"},{"version":"7fcf2b033b84e261dca283bc2911aaea4b07b525","lessThan":"6e85f02d45b5977c0326a8d854c6db878aa6b34a","status":"affected","versionType":"git"},{"version":"7fcf2b033b84e261dca283bc2911aaea4b07b525","lessThan":"4c0d150fb98ea40760611979f4e664c244b20966","status":"affected","versionType":"git"},{"version":"7fcf2b033b84e261dca283bc2911aaea4b07b525","lessThan":"dbbca20764382b4d411ec2918f4e278ffe547acc","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["block/blk-cgroup.c"],"versions":[{"version":"5.0","status":"affected"},{"version":"0","lessThan":"5.0","status":"unaffected","versionType":"semver"},{"version":"5.10.271","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.222","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.189","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.158","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.111","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.53","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"5.10.271"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"5.15.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"6.12.111"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/0f840db042caee9d2f3dcdcf97d6674f6e4c1e30"},{"url":"https://git.kernel.org/stable/c/f53945d7c712efe63fadbcc5ffed6370871fd0d3"},{"url":"https://git.kernel.org/stable/c/ada8270ccdb6f212da5eb22614c28ea418746a4a"},{"url":"https://git.kernel.org/stable/c/c3650be82ef6e7af13b79b2d10a7363bdf54aa7f"},{"url":"https://git.kernel.org/stable/c/6e85f02d45b5977c0326a8d854c6db878aa6b34a"},{"url":"https://git.kernel.org/stable/c/4c0d150fb98ea40760611979f4e664c244b20966"},{"url":"https://git.kernel.org/stable/c/dbbca20764382b4d411ec2918f4e278ffe547acc"}],"title":"blk-cgroup: fix leaks and online flag on radix_tree_insert failure","x_generator":{"engine":"bippy-1.2.0"}}}}