{
    "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"
                                },
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.0",
                                    "versionEndExcluding": "6.12.111"
                                },
                                {
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                                    "versionStartIncluding": "5.0",
                                    "versionEndExcluding": "6.18.53"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.0",
                                    "versionEndExcluding": "7.2"
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            ],
            "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"
            }
        }
    }
}