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CVE-2026-93795

blk-cgroup: fix leaks and online flag on radix_tree_insert failure

cve-program · severity unknownCVSS unknownCheck source for fixed versionsKEV status unknown
Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-93795

Published

In the Linux kernel, the following vulnerability has been resolved: blk-cgroup: fix leaks and online flag on radix_tree_insert failure When radix_tree_insert() fails in blkg_create(), the error path has two issues: 1. blkg->online is set to true unconditionally, even when the blkg was never fully inserted. Move the assignment inside the success block. 2. The error path calls blkg_put() without first calling percpu_ref_kill(). Because the refcount is still in percpu mode, percpu_ref_put() only does this_cpu_sub() without checking for zero, so blkg_release() is never triggered. This permanently leaks the blkg memory, its percpu iostat, policy data, the parent blkg reference, and the cgroup css reference — the latter preventing the cgroup from ever being destroyed. Fix by replacing blkg_put() with percpu_ref_kill(), matching the pattern used in blkg_destroy().

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-93795

Published

Linux

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "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"
                        }
                    ]
                }

Linux

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "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"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON

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