CVE-2026-93795blk-cgroup: fix leaks and online flag on radix_tree_insert failure
Updated under an hour ago ()
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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().
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 3, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 7fcf2b033b84e261dca283bc2911aaea4b07b525 builds before 0f840db042caee9d2f3dcdcf97d6674f6e4c1e30; from 7fcf2b033b84e261dca283bc2911aaea4b07b525 before f53945d7c712efe63fadbcc5ffed6370871fd0d3; from 7fcf2b033b84e261dca283bc2911aaea4b07b525 before ada8270ccdb6f212da5eb22614c28ea418746a4a; from 7fcf2b033b84e261dca283bc2911aaea4b07b525 before c3650be82ef6e7af13b79b2d10a7363bdf54aa7f; 7fcf2b033b84e261dca283bc2911aaea4b07b525 builds before 6e85f02d45b5977c0326a8d854c6db878aa6b34a; 7fcf2b033b84e261dca283bc2911aaea4b07b525 builds before 4c0d150fb98ea40760611979f4e664c244b20966; from 7fcf2b033b84e261dca283bc2911aaea4b07b525 before dbbca20764382b4d411ec2918f4e278ffe547acc | CNA record |
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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.