| Name | CVE-2026-93795 |
| Description | 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(). |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-4817-1, DSA-6528-1 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| linux (PTS) | bookworm | 6.1.176-1 | vulnerable |
| bookworm (security) | 6.1.187-1 | vulnerable | |
| trixie | 6.12.107-1 | vulnerable | |
| trixie (security) | 6.12.111-1 | fixed | |
| forky | 7.2.9-1 | fixed | |
| sid | 7.2.10-1 | fixed | |
| linux-6.12 (PTS) | bookworm (security) | 6.12.111-1~deb12u1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| linux | source | trixie | 6.12.111-1 | DSA-6528-1 | ||
| linux | source | (unstable) | 7.2.6-1 | |||
| linux-6.12 | source | bookworm | 6.12.111-1~deb12u1 | DLA-4817-1 |
https://git.kernel.org/linus/dbbca20764382b4d411ec2918f4e278ffe547acc (7.2-rc4)