Answer in brief
CVE-2026-43438 records a High severity (CVSS 7.8) vulnerability in sched_ext: Remove redundant css_put() in scx_cgroup_init(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=8195136669661fdfe54e9a8923c33b31c92fc1da <cc095cd305fddbe25a968e4a78436ff9476cf0f6 || >=8195136669661fdfe54e9a8923c33b31c92fc1da <6eaaa67d6998f6c30c462b140db8c062e07ec473 || >=8195136669661fdfe54e9a8923c33b31c92fc1da <bf50f3285eda8a0173625fcdb5f183f96e1008cd || >=8195136669661fdfe54e9a8923c33b31c92fc1da <1336b579f6079fb8520be03624fcd9ba443c930b | cc095cd305fddbe25a968e4a78436ff9476cf0f6, 6eaaa67d6998f6c30c462b140db8c062e07ec473, bf50f3285eda8a0173625fcdb5f183f96e1008cd, 1336b579f6079fb8520be03624fcd9ba443c930b |
| Linux/Linuxgeneric | 6.12 | Not reported |
Published upstream
May 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: sched_ext: Remove redundant css_put() in scx_cgroup_init() The iterator css_for_each_descendant_pre() walks the cgroup hierarchy under cgroup_lock(). It does not increment the reference counts on yielded css structs. According to the cgroup documentation, css_put() should only be used to release a reference obtained via css_get() or css_tryget_online(). Since the iterator does not use either of these to acquire a reference, calling css_put() in the error path of scx_cgroup_init() causes a refcount underflow. Remove the unbalanced css_put() to prevent a potential Use-After-Free (UAF) vulnerability.
Quoted source text, attributed separately from HOL analysis.