CVE-2026-43438

Description

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.

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Produits concernés

• Linux
• Linux linux kernel

Scores CVSS

Faiblesses (CWE)

• CWE-416

Références

• https://git.kernel.org/stable/c/1336b579f6079fb8520be03624fcd9ba443c930b Patch
• https://git.kernel.org/stable/c/6eaaa67d6998f6c30c462b140db8c062e07ec473 Patch
• https://git.kernel.org/stable/c/bf50f3285eda8a0173625fcdb5f183f96e1008cd Patch
• https://git.kernel.org/stable/c/cc095cd305fddbe25a968e4a78436ff9476cf0f6 Patch

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories