CVE-2026-43438
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_descen…
Impact
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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Linux | Linux Kernel | from 6.12 before 6.12.78 from 6.13 before 6.18.19 from 6.19 before 6.19.9 Version 7.0 |
Weakness classification
References
- NVD record
- CVE.org record
- https://git.kernel.org/stable/c/1336b579f6079fb8520be03624fcd9ba443c930b
- https://git.kernel.org/stable/c/6eaaa67d6998f6c30c462b140db8c062e07ec473
- https://git.kernel.org/stable/c/bf50f3285eda8a0173625fcdb5f183f96e1008cd
- https://git.kernel.org/stable/c/cc095cd305fddbe25a968e4a78436ff9476cf0f6