CVE-2026-43438
7.8 HIGHIn the Linux kernel, the following vulnerability has been resolved: sched_ext: Remove redundant css_put() in scx_cgroup_init() The iter...
Published: 2026-05-08 · Last updated: 2026-05-21
Severity and scoring
- CVSS
- 7.8 HIGH
- Vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CWE
- CWE-416
Affected products
| Vendor | Product |
|---|---|
| linux | linux_kernel |
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.
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-43438
- [Patch]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
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