Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: sched_ext: Read scx_root under scx_cgroup_ops_rwsem in cgroup setters scx_group_set_{weight,idle,bandwidth}() cache scx_root before acquiring scx_cgroup_ops_rwsem, so the pointer can be stale by the time the op runs. If the loaded scheduler is disabled and freed (via RCU work) and another is enabled between the naked load and the rwsem acquire, the reader sees scx_cgroup_enabled=true (the new scheduler's) but dereferences the freed one - UAF on SCX_HAS_OP(sch, ...) / SCX_CALL_OP(sch, ...). scx_cgroup_enabled is toggled only under scx_cgroup_ops_rwsem write (scx_cgroup_{init,exit}), so reading scx_root inside the rwsem read section correlates @sch with the enabled snapshot.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.18, < 6.18.32 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/0f54f6355575971673d8aac7da107ec4178e45bdPatch
- https://git.kernel.org/stable/c/80afd4c84bc8f5e80145ce35279f5ce53f6043dbPatch
- https://git.kernel.org/stable/c/ce9aaa3af445c391735c9d000c4db60dfd5640d4Patch
FAQ
What is CVE-2026-46154?
CVE-2026-46154 is a vulnerability with a CVSS score of 7.0 (HIGH). In the Linux kernel, the following vulnerability has been resolved: sched_ext: Read scx_root under scx_cgroup_ops_rwsem in cgroup setters scx_group_set_{weight,idle,bandwidth}() cache scx_root befor...
How severe is CVE-2026-46154?
CVE-2026-46154 has been rated HIGH with a CVSS base score of 7.0/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-46154?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.