CVE-2026-46154 Details
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.
A use-after-free vulnerability has been identified in the Linux kernel's scheduler extension, specifically within the cgroup operations for managing task groups. This issue arises because the function that sets cgroup parameters caches a pointer to the current scheduler group before acquiring a necessary lock. As a result, the pointer can become stale, leading to the potential dereferencing of a freed scheduler object. The vulnerability occurs if the loaded scheduler is disabled and freed, and another scheduler is enabled before the lock is acquired. This flaw allows for unauthorized access to scheduler operations, creating a use-after-free condition that could be exploited.
Users can upgrade to the latest stable version of the Linux kernel, where this vulnerability has been addressed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/0f54f6355575971673d8aac7da107ec4178e45bd | kernel.org | Patch |
| https://git.kernel.org/stable/c/80afd4c84bc8f5e80145ce35279f5ce53f6043db | kernel.org | Patch |
| https://git.kernel.org/stable/c/ce9aaa3af445c391735c9d000c4db60dfd5640d4 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-416 | Use After Free | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.18, < 6.18.32 >= 6.19, < 7.0.7 7.1 rc1 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| Jun 9, 2026 | Initial Analysis | [email protected] |
| May 30, 2026 | CVE Modified | kernel.org |
| May 28, 2026 | New CVE Received | kernel.org |