CVE-2026-46154
Use-After-Free in Linux Kernel Sched Ext
Publication date: 2026-05-28
Last updated on: 2026-05-28
Assigner: kernel.org
Description
Description
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Exploitability
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
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AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability exists in the Linux kernel's scheduler extension (sched_ext) related to how it handles the scx_root pointer in cgroup setters. Specifically, functions like scx_group_set_weight, scx_group_set_idle, and scx_group_set_bandwidth cache the scx_root pointer before acquiring a read-write semaphore (scx_cgroup_ops_rwsem). Because of this, the cached pointer can become stale if the scheduler is disabled and freed while another scheduler is enabled in between these operations. This leads to a use-after-free (UAF) condition when the code dereferences the freed pointer, potentially causing undefined behavior or crashes.
How can this vulnerability impact me? :
The use-after-free vulnerability in the Linux kernel scheduler extension can lead to system instability, crashes, or potentially allow an attacker to execute arbitrary code with kernel privileges. This can compromise the security and reliability of the affected system, potentially leading to denial of service or privilege escalation.