Copyright © 2012 Red Hat, Inc. All rights reserved. Important 2026-07-24T00:00:00 kernel: Linux kernel (sched_ext): Use-After-Free vulnerability in scx_root_enable_workfn() 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CWE-825

In the Linux kernel, the following vulnerability has been resolved: sched_ext: Avoid UAF in scx_root_enable_workfn() init failure path In scx_root_enable_workfn(), put_task_struct(p) is called before scx_error() dereferences p->comm and p->pid. If the iterator's reference is the last drop, the task is freed synchronously and the deref becomes a UAF. Move put_task_struct() past scx_error().

A flaw was found in the Linux kernel's sched_ext component. This Use-After-Free (UAF) vulnerability occurs in the `scx_root_enable_workfn()` function. Specifically, `put_task_struct(p)` is called before `scx_error()` dereferences `p->comm` and `p->pid`, leading to a premature freeing of the task. A local attacker could exploit this to potentially achieve arbitrary code execution or privilege escalation.

Red Hat Enterprise Linux 10 Not affected kernel Red Hat Enterprise Linux 6 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel-rt Red Hat Enterprise Linux 8 Not affected kernel Red Hat Enterprise Linux 8 Not affected kernel-rt Red Hat Enterprise Linux 9 Not affected kernel Red Hat Enterprise Linux 9 Not affected kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-64226 https://nvd.nist.gov/vuln/detail/CVE-2026-64226 https://lore.kernel.org/linux-cve-announce/2026072417-CVE-2026-64226-590d@gregkh/T