CVE-2026-43438

HIGH EPSS 2.6%
Published May 8, 20261mo ago · Modified Jun 17, 20261w ago
7.8 CVSS 3.1
High
Find Similar
Published May 8, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
2.6% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-416 Use After Free Memory Safety

Affected Products 5

VendorProductVersionRange
linuxlinux_kernel*≥6.12  –  <6.12.78
linuxlinux_kernel*≥6.13  –  <6.18.19
linuxlinux_kernel*≥6.19  –  <6.19.9
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 4

  • git.kernel.org https://git.kernel.org/stable/c/1336b579f6079fb8520be03624fcd9ba443c930b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6eaaa67d6998f6c30c462b140db8c062e07ec473
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/bf50f3285eda8a0173625fcdb5f183f96e1008cd
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/cc095cd305fddbe25a968e4a78436ff9476cf0f6
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/1336b579f6079fb8520be03624fcd9ba443c930b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6eaaa67d6998f6c30c462b140db8c062e07ec473
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/bf50f3285eda8a0173625fcdb5f183f96e1008cd
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/cc095cd305fddbe25a968e4a78436ff9476cf0f6
    Patch