What is CVE-2026-46154?

CVE-2026-46154 is a High severity Linux kernel vulnerability with a CVSS score of 7.0 out of 10, classified as a Use After Free flaw (CWE-416), affecting Linux kernel versions from 6.18 onward and patched in 6.18.32, 7.0.7 and 7.1. CVE-2026-46154 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-46154?

CVE-2026-46154 has a CVSS score of 7.0 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2026-46154?

Yes, CVE-2026-46154 has been patched. Fixed versions include 6.18.32, 7.0.7 and 7.1. If you are running Linux kernel 6.18 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-46154 actively exploited?

CVE-2026-46154 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Use After Free (CWE-416)?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/416.html

CVE-2026-46154

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 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.

Package Linux Kernel

Published 2026-05-28

Last modified 2026-06-09

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.0

out of 10

High

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness type

CWE-416

CVE-2026-46154 is a Use After Free vulnerability

What is Use After Free?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. Learn more on MITRE CWE

Affected versions

Linux kernel versions 6.18 and later are affected. Fixed in 6.18.32, 7.0.7, 7.1 and their respective stable series.

Affected from

≥ 6.18

Fixed in

✓ 6.18.32 6.18.x ✓ 7.0.7 7.0.x ✓ 7.1

References

3 total

Kernel Git
https://git.kernel.org/stable/c/0f54f6355575971673d8aac7da107ec4178e45bd

Patch
Kernel Git
https://git.kernel.org/stable/c/80afd4c84bc8f5e80145ce35279f5ce53f6043db

Patch
Kernel Git
https://git.kernel.org/stable/c/ce9aaa3af445c391735c9d000c4db60dfd5640d4

Patch

Details

CVE ID CVE-2026-46154

Severity High

CVSS score 7.0 / 10

CVSS version 3.1

Published 2026-05-28

Modified 2026-06-09

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-46154?

CVE-2026-46154 is a High severity Linux kernel vulnerability with a CVSS score of 7.0 out of 10 , classified as an Use After Free flaw (CWE-416) . It affects Linux kernel versions from 6.18 onward and has been patched in 6.18.32, 7.0.7 and 7.1. CVE-2026-46154 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-46154?

CVE-2026-46154 has a CVSS score of 7.0 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2026-46154?

Yes. CVE-2026-46154 has been patched. Fixed versions include 6.18.32, 7.0.7 and 7.1. If you are running Linux kernel 6.18 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-46154 actively exploited?

No. CVE-2026-46154 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.