What is CVE-2026-43482?

CVE-2026-43482 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 6.12 onward and patched in 6.12.78, 6.18.20, 6.19.9 and others. CVE-2026-43482 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-43482?

CVE-2026-43482 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2026-43482?

Yes, CVE-2026-43482 has been patched. Fixed versions include 6.12.78, 6.18.20, 6.19.9 and others. If you are running Linux kernel 6.12 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-43482 actively exploited?

CVE-2026-43482 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-43482

Medium

In the Linux kernel, the following vulnerability has been resolved: sched_ext: Disable preemption between scx_claim_exit() and kicking helper work scx_claim_exit() atomically sets exit_kind, which prevents scx_error() from triggering further error handling. After claiming exit, the caller must kick the helper kthread work which initiates bypass mode and teardown. If the calling task gets preempted between claiming exit and kicking the helper work, and the BPF scheduler fails to schedule it back (since error handling is now disabled), the helper work is never queued, bypass mode never activates, tasks stop being dispatched, and the system wedges. Disable preemption across scx_claim_exit() and the subsequent work kicking in all callers - scx_disable() and scx_vexit(). Add lockdep_assert_preemption_disabled() to scx_claim_exit() to enforce the requirement.

Package Linux Kernel

Published 2026-05-13

Last modified 2026-06-26

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

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

Affected versions

Linux kernel versions 6.12 and later are affected. Fixed in 6.12.78, 6.18.20, 6.19.9, 7.0 and their respective stable series.

Affected from

≥ 6.12

Fixed in

✓ 6.12.78 6.12.x ✓ 6.18.20 6.18.x ✓ 6.19.9 6.19.x ✓ 7.0

References

4 total

Kernel Git
https://git.kernel.org/stable/c/41423912f7ac7494ccd6eef411227b4efce740e0

Patch
Kernel Git
https://git.kernel.org/stable/c/5131dbec2c10961b34f844bc30b400c3fa0bcc72

Patch
Kernel Git
https://git.kernel.org/stable/c/522acaae34aa7e05859260056b39c7c030592a0c

Patch
Kernel Git
https://git.kernel.org/stable/c/83236b2e43dba00bee5b82eb5758816b1a674f6a

Patch

Details

CVE ID CVE-2026-43482

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2026-05-13

Modified 2026-06-26

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-43482?

CVE-2026-43482 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 6.12 onward and has been patched in 6.12.78, 6.18.20, 6.19.9 and others. CVE-2026-43482 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-43482?

CVE-2026-43482 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2026-43482?

Yes. CVE-2026-43482 has been patched. Fixed versions include 6.12.78, 6.18.20, 6.19.9 and others. If you are running Linux kernel 6.12 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-43482 actively exploited?

No. CVE-2026-43482 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.