What is CVE-2026-53294?

CVE-2026-53294 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, affecting Linux kernel versions from 4.4 onward and patched in 5.10.258, 5.15.209, 6.1.175 and others. CVE-2026-53294 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-53294?

CVE-2026-53294 has a CVSS score of 7.8 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2026-53294?

Yes, CVE-2026-53294 has been patched. Fixed versions include 5.10.258, 5.15.209, 6.1.175 and others. If you are running Linux kernel 4.4 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-53294 actively exploited?

CVE-2026-53294 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-53294

High

In the Linux kernel, the following vulnerability has been resolved: mailbox: mailbox-test: don't free the reused channel The RX channel can be aliased to the TX channel if it has a different MMIO. This special case needs to be handled when freeing the channels otherwise a double-free occurs.

Package Linux Kernel

Published 2026-06-26

Last modified 2026-07-08

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.8

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Weakness type

CWE-415

CVE-2026-53294 is classified as CWE-415

See CWE-415 on MITRE CWE for full details on this weakness type.

Affected versions

Linux kernel versions 4.4 and later are affected. Fixed in 5.10.258, 5.15.209, 6.1.175, 6.6.141, 6.12.91, 6.18.33, 7.0.10, 7.1 and their respective stable series.

Affected from

≥ 4.4

Fixed in

✓ 5.10.258 5.10.x ✓ 5.15.209 5.15.x ✓ 6.1.175 6.1.x ✓ 6.6.141 6.6.x ✓ 6.12.91 6.12.x ✓ 6.18.33 6.18.x ✓ 7.0.10 7.0.x ✓ 7.1

References

8 total

Kernel Git
https://git.kernel.org/stable/c/240c71a2aea36a1a4210f911a1c32ea88777e8e4

Patch
Kernel Git
https://git.kernel.org/stable/c/3afca89fae501dbd7421e1777b5b8f033b1d98d0

Patch
Kernel Git
https://git.kernel.org/stable/c/5c209299b0113e289e238fa5f2e8f00c59f76060

Patch
Kernel Git
https://git.kernel.org/stable/c/5d4f3d0f64f1016cb78b400a70b67df91fac99b5

Patch
Kernel Git
https://git.kernel.org/stable/c/82f6dcea46cf5de65c4ba7283f7c7b34de4a324d

Patch

Showing 5 of 8 references View all on NVD

Details

CVE ID CVE-2026-53294

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2026-06-26

Modified 2026-07-08

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-53294?

CVE-2026-53294 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . It affects Linux kernel versions from 4.4 onward and has been patched in 5.10.258, 5.15.209, 6.1.175 and others. CVE-2026-53294 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-53294?

CVE-2026-53294 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2026-53294?

Yes. CVE-2026-53294 has been patched. Fixed versions include 5.10.258, 5.15.209, 6.1.175 and others. If you are running Linux kernel 4.4 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-53294 actively exploited?

No. CVE-2026-53294 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.