What is CVE-2026-23307?

CVE-2026-23307 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 2.6.32 onward and patched in 5.10.253, 5.15.203, 6.1.167 and others. CVE-2026-23307 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-23307?

CVE-2026-23307 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-2026-23307?

Yes, CVE-2026-23307 has been patched. Fixed versions include 5.10.253, 5.15.203, 6.1.167 and others. If you are running Linux kernel 2.6.32 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-23307 actively exploited?

CVE-2026-23307 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-23307

Medium

In the Linux kernel, the following vulnerability has been resolved: can: ems_usb: ems_usb_read_bulk_callback(): check the proper length of a message When looking at the data in a USB urb, the actual_length is the size of the buffer passed to the driver, not the transfer_buffer_length which is set by the driver as the max size of the buffer. When parsing the messages in ems_usb_read_bulk_callback() properly check the size both at the beginning of parsing the message to make sure it is big enough for the expected structure, and at the end of the message to make sure we don't overflow past the end of the buffer for the next message.

Package Linux Kernel

Published 2026-03-25

Last modified 2026-05-28

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 2.6.32 and later are affected. Fixed in 5.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.77, 6.18.17, 6.19.7, 7.0 and their respective stable series.

Affected from

≥ 2.6.32

Fixed in

✓ 5.10.253 5.10.x ✓ 5.15.203 5.15.x ✓ 6.1.167 6.1.x ✓ 6.6.130 6.6.x ✓ 6.12.77 6.12.x ✓ 6.18.17 6.18.x ✓ 6.19.7 6.19.x ✓ 7.0

References

The following references provide additional information about CVE-2026-23307 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/1818974e1b5ef200e27f144c8cb8a246420bb54d
Patch
Kernel patch commit
https://git.kernel.org/stable/c/18f75b9cbdc3703f15965425ab69dee509b07785
Patch
Kernel patch commit
https://git.kernel.org/stable/c/1cf469026d4a2308eaa91d04dca4a900d07a5c2e
Patch

8 patch commits total View all on NVD

Details

CVE ID CVE-2026-23307

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2026-03-25

Modified 2026-05-28

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-23307?

CVE-2026-23307 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 2.6.32 onward and has been patched in 5.10.253, 5.15.203, 6.1.167 and others. CVE-2026-23307 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-23307?

CVE-2026-23307 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-2026-23307?

Yes — CVE-2026-23307 has been patched. Fixed versions include 5.10.253, 5.15.203, 6.1.167 and others. If you are running Linux kernel 2.6.32 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-23307 actively exploited?

No — CVE-2026-23307 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.