What is CVE-2026-45865?

CVE-2026-45865 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 5.18 onward and patched in 6.1.165, 6.6.128, 6.12.75 and others. CVE-2026-45865 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-45865?

CVE-2026-45865 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-2026-45865?

Yes, CVE-2026-45865 has been patched. Fixed versions include 6.1.165, 6.6.128, 6.12.75 and others. If you are running Linux kernel 5.18 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-45865 actively exploited?

CVE-2026-45865 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-45865

Medium

In the Linux kernel, the following vulnerability has been resolved: mctp i2c: initialise event handler read bytes Set a 0xff value for i2c reads of an mctp-i2c device. Otherwise reads will return "val" from the i2c bus driver. For i2c-aspeed and i2c-npcm7xx that is a stack uninitialised u8. Tested with "i2ctransfer -y 1 r10@0x34" where 0x34 is a mctp-i2c instance, now it returns all 0xff.

Package Linux Kernel

Published 2026-05-27

Last modified 2026-06-25

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 5.18 and later are affected. Fixed in 6.1.165, 6.6.128, 6.12.75, 6.18.14, 6.19.4, 7.0 and their respective stable series.

Affected from

≥ 5.18

Fixed in

✓ 6.1.165 6.1.x ✓ 6.6.128 6.6.x ✓ 6.12.75 6.12.x ✓ 6.18.14 6.18.x ✓ 6.19.4 6.19.x ✓ 7.0

References

6 total

Kernel Git
https://git.kernel.org/stable/c/11f83253244060b5de5eac787f61ae3f3e559d01

Patch
Kernel Git
https://git.kernel.org/stable/c/1eeedb310229bfee9dd4d992e5bba33fe1378a8f

Patch
Kernel Git
https://git.kernel.org/stable/c/2a14e91b6d76639dac70ea170f4384c1ee3cb48d

Patch
Kernel Git
https://git.kernel.org/stable/c/6ff2ebfef75fbc57d937d8fbe738b967edf2d331

Patch
Kernel Git
https://git.kernel.org/stable/c/93e01e837e105299f1c259ef71f6e1ec4fe806e3

Patch

Showing 5 of 6 references View all on NVD

Details

CVE ID CVE-2026-45865

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2026-05-27

Modified 2026-06-25

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-45865?

CVE-2026-45865 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 5.18 onward and has been patched in 6.1.165, 6.6.128, 6.12.75 and others. CVE-2026-45865 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-45865?

CVE-2026-45865 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-2026-45865?

Yes. CVE-2026-45865 has been patched. Fixed versions include 6.1.165, 6.6.128, 6.12.75 and others. If you are running Linux kernel 5.18 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-45865 actively exploited?

No. CVE-2026-45865 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.