What is CVE-2026-100074?

CVE-2026-100074 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 6.4 onward and patched in 6.18.52, 7.2.6 and 7.3-rc1. CVE-2026-100074 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-100074?

CVE-2026-100074 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-2026-100074?

Yes, CVE-2026-100074 has been patched. Fixed versions include 6.18.52, 7.2.6 and 7.3-rc1. If you are running Linux kernel 6.4 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-100074 actively exploited?

CVE-2026-100074 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-100074

Medium

In the Linux kernel, the following vulnerability has been resolved: bpf: Mark bpf_refcount field as unique BPF_REFCOUNT is not marked as a unique field, while it should be. Fix this oversight.

Package Linux Kernel

Published 2026-09-25

Last modified 2026-10-02

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 6.4 and later are affected. Fixed in 6.18.52, 7.2.6, 7.3-rc1 and their respective stable series.

Affected from

≥ 6.4

Fixed in

✓ 6.18.52 6.18.x ✓ 7.2.6 7.2.x ✓ 7.3-rc1

References

3 total

Kernel Git
https://git.kernel.org/stable/c/61e655391cb19c31f94ecd4354f624c81ce4cf75

Patch
Kernel Git
https://git.kernel.org/stable/c/641f814965d733936ca3618d4d5a12a8fa9be00e

Patch
Kernel Git
https://git.kernel.org/stable/c/e42cede6f90177f4f92f80d3de18f628e61d2087

Patch

Details

CVE ID CVE-2026-100074

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2026-09-25

Modified 2026-10-02

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-100074?

CVE-2026-100074 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 6.4 onward and has been patched in 6.18.52, 7.2.6 and 7.3-rc1. CVE-2026-100074 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-100074?

CVE-2026-100074 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-2026-100074?

Yes. CVE-2026-100074 has been patched. Fixed versions include 6.18.52, 7.2.6 and 7.3-rc1. If you are running Linux kernel 6.4 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-100074 actively exploited?

No. CVE-2026-100074 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.