What is CVE-2026-43391?

CVE-2026-43391 is a high-severity vulnerability in Linux. CVSS score: 8.8/10. Published 2026-05-08.

How severe is CVE-2026-43391?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Linux

CVE-2026-43391

In the Linux kernel, the following vulnerability has been resolved: nsfs: tighten permission checks for handle opening Even privileged services should not necessarily be able to see other privileged service's namespaces so they can't lea…

EPSS: 0.000 (3.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

Affected products

Linux — versions 5222470b2fbb3740f931f189db33dd1367b1ae75, 6.18, 0
Linux Linux_kernel — versions 7.0

References

416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)

Frequently asked questions

What is CVE-2026-43391?: CVE-2026-43391 is a high-severity vulnerability in Linux. CVSS score: 8.8/10. Published 2026-05-08.
How severe is CVE-2026-43391?: High severity. CVSS v3 base score is 8.8 out of 10.