CVE-2026-43391

CVE-2026-43391

High · published May 8, 2026

CVSS v3.1
8.8
EPSS
0%
Percentile
6.4
In the wild
Unconfirmed
What it is

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 leak information to each

other. Use may_see_all_namespaces() helper that centralizes this policy

until the nstree adapts.

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00173 · 6.4th percentile
Published
2026-05-08T19:16Z
Affected products (3)
ProductVersionsFixed in
linux/linux_kernel≥ 6.18, < 6.19.96.19.9
linux/linux_kernelall versions—
linux/linux_kernelall versions—
References (3)
https://git.kernel.org/stable/c/1797ee11451f1b2be69863a9f5bd43b948813fdf · 416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/24ebaf6676ae4f74f4856eb645959b15e62bc1b4 · 416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d2324a9317f00013facb0ba00b00440e19d2af5e · 416baaa9-dc9f-4396-8d5f-8c081fb06d67
EPSS history
Timeline
  • 08 MAY 14:21Z
    nsfs: tighten permission checks for handle opening
    cvelistv5