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CVE-2026-43403

nsfs: tighten permission checks for ns iteration ioctls

HIGH
8.8
CVSS Score
Published: May 8, 2026 at 02:21 PM UTC
Updated: August 5, 2026 at 01:24 PM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
HIGH8.8
Exploit prediction
EPSS 0.1%

Description

In the Linux kernel, the following vulnerability has been resolved: nsfs: tighten permission checks for ns iteration ioctls 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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
95%
6.12 ≤ v < 6.12.786.12 ≤ v < 6.18.206.12 ≤ v < 6.19.96.12 ≤ v < 7.06.13 ≤ v < 6.18.206.19 ≤ v < 6.19.96.127.0 rc17.0 rc2a1d220d9dafa8d76ba60a784a1016c3134e6a1e8
Vendor states this is fixed in 0ad650e60150eda789deca5e78a6a09d26bf8fc9 (fixed)
Vendor states this is fixed in 2f3dea284c761c890d676f77d5e55c0c496b4ef4 (fixed)
Vendor states this is fixed in 3376b345df155ca36d8611857b41ff7d5183fc38 (fixed)
Vendor states this is fixed in e6b899f08066e744f89df16ceb782e06868bd148 (fixed)
Vendor states this is fixed in 6.12 (unaffected)
Vendor states this is fixed in 6.12.78 (unaffected)
Vendor states this is fixed in 6.18.20 (unaffected)
Vendor states this is fixed in 6.19.9 (unaffected)
Vendor states this is fixed in 7.0 (unaffected)

References (4)

Patch
Source: cverecord
https://git.kernel.org/stable/c/3376b345df155ca36d8611857b41ff7d5183fc38
Patch
Source: cverecord
https://git.kernel.org/stable/c/2f3dea284c761c890d676f77d5e55c0c496b4ef4
Patch
Source: cverecord
https://git.kernel.org/stable/c/0ad650e60150eda789deca5e78a6a09d26bf8fc9
Patch
Source: cverecord
https://git.kernel.org/stable/c/e6b899f08066e744f89df16ceb782e06868bd148

CVSS

8.8HIGHLinux
Vector?

Quick Info

StatusANALYZED
CWE
NVD-CWE-noinfo

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