High 8.8Published May 8, 2026

CVE-2026-43403nsfs: tighten permission checks for ns iteration ioctls

Updated under an hour ago (Oct 27, 2026, 12:30 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Aug 5, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from a1d220d9dafa8d76ba60a784a1016c3134e6a1e8 before 3376b345df155ca36d8611857b41ff7d5183fc38; from a1d220d9dafa8d76ba60a784a1016c3134e6a1e8 before 2f3dea284c761c890d676f77d5e55c0c496b4ef4; from a1d220d9dafa8d76ba60a784a1016c3134e6a1e8 before 0ad650e60150eda789deca5e78a6a09d26bf8fc9; from a1d220d9dafa8d76ba60a784a1016c3134e6a1e8 before e6b899f08066e744f89df16ceb782e06868bd148	CNA record
linux linux_kernel linux:linux_kernel	from 6.12 before 6.12.78; from 6.13 before 6.18.20; from 6.19 before 6.19.9; 7.0; 7.0	NVD

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.