CVE-2026-43403 Details
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.
A vulnerability in the Linux kernel's namespace file system (nsfs) has been addressed by tightening permission checks for namespace iteration ioctls. Previously, even privileged services could access other privileged services' namespaces, potentially leading to information leaks. The vulnerability has been fixed by implementing a centralized policy that restricts namespace visibility, ensuring that services cannot inadvertently disclose sensitive information to one another.
Users can upgrade to the latest version of the Linux kernel where this vulnerability has been addressed. Instructions for downloading the patched version are available on the Linux kernel official website.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/0ad650e60150eda789deca5e78a6a09d26bf8fc9 | kernel.org | Patch |
| https://git.kernel.org/stable/c/2f3dea284c761c890d676f77d5e55c0c496b4ef4 | kernel.org | Patch |
| https://git.kernel.org/stable/c/3376b345df155ca36d8611857b41ff7d5183fc38 | kernel.org | Patch |
| https://git.kernel.org/stable/c/e6b899f08066e744f89df16ceb782e06868bd148 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.12, < 6.12.78 >= 6.13, < 6.18.20 >= 6.19, < 6.19.9 7.0 rc1 7.0 rc2 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| May 21, 2026 | Initial Analysis | [email protected] |
| May 11, 2026 | CVE Modified | kernel.org |
| May 8, 2026 | New CVE Received | kernel.org |