CVE•Published 2026-05-08•Modified 2026-05-21•1 article on news•6 live references•NVD data
CVE-2026-43403Linux · Linux_kernel
Vulnerability data via NVD (ingested)
CVSS v3.1
8.8
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS percentile
—
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.
Timeline
Published 2026-05-08
Modified 2026-05-21
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag0 hosts
vuln:CVE-2026-43403Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · OS
os:"Linux Kernel"Hosts Shodan identified as running Linux Kernel.
More intel sources (5)
Shodan report
vuln:CVE-2026-43403Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-43403Censys host search filtered to this CVE id.
grep.app
CVE-2026-43403Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-43403GitHub code search for direct mentions.
Google dork
"CVE-2026-43403" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2026-43403 on GitHub.