{"id":"CVE-2026-43391","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nnsfs: tighten permission checks for handle opening\n\nEven privileged services should not necessarily be able to see other\nprivileged service's namespaces so they can't l…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnsfs: tighten permission checks for handle opening\n\nEven privileged services should not necessarily be able to see other\nprivileged service's namespaces so they can't l…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 6.18, < 6.19.9","linux_kernel = 7.0"],"patched":["linux_kernel 6.19.9"],"published":"2026-05-08","updated":"2026-09-07","sourceUpdated":"2026-09-07T16:17:28.400","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-43391","references":[{"url":"https://git.kernel.org/stable/c/1797ee11451f1b2be69863a9f5bd43b948813fdf","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/24ebaf6676ae4f74f4856eb645959b15e62bc1b4","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d2324a9317f00013facb0ba00b00440e19d2af5e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00128,"epssPercentile":0.02778,"ingestedAt":"2026-09-07T17:14:51.618Z","slug":"CVE-2026-43391","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnsfs: tighten permission checks for handle opening\n\nEven privileged services should not necessarily be able to see other\nprivileged service's namespaces so they can't leak information to each\nother. Use may_see_all_namespaces() helper that centralizes this policy\nuntil the nstree adapts.\n\n## Affected\n\n- `linux_kernel >= 6.18, < 6.19.9`\n- `linux_kernel = 7.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.19.9`","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}