{"id":"CVE-2026-43403","summary":"nsfs: tighten permission checks for ns iteration ioctls","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnsfs: tighten permission checks for ns iteration ioctls\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.","modified":"2026-07-15T01:49:19.331044855Z","published":"2026-05-08T14:21:44.204Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43403.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0ad650e60150eda789deca5e78a6a09d26bf8fc9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2f3dea284c761c890d676f77d5e55c0c496b4ef4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3376b345df155ca36d8611857b41ff7d5183fc38"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e6b899f08066e744f89df16ceb782e06868bd148"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43403.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43403"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"a1d220d9dafa8d76ba60a784a1016c3134e6a1e8"},{"fixed":"3376b345df155ca36d8611857b41ff7d5183fc38"},{"fixed":"2f3dea284c761c890d676f77d5e55c0c496b4ef4"},{"fixed":"0ad650e60150eda789deca5e78a6a09d26bf8fc9"},{"fixed":"e6b899f08066e744f89df16ceb782e06868bd148"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43403.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.12.0"},{"fixed":"6.12.78"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.20"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.9"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43403.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"}]}