{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43403","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-05-01T14:12:56.007Z","datePublished":"2026-05-08T14:21:44.204Z","dateUpdated":"2026-05-11T22:23:54.491Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T22:23:54.491Z"},"descriptions":[{"lang":"en","value":"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."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH"}}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/nsfs.c","include/linux/ns_common.h","kernel/nscommon.c"],"versions":[{"version":"a1d220d9dafa8d76ba60a784a1016c3134e6a1e8","lessThan":"3376b345df155ca36d8611857b41ff7d5183fc38","status":"affected","versionType":"git"},{"version":"a1d220d9dafa8d76ba60a784a1016c3134e6a1e8","lessThan":"2f3dea284c761c890d676f77d5e55c0c496b4ef4","status":"affected","versionType":"git"},{"version":"a1d220d9dafa8d76ba60a784a1016c3134e6a1e8","lessThan":"0ad650e60150eda789deca5e78a6a09d26bf8fc9","status":"affected","versionType":"git"},{"version":"a1d220d9dafa8d76ba60a784a1016c3134e6a1e8","lessThan":"e6b899f08066e744f89df16ceb782e06868bd148","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/nsfs.c","include/linux/ns_common.h","kernel/nscommon.c"],"versions":[{"version":"6.12","status":"affected"},{"version":"0","lessThan":"6.12","status":"unaffected","versionType":"semver"},{"version":"6.12.78","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.20","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19.9","lessThanOrEqual":"6.19.*","status":"unaffected","versionType":"semver"},{"version":"7.0","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"6.12.78"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"6.18.20"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"6.19.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"7.0"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/3376b345df155ca36d8611857b41ff7d5183fc38"},{"url":"https://git.kernel.org/stable/c/2f3dea284c761c890d676f77d5e55c0c496b4ef4"},{"url":"https://git.kernel.org/stable/c/0ad650e60150eda789deca5e78a6a09d26bf8fc9"},{"url":"https://git.kernel.org/stable/c/e6b899f08066e744f89df16ceb782e06868bd148"}],"title":"nsfs: tighten permission checks for ns iteration ioctls","x_generator":{"engine":"bippy-1.2.0"}}}}