{"id":"CVE-2026-43390","state":"PUBLISHED","title":"nstree: tighten permission checks for listing","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnstree: tighten permission checks for listing\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.","publishedAt":"2026-05-08T14:21:35.337Z","updatedAt":"2026-05-11T22:23:39.579Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"76b6f5dfb3fda76fce1f9990d6fa58adc711122b","status":"affected","lessThan":"0abd81645fc95ec6a9d4e4813000f22c5efc0ff4","versionType":"git"},{"version":"76b6f5dfb3fda76fce1f9990d6fa58adc711122b","status":"affected","lessThan":"8d76afe84fa2babf604b3c173730d4d2b067e361","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/nstree.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.19","versionType":"semver"},{"version":"6.19.9","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/nstree.c"]}],"references":["https://git.kernel.org/stable/c/0abd81645fc95ec6a9d4e4813000f22c5efc0ff4","https://git.kernel.org/stable/c/8d76afe84fa2babf604b3c173730d4d2b067e361"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/43xxx/CVE-2026-43390.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43390","state":"PUBLISHED","datePublished":"2026-05-08T14:21:35.337Z","dateUpdated":"2026-05-11T22:23:39.579Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-01T14:12:56.007Z"},"containers":{"cna":{"title":"nstree: tighten permission checks for listing","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnstree: tighten permission checks for listing\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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"76b6f5dfb3fda76fce1f9990d6fa58adc711122b","status":"affected","lessThan":"0abd81645fc95ec6a9d4e4813000f22c5efc0ff4","versionType":"git"},{"version":"76b6f5dfb3fda76fce1f9990d6fa58adc711122b","status":"affected","lessThan":"8d76afe84fa2babf604b3c173730d4d2b067e361","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/nstree.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.19","versionType":"semver"},{"version":"6.19.9","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["kernel/nstree.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/0abd81645fc95ec6a9d4e4813000f22c5efc0ff4"},{"url":"https://git.kernel.org/stable/c/8d76afe84fa2babf604b3c173730d4d2b067e361"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T22:23:39.579Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19","versionEndExcluding":"6.19.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}