{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-52909","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-06-09T07:44:35.366Z","datePublished":"2026-06-19T14:43:33.214Z","dateUpdated":"2026-07-04T11:50:46.147Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-07-04T11:50:46.147Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nip6_vti: set netns_immutable on the fallback device.\n\njohn1988 and Noam Rathaus reported that vti6_init_net() does not set the\nnetns_immutable flag on the per-netns fallback tunnel device (ip6_vti0).\n\nOther similar tunnel drivers (like ip6_tunnel, sit, ip6_gre, and ip_tunnel)\ncorrectly set this flag during their fallback device initialization to\nprevent them from being moved to another network namespace."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"}}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv6/ip6_vti.c"],"versions":[{"version":"61220ab349485d911083d0b7990ccd3db6c63297","lessThan":"12acc977838c943636fb01e2f3087d2e4cc3b7cc","status":"affected","versionType":"git"},{"version":"61220ab349485d911083d0b7990ccd3db6c63297","lessThan":"7f28e3948c59481f8db9c9638e204258d26b4e41","status":"affected","versionType":"git"},{"version":"61220ab349485d911083d0b7990ccd3db6c63297","lessThan":"12c65e2c7fef507551bd7b52123598a761662c01","status":"affected","versionType":"git"},{"version":"61220ab349485d911083d0b7990ccd3db6c63297","lessThan":"f4b6b4af7ef0661ac153c6f7eb1030aa8482c1a3","status":"affected","versionType":"git"},{"version":"61220ab349485d911083d0b7990ccd3db6c63297","lessThan":"c5dbd669db5a426b3025512322e1bf2cdbe14305","status":"affected","versionType":"git"},{"version":"61220ab349485d911083d0b7990ccd3db6c63297","lessThan":"ecf8904067dcba0dad86ece80874841e60317885","status":"affected","versionType":"git"},{"version":"61220ab349485d911083d0b7990ccd3db6c63297","lessThan":"dcdce3bc9f08026ff3739ee7339e1bef526fc5f3","status":"affected","versionType":"git"},{"version":"61220ab349485d911083d0b7990ccd3db6c63297","lessThan":"d289d5307762d1838aaece22c6b6fcad9e8865f9","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/ipv6/ip6_vti.c"],"versions":[{"version":"3.15","status":"affected"},{"version":"0","lessThan":"3.15","status":"unaffected","versionType":"semver"},{"version":"5.10.260","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.211","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.177","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.144","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.95","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.36","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.0.13","lessThanOrEqual":"7.0.*","status":"unaffected","versionType":"semver"},{"version":"7.1","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":"3.15","versionEndExcluding":"5.10.260"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"5.15.211"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"6.1.177"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"6.6.144"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"6.12.95"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"6.18.36"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"7.0.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"7.1"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/12acc977838c943636fb01e2f3087d2e4cc3b7cc"},{"url":"https://git.kernel.org/stable/c/7f28e3948c59481f8db9c9638e204258d26b4e41"},{"url":"https://git.kernel.org/stable/c/12c65e2c7fef507551bd7b52123598a761662c01"},{"url":"https://git.kernel.org/stable/c/f4b6b4af7ef0661ac153c6f7eb1030aa8482c1a3"},{"url":"https://git.kernel.org/stable/c/c5dbd669db5a426b3025512322e1bf2cdbe14305"},{"url":"https://git.kernel.org/stable/c/ecf8904067dcba0dad86ece80874841e60317885"},{"url":"https://git.kernel.org/stable/c/dcdce3bc9f08026ff3739ee7339e1bef526fc5f3"},{"url":"https://git.kernel.org/stable/c/d289d5307762d1838aaece22c6b6fcad9e8865f9"}],"title":"ip6_vti: set netns_immutable on the fallback device.","x_generator":{"engine":"bippy-1.2.0"}}}}