{"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": "2026-08-05T12:31:32.616Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:31:32.616Z"}, "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"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable operation is reached through local rtnetlink device movement, such as RTM_SETLINK with IFLA_NET_NS_FD, not by unauthenticated remote packets.\nAC:L - An attacker can deterministically create or use network namespaces and move ip6_vti0; no race, special timing, or external condition is required.\nPR:L - The path requires CAP_NET_ADMIN in the relevant network namespace, but that is reachable from an unprivileged user via user namespaces on common deployments.\nUI:N - No victim action is required once the attacker can issue the local netlink operation.\nS:U - The impact remains within the kernel/network-namespace security authority and does not cross a VM, IOMMU, or separate hardware-enforced boundary.\nC:H - Moving the singleton fallback device leaves vti6 per-netns tunnel state pointing at a device in another namespace, which can expose VTI/XFRM tunnel traffic or namespace-scoped network state through an attacker-controlled device.\nI:H - The same cross-namespace device/state mismatch can let the attacker redirect or manipulate VTI6 tunnel delivery and per-netns tunnel semantics, so high integrity impact is defensible.\nA:H - The fallback device is assumed to be one immutable device per netns; violating that invariant can unregister or corrupt tunnel state and related vti6 namespace-migration bugs have produced cleanup-time UAF/BUG conditions."}]}], "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"}}}}

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{"bugzilla": {"description": "kernel: ip6_vti: set netns_immutable on the fallback device", "id": "2490789", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2490789"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-1188", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nip6_vti: set netns_immutable on the fallback device.\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).\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.", "A flaw was found in the Linux kernel, specifically within the IPv6 Virtual Tunnel Interface (ip6_vti) component. This vulnerability occurs because a critical flag, netns_immutable, is not properly set on a specific network device (ip6_vti0) when it is initialized. This oversight could allow the device to be moved between different network environments (network namespaces) within the system. Such unauthorized movement might lead to unexpected network configurations or potential security issues."], "name": "CVE-2026-52909", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-06-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-52909\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-52909\nhttps://lore.kernel.org/linux-cve-announce/2026061933-CVE-2026-52909-253f@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[61220ab349485d911083d0b7990ccd3db6c63297,ecf8904067dcba0dad86ece80874841e60317885)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[61220ab349485d911083d0b7990ccd3db6c63297,dcdce3bc9f08026ff3739ee7339e1bef526fc5f3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[61220ab349485d911083d0b7990ccd3db6c63297,d289d5307762d1838aaece22c6b6fcad9e8865f9)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "3.15"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.15)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.36,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.13,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-06-19T20:45:03.531507+00:00", "updated": "2026-06-28T14:00:21.101023+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}