HighFix available
ip6_vti: set netns_immutable on the fallback device.
Type: advisorySources: OSV
In the Linux kernel, the following vulnerability has been resolved: ip6_vti: set netns_immutable on the fallback device. john1988 and Noam Rathaus reported that vti6_init_net() does not set the netns_immutable flag on the per-netns fallback tunnel device (ip6_vti0). Other similar tunnel drivers (like ip6_tunnel, sit, ip6_gre, and ip_tunnel) correctly set this flag during their fallback device initialization to prevent them from being moved to another network namespace.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.260, 5.15.211, 6.1.177, 6.12.95, 6.18.36, 6.6.144, 7.0.13
- CVEs
- CVE-2026-52909
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 7 Nov 2026, 03:10 UTC · Revision 1
Source evidence
ip6_vti: set netns_immutable on the fallback device.
core-osv · Original sourcePublished 19 Jun 2026, 14:43 UTC
In the Linux kernel, the following vulnerability has been resolved: ip6_vti: set netns_immutable on the fallback device. john1988 and Noam Rathaus reported that vti6_init_net() does not set the netns_immutable flag on the per-netns fallback tunnel device (ip6_vti0). Other similar tunnel drivers (like ip6_tunnel, sit, ip6_gre, and ip_tunnel) correctly set this flag during their fallback device initialization to prevent them from being moved to another network namespace.
osv:CVE-2026-52909
Kernel
Fixed versions: 5.10.260, 5.15.211, 6.1.177, 6.6.144, 6.12.95, 6.18.36, 7.0.13
Complete source record
{
"id": "77b3be248eb5a5191f65f2e6bad286bff8b92786ecc937cb7e674c73bdeba241",
"url": "https://osv.dev/vulnerability/CVE-2026-52909",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "ip6_vti: set netns_immutable on the fallback device.",
"summary": "In the Linux kernel, the following vulnerability has been resolved: ip6_vti: set netns_immutable on the fallback device. john1988 and Noam Rathaus reported that vti6_init_net() does not set the netns_immutable flag on the per-netns fallback tunnel device (ip6_vti0). Other similar tunnel drivers (like ip6_tunnel, sit, ip6_gre, and ip_tunnel) correctly set this flag during their fallback device initialization to prevent them from being moved to another network namespace.",
"evidence": "osv:CVE-2026-52909",
"products": [
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"evidence": "/affected/1/ranges"
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{
"value": "5.15.211",
"evidence": "/affected/1/ranges"
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{
"value": "6.1.177",
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{
"value": "6.6.144",
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{
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{
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"severity": "high",
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"aliases": [
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"metrics": [
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"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
}
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"affected": [
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{
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{
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{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.13.0"
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{
"fixed": "6.18.36"
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]
},
{
"type": "ECOSYSTEM",
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"package": {
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"modified": "2026-10-28T02:30:49.233518429Z",
"provider": "osv",
"references": [
"https://cert-portal.siemens.com/productcert/html/ssa-784472.html",
"https://git.kernel.org/stable/c/12acc977838c943636fb01e2f3087d2e4cc3b7cc",
"https://git.kernel.org/stable/c/12c65e2c7fef507551bd7b52123598a761662c01",
"https://git.kernel.org/stable/c/7f28e3948c59481f8db9c9638e204258d26b4e41",
"https://git.kernel.org/stable/c/c5dbd669db5a426b3025512322e1bf2cdbe14305",
"https://git.kernel.org/stable/c/d289d5307762d1838aaece22c6b6fcad9e8865f9",
"https://git.kernel.org/stable/c/dcdce3bc9f08026ff3739ee7339e1bef526fc5f3",
"https://git.kernel.org/stable/c/ecf8904067dcba0dad86ece80874841e60317885",
"https://git.kernel.org/stable/c/f4b6b4af7ef0661ac153c6f7eb1030aa8482c1a3",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52909.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-52909",
"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
],
"provider_metadata": {
"cna_assigner": "Linux",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52909.json"
}
},
"related_cves": [
{
"value": "CVE-2026-52909",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 517643,
"published_at": "2026-06-19T14:43:33.214+00:00"
}