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CVE-2026-52909— ip6_vti: set netns_immutable on the fallback device.

AI Predicted 5.5 Difficulty: Moderate

Affected Version Matrix 8

VendorProductVersion RangeStatus
LinuxLinux61220ab349485d911083d0b7990ccd3db6c63297< ecf8904067dcba0dad86ece80874841e60317885affected
61220ab349485d911083d0b7990ccd3db6c63297< dcdce3bc9f08026ff3739ee7339e1bef526fc5f3affected
61220ab349485d911083d0b7990ccd3db6c63297< d289d5307762d1838aaece22c6b6fcad9e8865f9affected
3.15affected
< 3.15unaffected
6.18.36≤ 6.18.*unaffected
7.0.13≤ 7.0.*unaffected
7.1≤ *unaffected
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I. Basic Information for CVE-2026-52909

Vulnerability Information
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Vulnerability Title
ip6_vti: set netns_immutable on the fallback device.
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux 61220ab349485d911083d0b7990ccd3db6c63297 ~ ecf8904067dcba0dad86ece80874841e60317885 -
LinuxLinux 3.15 -

II. Public POCs for CVE-2026-52909

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III. Intelligence Information for CVE-2026-52909

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Patches & Fixes for CVE-2026-52909 (3)

Same Patch Batch · Linux · 2026-06-19 · 3 CVEs total

CVE-2026-52910bpf: Free reuseport cBPF prog after RCU grace period.
CVE-2026-52908RDMA: During rereg_mr ensure that REREG_ACCESS is compatible

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-52909

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