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Vulnerability record · CVE-2026-52909 · published 19 June 2026

CVE-2026-52909: Linux kernel vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.12% · top 98.4%
7.8CVSS 3.1 base score
0.12%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
8 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/12acc977838c943636fb01e2f3087d2e4cc3b7cc Patch
https://git.kernel.org/stable/c/12c65e2c7fef507551bd7b52123598a761662c01 Patch
https://git.kernel.org/stable/c/7f28e3948c59481f8db9c9638e204258d26b4e41 Patch
https://git.kernel.org/stable/c/c5dbd669db5a426b3025512322e1bf2cdbe14305 Patch
https://git.kernel.org/stable/c/d289d5307762d1838aaece22c6b6fcad9e8865f9 Patch
https://git.kernel.org/stable/c/dcdce3bc9f08026ff3739ee7339e1bef526fc5f3 Patch
https://git.kernel.org/stable/c/ecf8904067dcba0dad86ece80874841e60317885 Patch
https://git.kernel.org/stable/c/f4b6b4af7ef0661ac153c6f7eb1030aa8482c1a3 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-52909), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.