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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 3.15, < 5.10.260 |
References
- https://git.kernel.org/stable/c/12acc977838c943636fb01e2f3087d2e4cc3b7ccPatch
- https://git.kernel.org/stable/c/12c65e2c7fef507551bd7b52123598a761662c01Patch
- https://git.kernel.org/stable/c/7f28e3948c59481f8db9c9638e204258d26b4e41Patch
- https://git.kernel.org/stable/c/c5dbd669db5a426b3025512322e1bf2cdbe14305Patch
- https://git.kernel.org/stable/c/d289d5307762d1838aaece22c6b6fcad9e8865f9Patch
- https://git.kernel.org/stable/c/dcdce3bc9f08026ff3739ee7339e1bef526fc5f3Patch
- https://git.kernel.org/stable/c/ecf8904067dcba0dad86ece80874841e60317885Patch
- https://git.kernel.org/stable/c/f4b6b4af7ef0661ac153c6f7eb1030aa8482c1a3Patch
FAQ
What is CVE-2026-52909?
CVE-2026-52909 is a vulnerability with a CVSS score of 7.8 (HIGH). 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 netn...
How severe is CVE-2026-52909?
CVE-2026-52909 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-52909?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.