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

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于vti6_init_net()未在per-netns回退隧道设备上设置netns_immutable标志，可能导致设备被移动到另一个网络名称空间。

CVSS 7.8 · High EPSS 0.12% · P2

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 61220ab349485d911083d0b7990ccd3db6c63297< 12acc977838c943636fb01e2f3087d2e4cc3b7cc affected
61220ab349485d911083d0b7990ccd3db6c63297< 7f28e3948c59481f8db9c9638e204258d26b4e41 affected
61220ab349485d911083d0b7990ccd3db6c63297< 12c65e2c7fef507551bd7b52123598a761662c01 affected
61220ab349485d911083d0b7990ccd3db6c63297< f4b6b4af7ef0661ac153c6f7eb1030aa8482c1a3 affected
61220ab349485d911083d0b7990ccd3db6c63297< c5dbd669db5a426b3025512322e1bf2cdbe14305 affected
61220ab349485d911083d0b7990ccd3db6c63297< ecf8904067dcba0dad86ece80874841e60317885 affected
61220ab349485d911083d0b7990ccd3db6c63297< dcdce3bc9f08026ff3739ee7339e1bef526fc5f3 affected
61220ab349485d911083d0b7990ccd3db6c63297< d289d5307762d1838aaece22c6b6fcad9e8865f9 affected
… +10 more rows
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于vti6_init_net()未在per-netns回退隧道设备上设置netns_immutable标志，可能导致设备被移动到另一个网络名称空间。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 61220ab349485d911083d0b7990ccd3db6c63297 ~ 12acc977838c943636fb01e2f3087d2e4cc3b7cc -
Linux Linux 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 (8)

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

CVE-2026-52908 7.8 HIGH RDMA: During rereg_mr ensure that REREG_ACCESS is compatible
CVE-2026-52910 7.8 HIGH bpf: Free reuseport cBPF prog after RCU grace period.

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-52909

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