CVE-2026-52909 (GCVE-0-2026-52909)

Vulnerability from cvelistv5 – Published: 2026-06-19 14:43 – Updated: 2026-06-19 14:43
VLAI
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 61220ab349485d911083d0b7990ccd3db6c63297 , < ecf8904067dcba0dad86ece80874841e60317885 (git)
Affected: 61220ab349485d911083d0b7990ccd3db6c63297 , < dcdce3bc9f08026ff3739ee7339e1bef526fc5f3 (git)
Affected: 61220ab349485d911083d0b7990ccd3db6c63297 , < d289d5307762d1838aaece22c6b6fcad9e8865f9 (git)
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Linux Linux Affected: 3.15
Unaffected: 0 , < 3.15 (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
            "net/ipv6/ip6_vti.c"
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            }
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              ],
              "negate": false,
              "operator": "OR"
            }
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nip6_vti: set netns_immutable on the fallback device.\n\njohn1988 and Noam Rathaus reported that vti6_init_net() does not set the\nnetns_immutable flag on the per-netns fallback tunnel device (ip6_vti0).\n\nOther similar tunnel drivers (like ip6_tunnel, sit, ip6_gre, and ip_tunnel)\ncorrectly set this flag during their fallback device initialization to\nprevent them from being moved to another network namespace."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-19T14:43:33.214Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/dcdce3bc9f08026ff3739ee7339e1bef526fc5f3"
        },
        {
          "url": "https://git.kernel.org/stable/c/d289d5307762d1838aaece22c6b6fcad9e8865f9"
        }
      ],
      "title": "ip6_vti: set netns_immutable on the fallback device.",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-52909",
    "datePublished": "2026-06-19T14:43:33.214Z",
    "dateReserved": "2026-06-09T07:44:35.366Z",
    "dateUpdated": "2026-06-19T14:43:33.214Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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