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

Vulnerability from cvelistv5 – Published: 2026-06-19 14:43 – Updated: 2026-07-04 11:50
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
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 61220ab349485d911083d0b7990ccd3db6c63297 , < 12acc977838c943636fb01e2f3087d2e4cc3b7cc (git)
Affected: 61220ab349485d911083d0b7990ccd3db6c63297 , < 7f28e3948c59481f8db9c9638e204258d26b4e41 (git)
Affected: 61220ab349485d911083d0b7990ccd3db6c63297 , < 12c65e2c7fef507551bd7b52123598a761662c01 (git)
Affected: 61220ab349485d911083d0b7990ccd3db6c63297 , < f4b6b4af7ef0661ac153c6f7eb1030aa8482c1a3 (git)
Affected: 61220ab349485d911083d0b7990ccd3db6c63297 , < c5dbd669db5a426b3025512322e1bf2cdbe14305 (git)
Affected: 61220ab349485d911083d0b7990ccd3db6c63297 , < ecf8904067dcba0dad86ece80874841e60317885 (git)
Affected: 61220ab349485d911083d0b7990ccd3db6c63297 , < dcdce3bc9f08026ff3739ee7339e1bef526fc5f3 (git)
Affected: 61220ab349485d911083d0b7990ccd3db6c63297 , < d289d5307762d1838aaece22c6b6fcad9e8865f9 (git)
Create a notification for this product.
Linux Linux Affected: 3.15
Unaffected: 0 , < 3.15 (semver)
Unaffected: 5.10.260 , ≤ 5.10.* (semver)
Unaffected: 5.15.211 , ≤ 5.15.* (semver)
Unaffected: 6.1.177 , ≤ 6.1.* (semver)
Unaffected: 6.6.144 , ≤ 6.6.* (semver)
Unaffected: 6.12.95 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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    "redhat_vex": {
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      "current_release_date": "2026-07-04T13:04:33+00:00",
      "cve": "CVE-2026-52909",
      "id": "CVE-2026-52909",
      "initial_release_date": "2026-06-19T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ip6_vti: set netns_immutable on the fallback device",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52909.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-07-21T23:52:47Z",
      "cve": "CVE-2026-52909",
      "id": "CVE-2026-52909",
      "initial_release_date": "2026-06-23T02:20:10Z",
      "product_status:first_fixed": "127",
      "product_status:known_affected": "74",
      "product_status:known_not_affected": "34",
      "product_status:recommended": "422",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-52909",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-52909.json",
      "version": "15"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.