CVE-2026-52909 (GCVE-0-2026-52909)
Vulnerability from cvelistv5
Published
2026-06-19 14:43
Modified
2026-08-05 12:31
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 61220ab349485d911083d0b7990ccd3db6c63297
Version: 61220ab349485d911083d0b7990ccd3db6c63297
Version: 61220ab349485d911083d0b7990ccd3db6c63297
Version: 61220ab349485d911083d0b7990ccd3db6c63297
Version: 61220ab349485d911083d0b7990ccd3db6c63297
Version: 61220ab349485d911083d0b7990ccd3db6c63297
Version: 61220ab349485d911083d0b7990ccd3db6c63297
Version: 61220ab349485d911083d0b7990ccd3db6c63297
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{
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          "product": "Linux",
          "programFiles": [
            "net/ipv6/ip6_vti.c"
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              "versionType": "original_commit_for_fix"
            }
          ]
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      ],
      "cpeApplicability": [
        {
          "nodes": [
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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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable operation is reached through local rtnetlink device movement, such as RTM_SETLINK with IFLA_NET_NS_FD, not by unauthenticated remote packets.\nAC:L - An attacker can deterministically create or use network namespaces and move ip6_vti0; no race, special timing, or external condition is required.\nPR:L - The path requires CAP_NET_ADMIN in the relevant network namespace, but that is reachable from an unprivileged user via user namespaces on common deployments.\nUI:N - No victim action is required once the attacker can issue the local netlink operation.\nS:U - The impact remains within the kernel/network-namespace security authority and does not cross a VM, IOMMU, or separate hardware-enforced boundary.\nC:H - Moving the singleton fallback device leaves vti6 per-netns tunnel state pointing at a device in another namespace, which can expose VTI/XFRM tunnel traffic or namespace-scoped network state through an attacker-controlled device.\nI:H - The same cross-namespace device/state mismatch can let the attacker redirect or manipulate VTI6 tunnel delivery and per-netns tunnel semantics, so high integrity impact is defensible.\nA:H - The fallback device is assumed to be one immutable device per netns; violating that invariant can unregister or corrupt tunnel state and related vti6 namespace-migration bugs have produced cleanup-time UAF/BUG conditions."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:31:32.616Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/12acc977838c943636fb01e2f3087d2e4cc3b7cc"
        },
        {
          "url": "https://git.kernel.org/stable/c/7f28e3948c59481f8db9c9638e204258d26b4e41"
        },
        {
          "url": "https://git.kernel.org/stable/c/12c65e2c7fef507551bd7b52123598a761662c01"
        },
        {
          "url": "https://git.kernel.org/stable/c/f4b6b4af7ef0661ac153c6f7eb1030aa8482c1a3"
        },
        {
          "url": "https://git.kernel.org/stable/c/c5dbd669db5a426b3025512322e1bf2cdbe14305"
        },
        {
          "url": "https://git.kernel.org/stable/c/ecf8904067dcba0dad86ece80874841e60317885"
        },
        {
          "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.",
      "x_generator": {
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      }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-52909",
    "datePublished": "2026-06-19T14:43:33.214Z",
    "dateReserved": "2026-06-09T07:44:35.366Z",
    "dateUpdated": "2026-08-05T12:31:32.616Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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