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

Vulnerability from cvelistv5 – Published: 2026-06-19 14:43 – Updated: 2026-08-05 12:31
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.
Show details on NVD website
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-52909\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-19T15:16:35.383\",\"lastModified\":\"2026-07-08T15:24:17.873\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ipv6/ip6_vti.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"61220ab349485d911083d0b7990ccd3db6c63297\",\"lessThan\":\"12acc977838c943636fb01e2f3087d2e4cc3b7cc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"61220ab349485d911083d0b7990ccd3db6c63297\",\"lessThan\":\"7f28e3948c59481f8db9c9638e204258d26b4e41\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"61220ab349485d911083d0b7990ccd3db6c63297\",\"lessThan\":\"12c65e2c7fef507551bd7b52123598a761662c01\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"61220ab349485d911083d0b7990ccd3db6c63297\",\"lessThan\":\"f4b6b4af7ef0661ac153c6f7eb1030aa8482c1a3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"61220ab349485d911083d0b7990ccd3db6c63297\",\"lessThan\":\"c5dbd669db5a426b3025512322e1bf2cdbe14305\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"61220ab349485d911083d0b7990ccd3db6c63297\",\"lessThan\":\"ecf8904067dcba0dad86ece80874841e60317885\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"61220ab349485d911083d0b7990ccd3db6c63297\",\"lessThan\":\"dcdce3bc9f08026ff3739ee7339e1bef526fc5f3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"61220ab349485d911083d0b7990ccd3db6c63297\",\"lessThan\":\"d289d5307762d1838aaece22c6b6fcad9e8865f9\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ipv6/ip6_vti.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.15\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.15\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.260\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.211\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.177\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.144\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.95\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.36\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.13\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.15\",\"versionEndExcluding\":\"5.10.260\",\"matchCriteriaId\":\"A607EC6A-B5CC-42BB-B74C-7191E7210452\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.211\",\"matchCriteriaId\":\"D71C101E-388C-4A46-BD99-49049F7C5CFF\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.177\",\"matchCriteriaId\":\"333C9E30-7FD4-46A2-94EF-C1AA1F3EE28B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.144\",\"matchCriteriaId\":\"C8AD3BC8-C843-423C-B9DB-CB52F67F578E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.95\",\"matchCriteriaId\":\"4E206B86-E0E3-4394-A93F-39F2D50A8AA8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.36\",\"matchCriteriaId\":\"389025D2-958D-41BD-BD96-70ED1033A9F3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "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": "2026-07-28T23:38:57Z",
      "cve": "CVE-2026-52909",
      "id": "CVE-2026-52909",
      "initial_release_date": "2026-06-23T02:20:10Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "468",
      "product_status:known_not_affected": "36",
      "product_status:recommended": "661",
      "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": "22"
    }
  }
}



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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.