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CVE-2026-63917 (GCVE-0-2026-63917)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:55 – Updated: 2026-08-05 12:37
VLAI
Title
ip6: vti: Use ip6_tnl.net in vti6_changelink().
Summary
In the Linux kernel, the following vulnerability has been resolved: ip6: vti: Use ip6_tnl.net in vti6_changelink(). ip netns add ns1 ip netns add ns2 ip -n ns1 link add vti6_test type vti6 remote ::1 local ::2 key 7 ip -n ns1 link set vti6_test netns ns2 ip -n ns2 link set vti6_test type vti6 remote ::3 local ::4 key 9 ip netns del ns2 ip netns del ns1 [ 132.495484] ------------[ cut here ]------------ [ 132.497609] kernel BUG at net/core/dev.c:12376! Commit 61220ab34948 ("vti6: Enable namespace changing") dropped NETIF_F_NETNS_LOCAL from vti6 devices. A vti6 tunnel can then move through IFLA_NET_NS_FD. After the move dev_net(dev) points at the new netns while t->net stays at the creation netns. vti6_changelink() and vti6_update() still use dev_net(dev) and dev_net(t->dev). They unlink from one per netns hash and relink into another. The creation netns is left with a stale entry. cleanup_net() of that netns later walks freed memory. Reachable from an unprivileged user namespace (unshare --user --map-root-user --net). Cross tenant scope on container hosts.
Severity
8.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 61220ab349485d911083d0b7990ccd3db6c63297 , < 0cdce7618464f7fb06f461e8f4ad575cb1d570f4 (git)
Affected: 61220ab349485d911083d0b7990ccd3db6c63297 , < f5c68875e25f331e497ddfbe81e2d8163a87f136 (git)
Affected: 61220ab349485d911083d0b7990ccd3db6c63297 , < d9c5eecdb3c740e65038651db7c686b10d76d1bc (git)
Affected: 61220ab349485d911083d0b7990ccd3db6c63297 , < f1e89a943ee574d0f2f16246eb3f2d7330fdeb03 (git)
Affected: 61220ab349485d911083d0b7990ccd3db6c63297 , < 225b467e3b631f38be22e4b38062a1fed02fdd21 (git)
Affected: 61220ab349485d911083d0b7990ccd3db6c63297 , < fc32be9ac2788524c6b24efd681cce7a6e731a92 (git)
Affected: 61220ab349485d911083d0b7990ccd3db6c63297 , < ee1778ba0f5cb53be771f97017d01eb356c797bf (git)
Affected: 61220ab349485d911083d0b7990ccd3db6c63297 , < 11b326fb0a374f4654f9be22d0f0f7abd9f7d3fe (git)
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Linux Linux Affected: 3.15
Unaffected: 0 , < 3.15 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.93 , ≤ 6.12.* (semver)
Unaffected: 6.18.35 , ≤ 6.18.* (semver)
Unaffected: 7.0.12 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nip6: vti: Use ip6_tnl.net in vti6_changelink().\n\nip netns add ns1\nip netns add ns2\nip -n ns1 link add vti6_test type vti6 remote ::1 local ::2 key 7\nip -n ns1 link set vti6_test netns ns2\nip -n ns2 link set vti6_test type vti6 remote ::3 local ::4 key 9\nip netns del ns2\nip netns del ns1\n[  132.495484] ------------[ cut here ]------------\n[  132.497609] kernel BUG at net/core/dev.c:12376!\n\nCommit 61220ab34948 (\"vti6: Enable namespace changing\") dropped\nNETIF_F_NETNS_LOCAL from vti6 devices. A vti6 tunnel can then\nmove through IFLA_NET_NS_FD. After the move dev_net(dev) points\nat the new netns while t-\u003enet stays at the creation netns.\n\nvti6_changelink() and vti6_update() still use dev_net(dev) and\ndev_net(t-\u003edev). They unlink from one per netns hash and relink\ninto another. The creation netns is left with a stale entry.\ncleanup_net() of that netns later walks freed memory.\n\nReachable from an unprivileged user namespace (unshare --user\n--map-root-user --net). Cross tenant scope on container hosts."
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    "dateReserved": "2026-07-19T07:54:57.020Z",
    "dateUpdated": "2026-08-05T12:37:11.588Z",
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After the move dev_net(dev) points\\nat the new netns while t-\u003enet stays at the creation netns.\\n\\nvti6_changelink() and vti6_update() still use dev_net(dev) and\\ndev_net(t-\u003edev). They unlink from one per netns hash and relink\\ninto another. The creation netns is left with a stale entry.\\ncleanup_net() of that netns later walks freed memory.\\n\\nReachable from an unprivileged user namespace (unshare --user\\n--map-root-user --net). Cross tenant scope on container hosts.\"}],\"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\":\"0cdce7618464f7fb06f461e8f4ad575cb1d570f4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"61220ab349485d911083d0b7990ccd3db6c63297\",\"lessThan\":\"f5c68875e25f331e497ddfbe81e2d8163a87f136\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"61220ab349485d911083d0b7990ccd3db6c63297\",\"lessThan\":\"d9c5eecdb3c740e65038651db7c686b10d76d1bc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"61220ab349485d911083d0b7990ccd3db6c63297\",\"lessThan\":\"f1e89a943ee574d0f2f16246eb3f2d7330fdeb03\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"61220ab349485d911083d0b7990ccd3db6c63297\",\"lessThan\":\"225b467e3b631f38be22e4b38062a1fed02fdd21\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"61220ab349485d911083d0b7990ccd3db6c63297\",\"lessThan\":\"fc32be9ac2788524c6b24efd681cce7a6e731a92\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"61220ab349485d911083d0b7990ccd3db6c63297\",\"lessThan\":\"ee1778ba0f5cb53be771f97017d01eb356c797bf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"61220ab349485d911083d0b7990ccd3db6c63297\",\"lessThan\":\"11b326fb0a374f4654f9be22d0f0f7abd9f7d3fe\",\"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\":\"5.10.259\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.210\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.176\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.143\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.93\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.35\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.12\",\"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:C/C:H/I:H/A:H\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.0,\"impactScore\":6.0}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0cdce7618464f7fb06f461e8f4ad575cb1d570f4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/11b326fb0a374f4654f9be22d0f0f7abd9f7d3fe\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/225b467e3b631f38be22e4b38062a1fed02fdd21\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d9c5eecdb3c740e65038651db7c686b10d76d1bc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ee1778ba0f5cb53be771f97017d01eb356c797bf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f1e89a943ee574d0f2f16246eb3f2d7330fdeb03\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f5c68875e25f331e497ddfbe81e2d8163a87f136\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fc32be9ac2788524c6b24efd681cce7a6e731a92\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-09-15T11:25:42+00:00",
      "cve": "CVE-2026-63917",
      "id": "CVE-2026-63917",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:fixed": "309",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ip6: vti: Use ip6_tnl.net in vti6_changelink()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63917.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-10T02:30:20Z",
      "cve": "CVE-2026-63917",
      "id": "CVE-2026-63917",
      "initial_release_date": "2026-07-21T13:03:37Z",
      "product_status:known_affected": "589",
      "product_status:known_not_affected": "6",
      "product_status:recommended": "297",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-63917",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-63917.json",
      "version": "13"
    }
  }
}



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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.