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

Vulnerability from cvelistv5 – Published: 2026-07-19 14:55 – Updated: 2026-07-20 13:41
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
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)
Create a notification for this product.
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)
Create a notification for this product.
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      "descriptions": [
        {
          "lang": "en",
          "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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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/11b326fb0a374f4654f9be22d0f0f7abd9f7d3fe"
        }
      ],
      "title": "ip6: vti: Use ip6_tnl.net in vti6_changelink().",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63917",
    "datePublished": "2026-07-19T14:55:20.703Z",
    "dateReserved": "2026-07-19T07:54:57.020Z",
    "dateUpdated": "2026-07-20T13:41:27.007Z",
    "state": "PUBLISHED"
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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": "2026-07-21T16:26:17+00:00",
      "cve": "CVE-2026-63917",
      "id": "CVE-2026-63917",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "15",
      "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"
    }
  }
}



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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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