CVE-2026-68142 (GCVE-0-2026-68142)

Vulnerability from cvelistv5 – Published: 2026-08-10 11:59 – Updated: 2026-08-19 16:30
VLAI
Title
geneve: require CAP_NET_ADMIN in the device netns for changelink
Summary
In the Linux kernel, the following vulnerability has been resolved: geneve: require CAP_NET_ADMIN in the device netns for changelink A tunnel changelink() operates on at most two netns, dev_net(dev) and the sticky underlay netns geneve->net. They differ once the device is created in or moved to a netns other than the one the request runs in. The rtnl changelink path checks CAP_NET_ADMIN only against dev_net(dev), so a caller privileged there but not in geneve->net can rewrite a geneve device whose underlay lives in geneve->net. geneve_changelink() applies the new configuration against geneve->net: geneve_link_config() and the geneve_quiesce()/geneve_unquiesce() pair reopen the underlay sockets in that netns (geneve_sock_add() uses geneve->net), so the same reasoning as the tunnel changelink series applies here. Gate geneve_changelink() with rtnl_dev_link_net_capable(), at the top of the op before any attribute is parsed, matching ipgre_changelink() and the rest of the "require CAP_NET_ADMIN in the device netns for changelink" series. Found by 0sec automated security-research tooling (https://0sec.ai).
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: 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a , < a5522963c57f12df5f9db804ebfc472b58eef0ae (git)
Affected: 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a , < 278c6a31ee27c931c722202c8c06cc3253923254 (git)
Affected: 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a , < 11a7d989d00160481a273eb4f7f05f64b5a6ffdf (git)
Affected: 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a , < 2abdacc927c92fa6a9cc8341e8c9b88dcb561553 (git)
Affected: 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a , < 9de5518fc1fab583526a8f66b8e505c4864dc60a (git)
Affected: 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a , < f8c498585d2a08aa623748353c3e61467b7e9fd2 (git)
Affected: 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a , < 95f45e20f1b2cec13823f0f68060ab4b2261b2c1 (git)
Affected: 5b861f6baa3a22a48d7a4ad0ce38a223d36c978a , < 8efb8f8bbb353b8f2fdf4f37534c6d96c9f69e01 (git)
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Linux Linux Affected: 4.14
Unaffected: 0 , < 4.14 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngeneve: require CAP_NET_ADMIN in the device netns for changelink\n\nA tunnel changelink() operates on at most two netns, dev_net(dev) and\nthe sticky underlay netns geneve-\u003enet. They differ once the device is\ncreated in or moved to a netns other than the one the request runs in.\nThe rtnl changelink path checks CAP_NET_ADMIN only against dev_net(dev),\nso a caller privileged there but not in geneve-\u003enet can rewrite a geneve\ndevice whose underlay lives in geneve-\u003enet.\n\ngeneve_changelink() applies the new configuration against geneve-\u003enet:\ngeneve_link_config() and the geneve_quiesce()/geneve_unquiesce() pair\nreopen the underlay sockets in that netns (geneve_sock_add() uses\ngeneve-\u003enet), so the same reasoning as the tunnel changelink series\napplies here.\n\nGate geneve_changelink() with rtnl_dev_link_net_capable(), at the top of\nthe op before any attribute is parsed, matching ipgre_changelink() and\nthe rest of the \"require CAP_NET_ADMIN in the device netns for\nchangelink\" series.\n\nFound by 0sec automated security-research tooling (https://0sec.ai)."
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              "lang": "en",
              "value": "AV:L - Exploitation requires issuing RTM_NEWLINK changelink over a local rtnetlink socket; geneve_changelink is only reachable from the rtnl configuration path, not from received GENEVE/UDP network packets.\nAC:L - Once a geneve device exists with geneve-\u003enet differing from dev_net(dev) (via IFLA_NET_NS_FD migration or IFLA_LINK_NETNSID newlink), a single deterministic netlink changelink bypasses the missing check with no race or memory-layout dependency.\nPR:L - The rtnl entry path requires CAP_NET_ADMIN in dev_net(dev), obtainable by an unprivileged local user inside a user+network namespace via unshare --user --map-root-user --net; no CAP_NET_ADMIN in the sticky underlay netns geneve-\u003enet is needed.\nUI:N - The attack is fully programmatic through netlink from the attacker\u0027s own process; no victim action such as mounting a filesystem, opening a file, or clicking is required.\nS:C - geneve_changelink applies geneve_link_config() and geneve_quiesce()/geneve_unquiesce() (reopening underlay sockets via geneve_sock_add() in geneve-\u003enet) while authorization is checked only against dev_net(dev), crossing into another tenant\u0027s or the host\u0027s network namespace.\nC:H - An attacker can set IFLA_GENEVE_REMOTE/REMOTE6 to redirect encapsulated overlay traffic to an attacker-controlled endpoint and read tunneled payloads from the victim underlay netns.\nI:H - Unauthorized changelink mutates live tunnel remote endpoint, TTL/TOS/DF/label, and MTU in geneve-\u003enet, enabling redirection and injection of overlay traffic without authorization in that namespace.\nA:H - geneve_quiesce() drops in-flight tunnel traffic and rewriting the remote endpoint or MTU breaks production GENEVE overlays (Kubernetes/OVN/cloud SDN), causing sustained loss of connectivity for dependent services."
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    "dateReserved": "2026-07-30T09:28:09.370Z",
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    "state": "PUBLISHED"
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They differ once the device is\\ncreated in or moved to a netns other than the one the request runs in.\\nThe rtnl changelink path checks CAP_NET_ADMIN only against dev_net(dev),\\nso a caller privileged there but not in geneve-\u003enet can rewrite a geneve\\ndevice whose underlay lives in geneve-\u003enet.\\n\\ngeneve_changelink() applies the new configuration against geneve-\u003enet:\\ngeneve_link_config() and the geneve_quiesce()/geneve_unquiesce() pair\\nreopen the underlay sockets in that netns (geneve_sock_add() uses\\ngeneve-\u003enet), so the same reasoning as the tunnel changelink series\\napplies here.\\n\\nGate geneve_changelink() with rtnl_dev_link_net_capable(), at the top of\\nthe op before any attribute is parsed, matching ipgre_changelink() and\\nthe rest of the \\\"require CAP_NET_ADMIN in the device netns for\\nchangelink\\\" series.\\n\\nFound by 0sec automated security-research tooling (https://0sec.ai).\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/geneve.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5b861f6baa3a22a48d7a4ad0ce38a223d36c978a\",\"lessThan\":\"a5522963c57f12df5f9db804ebfc472b58eef0ae\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5b861f6baa3a22a48d7a4ad0ce38a223d36c978a\",\"lessThan\":\"278c6a31ee27c931c722202c8c06cc3253923254\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5b861f6baa3a22a48d7a4ad0ce38a223d36c978a\",\"lessThan\":\"11a7d989d00160481a273eb4f7f05f64b5a6ffdf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5b861f6baa3a22a48d7a4ad0ce38a223d36c978a\",\"lessThan\":\"2abdacc927c92fa6a9cc8341e8c9b88dcb561553\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5b861f6baa3a22a48d7a4ad0ce38a223d36c978a\",\"lessThan\":\"9de5518fc1fab583526a8f66b8e505c4864dc60a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5b861f6baa3a22a48d7a4ad0ce38a223d36c978a\",\"lessThan\":\"f8c498585d2a08aa623748353c3e61467b7e9fd2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5b861f6baa3a22a48d7a4ad0ce38a223d36c978a\",\"lessThan\":\"95f45e20f1b2cec13823f0f68060ab4b2261b2c1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5b861f6baa3a22a48d7a4ad0ce38a223d36c978a\",\"lessThan\":\"8efb8f8bbb353b8f2fdf4f37534c6d96c9f69e01\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/geneve.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.14\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.14\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.148\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.101\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.42\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.6\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"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/11a7d989d00160481a273eb4f7f05f64b5a6ffdf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/278c6a31ee27c931c722202c8c06cc3253923254\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2abdacc927c92fa6a9cc8341e8c9b88dcb561553\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8efb8f8bbb353b8f2fdf4f37534c6d96c9f69e01\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/95f45e20f1b2cec13823f0f68060ab4b2261b2c1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9de5518fc1fab583526a8f66b8e505c4864dc60a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a5522963c57f12df5f9db804ebfc472b58eef0ae\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f8c498585d2a08aa623748353c3e61467b7e9fd2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-13T23:13:45+00:00",
      "cve": "CVE-2026-68142",
      "id": "CVE-2026-68142",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_affected": "233",
      "product_status:known_not_affected": "43",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: geneve: require CAP_NET_ADMIN in the device netns for changelink",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68142.json",
      "version": "3"
    },
    "suse_vex": {
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      "current_release_date": "2026-08-18T16:56:14Z",
      "cve": "CVE-2026-68142",
      "id": "CVE-2026-68142",
      "initial_release_date": "2026-08-18T16:56:14Z",
      "product_status:known_affected": "231",
      "product_status:known_not_affected": "65",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68142",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68142.json",
      "version": "2"
    }
  }
}



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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.