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tipc: require net admin for TIPCv2 netlink mutators

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: tipc: require net admin for TIPCv2 netlink mutators TIPCv2 registers mutating generic-netlink operations without admin permission flags. Generic netlink only checks CAP_NET_ADMIN when an operation sets GENL_ADMIN_PERM or GENL_UNS_ADMIN_PERM, so a local unprivileged process can currently change TIPC state through commands such as TIPC_NL_NET_SET, TIPC_NL_KEY_SET, TIPC_NL_KEY_FLUSH, and bearer enable/disable. The legacy TIPC netlink API already checks netlink_net_capable(..., CAP_NET_ADMIN) for administrative commands. Give the TIPCv2 mutators the equivalent generic-netlink gate. Use GENL_UNS_ADMIN_PERM, which maps to the same namespace-aware CAP_NET_ADMIN check that netlink_net_capable() performs, so the behaviour matches the legacy path and keeps working for CAP_NET_ADMIN holders in a non-initial user namespace (containers). A QEMU/KASAN repro run as uid/gid 65534 with zero effective capabilities previously succeeded in changing the network id and node identity, setting and flushing key material, and enabling/disabling a UDP bearer. With this patch applied the same operations fail with -EPERM.

Announced Source revision 1
Original source ↗

CVE-2026-74283

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-74283

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "0655f6a8635b1b66f2434d5556b1044c14b1ccaf",
        "lessThan": "b06fb5f78a9af0929aaa47c92d0b7bca0617fb25",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0655f6a8635b1b66f2434d5556b1044c14b1ccaf",
        "lessThan": "52864c6c13dcc292481eabfeb3c31a86c3ec06f2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0655f6a8635b1b66f2434d5556b1044c14b1ccaf",
        "lessThan": "e87dcc1a644d087de0bb6c94c6dd28c29b89597f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0655f6a8635b1b66f2434d5556b1044c14b1ccaf",
        "lessThan": "9b937de4b3ded62a24da6e8d9d623cdb2748fa74",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0655f6a8635b1b66f2434d5556b1044c14b1ccaf",
        "lessThan": "c9668a4adb2264625daeeabc7466b783badd4614",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0655f6a8635b1b66f2434d5556b1044c14b1ccaf",
        "lessThan": "cebaefe1aceb650d5c99a4c0e1a4dde09e211818",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0655f6a8635b1b66f2434d5556b1044c14b1ccaf",
        "lessThan": "56f0a2e0a1d004e025cd031c3a801ab73959269f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0655f6a8635b1b66f2434d5556b1044c14b1ccaf",
        "lessThan": "86b0c540e2ea397cde021eecd24145f7c16a3d4e",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/tipc/netlink.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.19"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.19",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.261",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.212",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.178",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.145",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.97",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.40",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.5",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/tipc/netlink.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-74283

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#33079 · Revision 1
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Publisher date
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