tipc: require net admin for TIPCv2 netlink mutators
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.
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
- Added to Heist Feed
- Publisher date