tipc: require net admin for TIPCv2 netlink mutators

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74283
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:27 UTC
Updated2026-08-17 06:19:22 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.002100000 probability, percentile 0.115980000 (date 2026-08-16)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 0655f6a8635b1b66f2434d5556b1044c14b1ccaf b06fb5f78a9af0929aaa47c92d0b7bca0617fb25 git Not specified
CNA Linux Linux affected 0655f6a8635b1b66f2434d5556b1044c14b1ccaf 52864c6c13dcc292481eabfeb3c31a86c3ec06f2 git Not specified
CNA Linux Linux affected 0655f6a8635b1b66f2434d5556b1044c14b1ccaf e87dcc1a644d087de0bb6c94c6dd28c29b89597f git Not specified
CNA Linux Linux affected 0655f6a8635b1b66f2434d5556b1044c14b1ccaf 9b937de4b3ded62a24da6e8d9d623cdb2748fa74 git Not specified
CNA Linux Linux affected 0655f6a8635b1b66f2434d5556b1044c14b1ccaf c9668a4adb2264625daeeabc7466b783badd4614 git Not specified
CNA Linux Linux affected 0655f6a8635b1b66f2434d5556b1044c14b1ccaf cebaefe1aceb650d5c99a4c0e1a4dde09e211818 git Not specified
CNA Linux Linux affected 0655f6a8635b1b66f2434d5556b1044c14b1ccaf 56f0a2e0a1d004e025cd031c3a801ab73959269f git Not specified
CNA Linux Linux affected 0655f6a8635b1b66f2434d5556b1044c14b1ccaf 86b0c540e2ea397cde021eecd24145f7c16a3d4e git Not specified
CNA Linux Linux affected 3.19 Not specified
CNA Linux Linux unaffected 3.19 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/86b0c540e2ea397cde021eecd24145f7c16a3d4e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b06fb5f78a9af0929aaa47c92d0b7bca0617fb25 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cebaefe1aceb650d5c99a4c0e1a4dde09e211818 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/56f0a2e0a1d004e025cd031c3a801ab73959269f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e87dcc1a644d087de0bb6c94c6dd28c29b89597f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9b937de4b3ded62a24da6e8d9d623cdb2748fa74 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/52864c6c13dcc292481eabfeb3c31a86c3ec06f2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c9668a4adb2264625daeeabc7466b783badd4614 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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