CVE-2026-74283 Linux CVE debrief

Who should care

Linux system administrators and users with TIPCv2 enabled in their kernel configurations should assess exposure and apply patches or updates to prevent unauthorized changes to TIPC state.

Why it matters

This vulnerability allows a local unprivileged process to change TIPC state through certain commands in the Linux kernel's TIPCv2 implementation. Linux system administrators and users with TIPCv2 enabled in their kernel configurations should assess exposure and apply patches or updates to prevent unauthorized changes to TIPC state.

• Verify TIPCv2 netlink mutator permissions to prevent unauthorized changes to TIPC state
• Apply patches or updates to Linux kernel versions with fixes to prevent exploitation
• Monitor system configurations and permissions for TIPCv2 netlink mutators to detect potential security issues

Technical summary

The Linux kernel's TIPCv2 implementation did not require net admin permissions for certain netlink mutators, allowing a local unprivileged process to change TIPC state. This issue has been resolved by adding a permission check for TIPCv2 netlink mutators, ensuring that only authorized users can modify TIPC state. The fix prevents unauthorized changes to TIPC state, improving system security and stability. The vulnerability was addressed by requiring net admin permissions for TIPCv2 netlink mutators, aligning with the legacy TIPC netlink API's permission checks.

Defensive priority

Apply patch or update to Linux kernel version with fix; verify system configurations and permissions.

Recommended defensive actions

• Apply patch or update to Linux kernel version with fix
• Verify system configurations and permissions for TIPCv2 netlink mutators
• Monitor system for potential unauthorized changes to TIPC state
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and source item provide details on the vulnerability and its resolution. Linux kernel developers have addressed the issue by adding a permission check for TIPCv2 netlink mutators. The fix requires net admin permissions for TIPCv2 netlink mutators, preventing unauthorized changes to TIPC state. The source item and CVE record provide evidence of the vulnerability's existence and resolution.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.