CVE-2025-71112 Linux CVE debrief

Who should care

Users of the Linux kernel, particularly those using versions 5.3.1 to 6.18.3, should be aware of this vulnerability and take steps to mitigate it. Operators, platform administrators, vulnerability management teams, and security teams should review their deployments and apply patches or mitigations as necessary.

Technical summary

The vulnerability exists in the Linux kernel's handling of VLAN configuration mailboxes from VF. The length of vlan_del_fail_bmap is BITS_TO_LONGS(VLAN_N_VID), which could lead to out-of-bounds memory access if the VLAN id is greater than or equal to VLAN_N_VID. The issue has been addressed by adding VLAN id validation to ensure that the VLAN id is within the valid range. Affected users should review their deployments, apply patches, and monitor for potential exploitation attempts. This vulnerability impacts users of the Linux kernel, particularly those using versions 5.3.1 to 6.18.3, and operators, platform administrators, vulnerability management teams, and security teams should review their deployments and apply patches or mitigations as necessary.

Defensive priority

High

Recommended defensive actions

• Apply patches from the Linux kernel repository
• Update to a version of the Linux kernel that includes the fix
• Monitor for and respond to potential exploitation attempts
• 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 was published on 2026-01-14T15:16:00.313Z and last modified on 2026-07-14T13:18:03.337Z. The NVD entry is currently Modified. Evidence is limited to public sources and may not reflect the full scope or impact of this vulnerability. Defenders should verify affected deployments and review official advisories for specific guidance.

Official resources