CVE-2026-46145 Linux CVE debrief

Who should care

Linux kernel maintainers, Linux distribution maintainers, and users of Linux kernel versions 6.2 through 7.0.7, and 7.1 rc1 and rc2, should assess exposure and apply patches or updates to prevent potential kernel memory overflows.

Why it matters

This vulnerability allows userspace to pass an unchecked rx_hash_key_len value, which can lead to a kernel memory overflow. Linux kernel maintainers, Linux distribution maintainers, and users of affected Linux kernel versions should assess exposure and apply patches or updates to prevent potential kernel memory overflows.

• Verify Linux kernel versions and apply patches or updates to prevent potential kernel memory overflows
• Monitor Linux kernel updates and patches for potential vulnerabilities
• Review and update Linux kernel versions to ensure they are not vulnerable

Technical summary

The Linux kernel's RDMA/mana component does not validate the rx_hash_key_len value, allowing userspace to pass an unchecked value that can lead to a kernel memory overflow. This issue has been resolved with bounds checking to prevent the memcpy overflow. The vulnerability affects Linux kernel versions 6.2 through 7.0.7, and 7.1 rc1 and rc2. Linux kernel maintainers, Linux distribution maintainers, and users of affected Linux kernel versions should assess exposure and apply patches or updates to prevent potential kernel memory overflows.

Defensive priority

Apply patches or updates from the Linux kernel maintainers to ensure the RDMA/mana component is using the validated rx_hash_key_len value.

Recommended defensive actions

• Apply patches or updates from the Linux kernel maintainers to ensure the RDMA/mana component is using the validated rx_hash_key_len value.
• Review and update Linux kernel versions to ensure they are not vulnerable.
• Monitor Linux kernel updates and patches for potential vulnerabilities.
• Verify Linux kernel versions and apply patches or updates to prevent potential kernel memory overflows.
• 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.

Evidence notes

The CVE record and NVD detail page provide information on the vulnerability, including its description, CVSS score, and affected versions. Multiple patch references are provided, including several from the Linux kernel stable repository and Red Hat errata.

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.