CVE-2026-74377 Linux CVE debrief

Who should care

Linux system administrators and users, as well as developers working with RDMA/rxe, should assess exposure and apply patches to prevent potential exploitation. Additionally, security teams and vulnerability management teams should review system configurations and ensure that RDMA/rxe is properly secured. Operators and platform administrators should verify their Linux kernel versions and update to patched versions if necessary.

Why it matters

CVE-2026-74377 is a high-severity vulnerability in the Linux kernel's RDMA/rxe component. It allows a malicious user to modify WQE fields, leading to out-of-bounds reads. Linux system administrators and users should assess exposure and apply patches to prevent potential exploitation.

• Verify Linux kernel versions and apply patches to prevent exploitation.
• Monitor system logs for potential exploitation attempts.
• Review system configurations to ensure RDMA/rxe is properly secured.

Technical summary

The Linux kernel's RDMA/rxe component is vulnerable to a user-modifiable WQE field issue, allowing out-of-bounds reads. A fix is provided by introducing get_recv_wqe() to validate and copy WQEs to a kernel-local buffer, preventing potential exploitation. This fix ensures that WQE fields are validated and copied to a secure location before processing, preventing out-of-bounds reads and potential system compromise. The vulnerability has been resolved, and patches are available for affected systems. Users should verify their Linux kernel versions and apply patches to prevent exploitation.

Defensive priority

High

Recommended defensive actions

• Review and apply the provided kernel patches to ensure the vulnerability is addressed.
• Verify the Linux kernel version and update to a patched version if necessary.
• Monitor system logs for potential exploitation attempts.
• Review system configurations to ensure RDMA/rxe is properly secured.
• Perform a thorough review of system logs to detect any potential exploitation attempts.
• Consider implementing compensating controls for exposed systems while remediation is scheduled and verified.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The CVE record and source item provide details on the vulnerability, while the NVD entry offers additional context. Supplemental sources include kernel.org references. The vulnerability has been resolved in the Linux kernel, and patches are available for affected systems. Users should verify their Linux kernel versions and apply patches to prevent exploitation.

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.