CVE-2026-10671 zephyrproject CVE debrief

Who should care

Organizations using Zephyr's kernel pipe implementation, particularly those with unprivileged user threads accessing k_pipe objects, should be aware of this vulnerability and take steps to patch or mitigate it. This includes operators, platform administrators, vulnerability management teams, and security teams who need to assess the impact on their systems and prioritize patching to prevent potential list corruption and invalid kernel writes.

Technical summary

The vulnerability in Zephyr's kernel pipe implementation allows an unprivileged user thread to re-initialize a pipe that is already in use, leading to list corruption and potential invalid kernel writes. This occurs because the userspace syscall verifier z_vrfy_k_pipe_init() uses K_SYSCALL_OBJ() instead of K_SYSCALL_OBJ_NEVER_INIT(). The flaw can result in lost wakeups, indefinitely blocked threads, and silent data loss. The fix switches the verifier to K_SYSCALL_OBJ_NEVER_INIT(), matching the existing k_msgq_init verifier, so a user thread can no longer re-initialize a live pipe.

Defensive priority

Organizations using Zephyr's kernel pipe implementation, particularly those with unprivileged user threads accessing k_pipe objects, should prioritize patching to prevent potential list corruption and invalid kernel writes.

Recommended defensive actions

• Apply the patch referenced in the vendor advisory
• Restrict access to k_pipe objects for unprivileged user threads
• Monitor for 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 vulnerability exists in Zephyr's kernel pipe implementation, specifically in the userspace syscall verifier z_vrfy_k_pipe_init(). An unprivileged user thread with access to a k_pipe object can re-initialize a pipe that is already in use, leading to list corruption and potential invalid kernel writes. Evidence is based on official CVE and NVD records, as well as vendor references.

Official resources