CVE-2026-63880 Linux CVE debrief

Who should care

System administrators and users of Linux kernel versions affected by this vulnerability should apply patches or mitigations to prevent potential denial of service attacks. This includes reviewing and updating Linux kernel versions to ensure the fix is applied, monitoring system logs for potential denial of service attacks, and taking steps to verify the vulnerability's presence in their environment.

Technical summary

The AMDGPU_GEM_OP_GET_MAPPING_INFO branch of amdgpu_gem_op_ioctl() holds three cleanup-tracked resources before calling kvcalloc(): the drm_gem_object reference from drm_gem_object_lookup(), the drm_exec lock on the looked-up GEM via drm_exec_lock_obj(), and the drm_exec lock on the per-process VM root page directory via amdgpu_vm_lock_pd(). The kvcalloc() failure path returns -ENOMEM directly, skipping out_exec and leaking all three. This results in a lock leak that can cause an unprivileged-local denial of service against the caller's GPU context.

Defensive priority

High

Recommended defensive actions

• Apply the official patch to fix the lock leak vulnerability
• Review and update Linux kernel versions to ensure the fix is applied
• Monitor system logs for potential denial of service attacks
• 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 2026-07-19T16:17:05.007Z and has not been modified since then. The NVD entry is currently Received. There is no additional information available about the vulnerability beyond what is provided in the CVE record and NVD entry.

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.