CVE-2026-72093 Linux CVE debrief

Who should care

Linux kernel developers, users, and security teams who manage Linux kernel deployments should be aware of this vulnerability and review the Linux kernel code for similar issues. They should also monitor for potential exploits and apply the patch from the Linux kernel repository. Additionally, operators and platform administrators should review the affected scope and severity to determine the necessary actions. Vulnerability management teams should track exceptions and retest remediated assets to ensure the issue is resolved. Security teams should review compensating controls for exposed systems while remediation is scheduled and verified. Asset inventory and change management teams should also be involved in the remediation process. Rollback and change window planning should be considered to minimize downtime and ensure a smooth remediation process. Source tracking and monitoring should be implemented to detect potential attacks. Overall, a coordinated effort is required to address this vulnerability and prevent potential attacks. The priority is high due to the potential impact on Linux kernel deployments. The vulnerability management team should prioritize patching and verifying the remediation to minimize the risk of exploitation. The security team should also review the Linux kernel code and check for similar issues to prevent future vulnerabilities. The affected scope is limited to Linux kernel deployments, but the potential impact is high due to the widespread use of the Linux kernel in various systems. The source confidence is high, but the exact impact is still unknown. Defenders should verify the affected scope and severity to determine the necessary actions. The Linux kernel community should also be involved in the remediation process to ensure the issue is resolved and to prevent future vulnerabilities. The vulnerability is a use-after-free issue, which can lead to a crash or potentially allow an attacker to execute arbitrary code. The issue is resolved by returning directly from close_vma instead of falling through to put_obj. The patch from the Linux kernel repository should be applied to fix the issue. The Linux kernel developers and users should

Technical summary

The Linux kernel has a use-after-free vulnerability in the amdxdna_gem_dmabuf_mmap() function. When vm_insert_pages() fails, the error path calls vma->vm_ops->close(vma), which releases the GEM object reference. However, the close_vma label then falls through to put_obj, causing a second release of the same object, leading to a use-after-free. The issue is resolved by returning directly from close_vma instead of falling through to put_obj. This vulnerability affects Linux kernel developers and users who need to review and apply the patch.

Defensive priority

High

Recommended defensive actions

• Apply the patch from the Linux kernel repository
• Review the Linux kernel code for similar issues
• Monitor for potential exploits
• 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.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• Review compensating controls for exposed systems while remediation is scheduled and verified.

Evidence notes

The vulnerability is caused by a use-after-free in the amdxdna_gem_dmabuf_mmap() function. The error path calls vma->vm_ops->close(vma), which releases the GEM object reference. However, the close_vma label then falls through to put_obj, causing a second release of the same object. To verify, defenders should review the Linux kernel code and check for similar issues. The affected scope is limited to Linux kernel deployments. The source confidence is high, but the exact impact is still unknown.

Official resources