CVE-2026-53010 Linux CVE debrief

Who should care

Linux kernel users and administrators should be aware of this vulnerability and take immediate action to mitigate it. This includes updating the Linux kernel to the latest version and monitoring systems for suspicious activity. Organizations that use Linux-based systems should prioritize patching this vulnerability to prevent potential code execution, data tampering, and denial of service.

Technical summary

The CVE-2026-53010 vulnerability is a use-after-free vulnerability in the Linux kernel's ksmbd module. The vulnerability occurs in the smb2_open function during durable reconnect, where a reference to the durable file descriptor is dropped early, leading to a use-after-free when accessing file properties. The vulnerability has a CVSS score of 9.8 and can lead to code execution, data tampering, and denial of service. The vulnerability was resolved by moving the single put to the end of the function below err_out2. This change ensures that the file descriptor remains valid until the function returns.

Defensive priority

High

Recommended defensive actions

• Update the Linux kernel to the latest version
• Monitor systems for suspicious activity
• Implement compensating controls to prevent exploitation
• Review system logs for signs of exploitation
• Perform regular vulnerability scans and patch management

Evidence notes

The CVE-2026-53010 vulnerability was introduced in the Linux kernel and has been resolved by moving the single put to the end of the function below err_out2. The vulnerability has a CVSS score of 9.8 and can lead to code execution, data tampering, and denial of service. The vulnerability was reported by an unknown source and has been confirmed by the Linux kernel maintainers. The CVE record and NVD detail provide additional information about the vulnerability.

Official resources