CVE-2026-52971

A flaw was found in the Linux kernel's Elastic Network Adapter (ENA) driver, specifically within the Precision Time Protocol Hardware Clock (PHC) timestamp retrieval function. A race condition exists where the get_timestamp function could attempt to access memory that has already been freed by the ena_com_phc_destroy function. This use-after-free vulnerability can lead to a NULL pointer dereference, potentially causing a system crash and resulting in a Denial of Service (DoS).

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

For systems where the ena kernel module is not required, it can be blacklisted to prevent it from loading. Create a file such as /etc/modprobe.d/blacklist-ena.conf with the content blacklist ena. A system reboot is necessary for this change to take effect. Disabling the ena module may impact network functionality if Elastic Network Adapters are in use.