CVE-2026-93073

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

dax: read holder_ops once in dax_holder_notify_failure()

dax_holder_notify_failure() reads dax_dev->holder_ops twice without

READ_ONCE() -- once for the NULL check and once for the indirect

notify_failure() call. A concurrent fs_put_dax() can clear holder_ops

between the two reads, so the check can observe a non-NULL pointer while

the call dereferences NULL. (kill_dax() also clears holder_ops, but only

after synchronize_srcu(), so it cannot race a reader that is inside

dax_read_lock(); fs_put_dax() does no such synchronization.)

Fetch holder_ops once into a local with READ_ONCE() so the NULL check and

the indirect call observe the same value.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References