CVE-2026-31541

/// Technical description

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

tracing: Fix trace_marker copy link list updates

When the "copy_trace_marker" option is enabled for an instance, anything

written into /sys/kernel/tracing/trace_marker is also copied into that

instances buffer. When the option is set, that instance's trace_array

descriptor is added to the marker_copies link list. This list is protected

by RCU, as all iterations uses an RCU protected list traversal.

When the instance is deleted, all the flags that were enabled are cleared.

This also clears the copy_trace_marker flag and removes the trace_array

descriptor from the list.

The issue is after the flags are called, a direct call to

update_marker_trace() is performed to clear the flag. This function

returns true if the state of the flag changed and false otherwise. If it

returns true here, synchronize_rcu() is called to make sure all readers

see that its removed from the list.

But since the flag was already cleared, the s

/// 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