CVE-2026-98076

/// Technical description

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

tracing/probes: Fix use-after-free on field name/type of events with multiple probes

The fields of a probe-based dynamic event (kprobe, uprobe, eprobe and

fprobe events) are created in traceprobe_define_arg_fields() by handing

the probe_arg name/type strings to trace_define_field(), which only

stores the pointers without copying. Those strings are owned by the

trace_probe and are freed when that probe is removed.

An event can have several probes attached. The field list is defined

only once, by the first probe that registers the event, but it is kept

alive by any surviving sibling probe. Deleting just that first probe by

symbol -

# primary A: fields are defined from A's args

echo 'p:kprobes/ev vfs_read a1=$arg1' > kprobe_events

# append B: shares A's event call

echo 'p:kprobes/ev vfs_write a1=$arg1' >> kprobe_events

# delete only A (matched by symbol), B survives

echo '-:kprobes/ev vfs_read'

/// 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