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CVE-2026-98076 Affecting kernel-livepatch-6.12.111-136.204 package, versions <1:1.0-0.amzn2023

Severity

 Recommended
high

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.21% (11th percentile)

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  • Snyk IDSNYK-AMZN2023-KERNELLIVEPATCH612111136204-20859074
  • published13 Oct 2026
  • disclosed25 Sept 2026
Report a new vulnerability Found a mistake?

Introduced: 25 Sep 2026

NewCVE-2026-98076  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 kernel-livepatch-6.12.111-136.204 to version 1:1.0-0.amzn2023 or higher.
This issue was patched in ALAS2023-2026-3193.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-livepatch-6.12.111-136.204 package and not the kernel-livepatch-6.12.111-136.204 package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

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' >> kprobe_events

frees A's args (trace_probe_cleanup() -> traceprobe_free_probe_arg()), but trace_probe_unlink() keeps the trace_probe_event because the probe list is not empty. The event call stays registered via B while its fields now reference freed memory. Any field lookup then reads it, e.g.

echo 'a1 == 1' > events/kprobes/ev/filter

BUG: KASAN: slab-use-after-free in strcmp+0xa7/0xb0 Call Trace: strcmp trace_find_event_field parse_pred process_preds create_filter apply_event_filter event_filter_write

field->name references parg->name (kstrdup'd, freed with the probe) and, for array arguments, field->type references parg->fmt (kmalloc'd, freed with the probe) - the scalar type otherwise points at the static fmttype rodata, which is safe.

Have traceprobe_define_arg_fields() duplicate the name and type strings and anchor the copies on the trace_probe_event, which embeds the event call and outlives every individual probe; trace_probe_event_free() releases them.

The reproducer above triggers reliably; the field lookup and the delete both run under event_mutex, so this is a dangling reference after removal rather than a race.

The issue was found by the autokbug dynamic kernel fuzzer at Tencent Yunding Lab.