CVE-2026-97499 coresight: perf: Retrieve path and source from event data
A race condition in Linux kernel Coresight ETM perf callbacks can lead to instability or crashes during device registration and unregistration.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-97499?
CVE-2026-97499 is a vulnerability in Linux, published on 24 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
coresight: perf: Retrieve path and source from event data
ETM perf callbacks currently use the per-CPU csdev_src pointer, which can race with updates during device registration and unregistration.
The AUX setup already builds and stores the path in the event data. Use this path to retrieve the source instead of csdev_src to avoid the race.
Export coresight_get_source() and add etm_event_get_ctxt_path() to retrieve the context's path and its source with READ_ONCE() / WRITE_ONCE() accessors. Give the comments to explain why this approach is safe when pause or resume callbacks preempt the disable callback (e.g. via NMI).
Which versions are affected by CVE-2026-97499?
How do I fix CVE-2026-97499?
Apply the vendor's patch.
Is CVE-2026-97499 being exploited?
There is no known exploitation of CVE-2026-97499 in the wild and no public exploit code.
Sources
Also known as AZL-103988, BELL-CVE-2026-97499, DEBIAN-CVE-2026-97499, GHSA-656w-9gg9-4hhp, UBUNTU-CVE-2026-97499.