CVE-2026-90194 ACPI: scan: fix bus ID cleanup on device_add() failures
A memory leak in the Linux kernel ACPI scan module can lead to resource exhaustion and denial of service when device addition fails.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-90194?
CVE-2026-90194 is a memory corruption vulnerability in Linux, published on 17 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:
ACPI: scan: fix bus ID cleanup on device_add() failures
When device_add() fails after acpi_device_set_name() has allocated an instance ID and a new acpi_device_bus_id has been linked into acpi_bus_id_list, the rollback path only removes wakeup_list and detaches the ACPI handle data.
That leaves the bus-ID bookkeeping behind and keeps the allocated instance number consumed.
Move the bus-ID cleanup and wakeup-list removal into a single helper.
Use it from both the normal device teardown path and the device_add() rollback path. The wakeup list node is initialized before registration, so it can be deleted without checking whether the device is wakeup- capable like in the original teardown path.
[ rjw: Rename acpi_device_del_list() to acpi_device_cleanup() ] [ rjw: Subject and changelog edits ]
Which versions are affected by CVE-2026-90194?
How do I fix CVE-2026-90194?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-90194 being exploited?
There is no known exploitation of CVE-2026-90194 in the wild and no public exploit code.
Sources
Also known as AZL-102036, BELL-CVE-2026-90194, DEBIAN-CVE-2026-90194, GHSA-37ww-vf7x-2832, UBUNTU-CVE-2026-90194.