CVE-2026-18909 Memory corruption in ELAN Smart-Pad
A local attacker can trigger a kernel stack buffer overflow in ELAN Smart-Pad drivers, causing a system crash and denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-18909?
CVE-2026-18909 is a medium-severity memory corruption vulnerability in ELAN Smart-Pad, published on 6 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A stack-based buffer overflow vulnerability exists in ELAN Microelectronics Corp. ELAN Smart-Pad on Windows (ETD.sys and ETDSMBus.sys). During Intel SMBus recovery, ETDSMBus.sys does not enforce an upper-bound check on the hardware-derived report count, allowing an out-of-range value to be forwarded to ETD.sys where it is used as a loop counter for a stack buffer copy without destination size validation. A local attacker with standard user privileges can trigger a kernel bugcheck (BSOD 0xF7 DRIVER_OVERRAN_STACK_BUFFER), resulting in denial of service. This issue affects ELAN Smart-Pad through ETD24.21.52.3.
Weakness: CWE-121
Which versions are affected by CVE-2026-18909?
How do I fix CVE-2026-18909?
No fix has been published for CVE-2026-18909 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-18909 being exploited?
There is no known exploitation of CVE-2026-18909 in the wild and no public exploit code.
Sources
Also known as GHSA-558p-f327-84r7.