CVE-2026-81644: Huawei HarmonyOS DoS vulnerability in preview service module

Executive brief

Huawei's HarmonyOS operating system used in phones, tablets, and PCs contains a denial-of-service vulnerability in its preview service module. An attacker could exploit this flaw to disrupt the availability of affected devices, potentially causing performance degradation or service interruption for end users.

Technical details

CVE-2026-81644 is a denial-of-service vulnerability within HarmonyOS's preview service module. The vulnerability allows successful exploitation to impact system availability. The flaw affects HarmonyOS 6.1.0 across multiple device categories (phones, tablets, and PCs). No information is available in the advisory regarding the specific attack vector, required preconditions, or detailed attack methodology. Patches are expected as part of Huawei's monthly security updates.

Affected products

• Huawei HarmonyOS 6.1.0

Timeline

• 2026-09-05: disclosed
• 2026-09-09: advisory

References

• https://consumer.huawei.com/en/support/bulletin/2026/9/
• https://consumer.huawei.com/en/support/bulletinlaptops/2026/9/