Linux Kernel Memory Allocation Error Causes Heap Overflow

CVE-2026-80617 is a critical heap buffer overflow vulnerability in the Linux kernel's Airoha network driver affecting memory allocation for the foe_check_time array. The vulnerability stems from an undersized buffer allocation—the driver allocates only ppe_num_entries bytes for a u16 pointer array that requires ppe_num_entries * sizeof(u16) bytes. When the airoha_ppe_foe_verify_entry() function processes hash values exceeding half the number of PPE entries, it writes beyond the allocated heap buffer, triggering memory corruption. This affects Linux systems running the Airoha Ethernet driver, potentially enabling denial of service through kernel crashes or escalation to code execution on vulnerable deployments.

While CVE-2026-80617 lacks direct MITRE ATT&CK mappings, Casky's Claude-powered analysis would detect the exploitation patterns associated with this vulnerability through memory safety detection skills and kernel exploitation reconnaissance. Security practitioners using Casky would observe findings related to T1203 (Exploitation for Privilege Escalation) and T1499 (Endpoint Denial of Service) as the overflow could be weaponized for both effects. The platform's extended reasoning would flag suspicious network driver interactions, abnormal memory writes to heap regions, and kernel panic signatures—indicators that an attacker is probing or exploiting the allocation size mismatch. Practitioners would receive alerts on kernel memory violation attempts and driver-level buffer manipulation patterns, enabling early detection before heap corruption reaches critical system components.