CVE-2026-97957

In the Linux kernel, the following vulnerability has been resolved: net: hinic: fix mailbox segment buffer overflow check_mbox_seq_id_and_seg_len() validates that seq_id does not exceed SEQ_ID_MAX_VAL (42) and seg_len does not exceed MBOX_SEG_LEN (48). However, this allows the last segment (seq_id=42) to carry a full 48-byte payload, writing to offset 42*48=2016 for 48 bytes (ending at byte 2064). The receive buffer is only MBOX_MAX_BUF_SZ (2048) bytes, resulting in a 16-byte heap buffer overflow. The hinic3 driver already handles this correctly by defining MBOX_LAST_SEG_MAX_LEN and rejecting the last segment when it exceeds the remaining buffer space. Apply the same fix to the hinic driver.

• https://git.kernel.org/stable/c/513f7b16ed0cffae9348151c72bed17c7073096f
• https://git.kernel.org/stable/c/5d4d985957434867bbe85e4fa5e638f3e48ad522
• https://git.kernel.org/stable/c/9f6ad383901d0cb1c8ea5f7f3160fabfe1540eb5
• https://git.kernel.org/stable/c/eca54a092d5f7b497b458ff5a6f66d4f7bfb6674

Published

Sep 25, 2026

Last Modified

Sep 25, 2026

Status

Received

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