Heap-based buffer overflow in Linux kernel - CVE-2026-97957

Vulnerability details

The vulnerability allows a local user to cause a heap-based buffer overflow.

The vulnerability exists due to improper bounds checking in check_mbox_seq_id_and_seg_len() in the hinic driver mailbox receive handler when processing mailbox segments. A local user can send a mailbox segment whose final sequence segment exceeds the remaining receive-buffer space to cause a heap-based buffer overflow.

Affected software

How to mitigate CVE-2026-97957

External References

• 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

Related Security Bulletins

• Heap-based buffer overflow in Linux kernel huawei hinic driver