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CVE-2026-97957

8.8 · HIGH

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_MA…

Published Sep 25, 2026EPSS 0.14%

Overview

CVE-2026-97957 is a high-severity vulnerability. It was published on September 25, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/513f7b16ed0cffae9348151c72bed17c7073096fRefgit.kernel.org/stable/c/5d4d985957434867bbe85e4fa5e638f3e48ad522Refgit.kernel.org/stable/c/72be1fd5d256dde748c0905c5e1749a119cad5bdRefgit.kernel.org/stable/c/7cc974799fde846eda2d8f00ad4f8e1810eb0499Refgit.kernel.org/stable/c/8de1e23bd91fe3a6683e4bc574e2d6bcb0eef920Refgit.kernel.org/stable/c/9f6ad383901d0cb1c8ea5f7f3160fabfe1540eb5Refgit.kernel.org/stable/c/c622bbc212207d7c6bbd69dd88f0c3a3f5853d16Refgit.kernel.org/stable/c/eca54a092d5f7b497b458ff5a6f66d4f7bfb6674

How CyberStrike helps

Frequently asked questions

What is CVE-2026-97957?

CVE-2026-97957 is a high-severity vulnerability. It was published on September 25, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-97957?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-97957?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-97957?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-97957 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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