net: hinic: fix mailbox segment buffer overflow

Answer in brief

CVE-2026-97957 records a High severity (CVSS 8.8) vulnerability in net: hinic: fix mailbox segment buffer overflow. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 25, 2026Updated Sep 25, 2026Source checked Sep 25, 2026First seen by HOL Sep 25, 2026Material review Sep 25, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.8
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=a425b6e1c69ba907b72b737a4d44f8cfbc43ce3c <eca54a092d5f7b497b458ff5a6f66d4f7bfb6674 \|\| >=a425b6e1c69ba907b72b737a4d44f8cfbc43ce3c <9f6ad383901d0cb1c8ea5f7f3160fabfe1540eb5 \|\| >=a425b6e1c69ba907b72b737a4d44f8cfbc43ce3c <513f7b16ed0cffae9348151c72bed17c7073096f \|\| >=a425b6e1c69ba907b72b737a4d44f8cfbc43ce3c <5d4d985957434867bbe85e4fa5e638f3e48ad522	eca54a092d5f7b497b458ff5a6f66d4f7bfb6674, 9f6ad383901d0cb1c8ea5f7f3160fabfe1540eb5, 513f7b16ed0cffae9348151c72bed17c7073096f, 5d4d985957434867bbe85e4fa5e638f3e48ad522
Linux/Linuxgeneric	5.8	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to eca54a092d5f7b497b458ff5a6f66d4f7bfb6674 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 25, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.