High 8.8Published Sep 25, 2026

CVE-2026-97957net: hinic: fix mailbox segment buffer overflow

Updated under an hour ago (Oct 27, 2026, 7:10 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from a425b6e1c69ba907b72b737a4d44f8cfbc43ce3c before 7cc974799fde846eda2d8f00ad4f8e1810eb0499; from a425b6e1c69ba907b72b737a4d44f8cfbc43ce3c before 8de1e23bd91fe3a6683e4bc574e2d6bcb0eef920; from a425b6e1c69ba907b72b737a4d44f8cfbc43ce3c before 72be1fd5d256dde748c0905c5e1749a119cad5bd; from a425b6e1c69ba907b72b737a4d44f8cfbc43ce3c before c622bbc212207d7c6bbd69dd88f0c3a3f5853d16; from a425b6e1c69ba907b72b737a4d44f8cfbc43ce3c before eca54a092d5f7b497b458ff5a6f66d4f7bfb6674; from a425b6e1c69ba907b72b737a4d44f8cfbc43ce3c before 9f6ad383901d0cb1c8ea5f7f3160fabfe1540eb5; from a425b6e1c69ba907b72b737a4d44f8cfbc43ce3c before 513f7b16ed0cffae9348151c72bed17c7073096f; from a425b6e1c69ba907b72b737a4d44f8cfbc43ce3c before 5d4d985957434867bbe85e4fa5e638f3e48ad522	CNA record

References

References

https://git.kernel.org/stable/c/7cc974799fde846eda2d8f00ad4f8e1810eb0499
https://git.kernel.org/stable/c/8de1e23bd91fe3a6683e4bc574e2d6bcb0eef920
https://git.kernel.org/stable/c/72be1fd5d256dde748c0905c5e1749a119cad5bd
https://git.kernel.org/stable/c/c622bbc212207d7c6bbd69dd88f0c3a3f5853d16
https://git.kernel.org/stable/c/eca54a092d5f7b497b458ff5a6f66d4f7bfb6674
https://git.kernel.org/stable/c/9f6ad383901d0cb1c8ea5f7f3160fabfe1540eb5
https://git.kernel.org/stable/c/513f7b16ed0cffae9348151c72bed17c7073096f
https://git.kernel.org/stable/c/5d4d985957434867bbe85e4fa5e638f3e48ad522

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.