CVE-2026-97957 Linux kernel hinic - Buffer Overflow

Linux kernel hinic driver contains a heap buffer overflow caused by improper validation of mailbox segment length in check_mbox_seq_id_and_seg_len(), letting attackers cause memory corruption remotely, exploit requires crafted mailbox messages.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.14% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Buffer Overflow
Impact
Denial Of Service, Remote Code Execution
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Published
25 September 2026
Updated
15 October 2026

Vendor fix

Update to the Linux kernel version with the hinic driver fix that properly validates mailbox segment length.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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