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CVE-2026-97957

Linux: net: hinic: fix mailbox segment buffer overflow

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
8.8High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.14%Chance of exploitation activity in the next 30 days, higher than 3% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in7cc974799fde846eda2d8f00ad4f8e1810eb0499Also 8de1e23bd91fe3a6683e4bc574e2d6bcb0eef920, 72be1fd5d256dde748c0905c5e1749a119cad5bd and 3 moreCVE List
Published25 Sep 2026Updated 19 Oct 2026CVE List

What fixes it

  • 7cc974799fde846eda2d8f00ad4f8e1810eb0499LinuxCVE List
  • 8de1e23bd91fe3a6683e4bc574e2d6bcb0eef920LinuxCVE List
  • 72be1fd5d256dde748c0905c5e1749a119cad5bdLinuxCVE List
  • 9f6ad383901d0cb1c8ea5f7f3160fabfe1540eb5LinuxCVE List
  • 513f7b16ed0cffae9348151c72bed17c7073096fLinuxCVE List
  • 5d4d985957434867bbe85e4fa5e638f3e48ad522LinuxCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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.

Text from CVE List

Affected versions 18

  • Linuxaffected: a425b6e1c69ba907b72b737a4d44f8cfbc43ce3c before 7cc974799fde846eda2d8f00ad4f8e1810eb0499CVE List
  • Linuxaffected: a425b6e1c69ba907b72b737a4d44f8cfbc43ce3c before 8de1e23bd91fe3a6683e4bc574e2d6bcb0eef920CVE List
  • Linuxaffected: a425b6e1c69ba907b72b737a4d44f8cfbc43ce3c before 72be1fd5d256dde748c0905c5e1749a119cad5bdCVE List
  • Linuxaffected: a425b6e1c69ba907b72b737a4d44f8cfbc43ce3c before c622bbc212207d7c6bbd69dd88f0c3a3f5853d16CVE List
  • Linuxaffected: a425b6e1c69ba907b72b737a4d44f8cfbc43ce3c before eca54a092d5f7b497b458ff5a6f66d4f7bfb6674CVE List
  • Linuxaffected: a425b6e1c69ba907b72b737a4d44f8cfbc43ce3c before 9f6ad383901d0cb1c8ea5f7f3160fabfe1540eb5CVE List
  • Linuxaffected: a425b6e1c69ba907b72b737a4d44f8cfbc43ce3c before 513f7b16ed0cffae9348151c72bed17c7073096fCVE List
  • Linuxaffected: a425b6e1c69ba907b72b737a4d44f8cfbc43ce3c before 5d4d985957434867bbe85e4fa5e638f3e48ad522CVE List
  • Linuxaffected: 5.8CVE List
  • Linuxunaffected: all versions before 5.8CVE List
  • Linuxunaffected: 5.10.271 through 5.10.*CVE List
  • Linuxunaffected: 5.15.222 through 5.15.*CVE List
  • Linuxunaffected: 6.1.189 through 6.1.*CVE List
  • Linuxunaffected: 6.6.158 through 6.6.*CVE List
  • Linuxunaffected: 6.12.111 through 6.12.*CVE List
  • Linuxunaffected: 6.18.53 through 6.18.*CVE List
  • Linuxunaffected: 7.2.7 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 8