SB20260812418 - Out-of-bounds write in Linux kernel net mctp driver

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Main Vulnerability Database SB20260812418

SB20260812418 - Out-of-bounds write in Linux kernel net mctp driver

Published: August 12, 2026

Security Bulletin ID SB20260812418
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Data manipulation

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Out-of-bounds write (CVE-ID: CVE-2026-68124)

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local privileged user to perform out-of-bounds heap writes.

The vulnerability exists due to an out-of-bounds write in the MCTP serial receive state machine in drivers/net/mctp/mctp-serial.c when processing a zero-length MCTP serial frame. A local privileged user can send a specially crafted zero-length frame followed by data bytes to perform out-of-bounds heap writes.

Exploitation requires attaching the N_MCTP line discipline and bringing the resulting mctpserial network device up before sending bytes through the tty receive path.


Remediation

Install update from vendor's website.

References