SB20260816515 - Out-of-bounds write in Linux kernel smc

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds write (CVE-ID: CVE-2026-72018)

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

CVSSv4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to perform an out-of-bounds write in kernel memory.

The vulnerability exists due to out-of-bounds write in smc_lo_move_data() when processing peer-supplied offset and size values. A remote attacker can send crafted data parameters to perform an out-of-bounds write in kernel memory.

The issue affects the software loopback implementation, which does not enforce memory region bounds like real ISM hardware.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/78237e3c0720fcc6eb9b87e90fd70f63eeca886f
• https://git.kernel.org/stable/c/94fe0ab01b480b52bd8f977edbd845ef375d69fd
• https://git.kernel.org/stable/c/b2f426a9a22886071966432ede8fceafffe12b8c
• https://git.kernel.org/stable/c/ee188a6b264b71315a67f1b9470faad308b730d2