SB2026082756 - Out-of-bounds write in Linux kernel s390 net driver

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Main Vulnerability Database SB2026082756

SB2026082756 - Out-of-bounds write in Linux kernel s390 net driver

Published: August 27, 2026

Security Bulletin ID SB2026082756
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Code execution

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-2026-80584)

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

CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to an out-of-bounds write in the qeth SNMP and ARP query ioctl handlers when processing user-supplied buffer lengths. A remote attacker can supply a crafted length value that causes an integer underflow in a bounds check and trigger a memcpy() past the allocated buffer to execute arbitrary code.

The issue occurs because a user-supplied length smaller than the fixed offset can wrap a u32 subtraction, and a zero-length allocation can also result in an invalid zero-sized buffer.


Remediation

Install update from vendor's website.

References