SB2026081637 - Out-of-bounds write in Linux kernel core en driver

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Main Vulnerability Database SB2026081637

SB2026081637 - Out-of-bounds write in Linux kernel core en driver

Published: August 16, 2026

Security Bulletin ID SB2026081637
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

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-2026-72343)

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

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


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to an out-of-bounds write in mlx5e_hv_vhca_stats_work() and mlx5e_hv_vhca_stats_create() when handling hypervisor VHCA statistics after channel initialization. A local user can trigger stats handling with an incorrectly sized buffer to cause a denial of service.

The issue can result from a zero-sized allocation that leaves the buffer pointer set to ZERO_SIZE_PTR, and may also occur across a detach and resume cycle when buffer sizing becomes smaller than the persisted channel count.


Remediation

Install update from vendor's website.

References