CVE-2021-47596
kernel: net: hns3: fix use-after-free bug in hclgevf_send_mbx_msg
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · June 19, 2024
Updated · November 21, 2025
Description
A vulnerability was found in the Linux kernel's HNS3 network driver related to a use-after-free condition in the hclgevf_send_mbx_msg function. The issue occurs when the hns3_remove function uninstalls a client instance before uninstalling the acceleration engine device, leading to access of freed memory during the device's uninstall process, resulting in system crash.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
CVSS / CWE
CVSS 3.1 · 7.3CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H
CWE-416 · Use After Free