CVE-2021-47596

Description

In the Linux kernel, the following vulnerability has been resolved: net: hns3: fix use-after-free bug in hclgevf_send_mbx_msg Currently, the hns3_remove function firstly uninstall client instance, and then uninstall acceletion engine device. The netdevice is freed in client instance uninstall process, but acceletion engine device uninstall process still use it to trace runtime information. This causes a use after free problem. So fixes it by check the instance register state to avoid use after free.

CVSS Metrics

• v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.02%• Percentile: 4%

Techniques & Countermeasures

• CWE-416•Use After Free

  The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Affected Systems

• linux•linux

  ≥ d8355240cf8fb8b9e002b5c8458578435cea85c2, < 12512bc8f25b8ba9795dfbae0e9ca57ff13fd542 | ≥ d8355240cf8fb8b9e002b5c8458578435cea85c2, < 4f4a353f6fe033807cd026a5de81c67469ff19b0 | ≥ d8355240cf8fb8b9e002b5c8458578435cea85c2, < 27cbf64a766e86f068ce6214f04c00ceb4db1af4 | 5.8

• linux•linux_kernel

  ≥ 5.8, < 5.10.88 | ≥ 5.11, < 5.15.11

References (3)

• https://git.kernel.org/stable/c/12512bc8f25b8ba9795dfbae0e9ca57ff13fd542
• https://git.kernel.org/stable/c/4f4a353f6fe033807cd026a5de81c67469ff19b0
• https://git.kernel.org/stable/c/27cbf64a766e86f068ce6214f04c00ceb4db1af4