CVE-2021-28691

Published: Jun 29, 2021Modified: Jun 17, 2026

7.8

Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploitability: 1.8 / Impact: 5.9

Source: NVD

Description

Guest triggered use-after-free in Linux xen-netback A malicious or buggy network PV frontend can force Linux netback to disable the interface and terminate the receive kernel thread associated with queue 0 in response to the frontend sending a malformed packet. Such kernel thread termination will lead to a use-after-free in Linux netback when the backend is destroyed, as the kernel thread associated with queue 0 will have already exited and thus the call to kthread_stop will be performed against a stale pointer.

Affected (10)

Products: Linux: Linux Kernel · Netapp: Cloud Backup, H410c Firmware, H300s Firmware, H500s Firmware, H700s Firmware, H300e Firmware, H500e Firmware, H700e Firmware, H410s Firmware

1 product

9 products

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Linux Linux Kernel	From 5.5.0 to 5.12.2

Configuration B

1 vulnerable

Vulnerable Software	Affected Versions
Netapp Cloud Backup	All versions

Configuration C

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Netapp H410c Firmware	All versions

Running on/with	Platform Versions
Netapp H410c	All versions

Configuration D

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Netapp H300s Firmware	All versions

Running on/with	Platform Versions
Netapp H300s	All versions

Configuration E

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Netapp H500s Firmware	All versions

Running on/with	Platform Versions
Netapp H500s	All versions

Configuration F

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Netapp H700s Firmware	All versions

Running on/with	Platform Versions
Netapp H700s	All versions

Configuration G

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Netapp H300e Firmware	All versions

Running on/with	Platform Versions
Netapp H300e	All versions

Configuration H

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Netapp H500e Firmware	All versions

Running on/with	Platform Versions
Netapp H500e	All versions

Configuration I

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Netapp H700e Firmware	All versions

Running on/with	Platform Versions
Netapp H700e	All versions

Configuration J

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Netapp H410s Firmware	All versions

Running on/with	Platform Versions
Netapp H410s	All versions

Related CWEs

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.

References (6)

https://security.gentoo.org/glsa/202107-30

Source: security@xen.org

Third Party Advisory

https://security.netapp.com/advisory/ntap-20210805-0002/

Source: security@xen.org

Third Party Advisory

https://xenbits.xenproject.org/xsa/advisory-374.txt

Source: security@xen.org

Third Party Advisory

https://security.gentoo.org/glsa/202107-30

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

https://security.netapp.com/advisory/ntap-20210805-0002/

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

https://xenbits.xenproject.org/xsa/advisory-374.txt

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

Timeline

No history available yet.