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.

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Advisories
Source ID Title
EUVD EUVD EUVD-2021-15348 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.
Ubuntu USN Ubuntu USN USN-5015-1 Linux kernel (OEM) vulnerabilities
Ubuntu USN Ubuntu USN USN-5046-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-5050-1 Linux kernel vulnerabilities
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Wed, 26 Aug 2026 18:15:00 +0000

Type Values Removed Values Added
First Time appeared Netapp solidfire Baseboard Management Controller
CPEs cpe:2.3:a:netapp:solidfire_baseboard_management_controller:-:*:*:*:*:*:*:*
Vendors & Products Netapp solidfire Baseboard Management Controller

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: XEN

Published:

Updated: 2024-08-03T21:47:33.196Z

Reserved: 2021-03-18T00:00:00.000Z

Link: CVE-2021-28691

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Analyzed

Published: 2021-06-29T12:15:08.543

Modified: 2026-08-26T17:57:08.287

Link: CVE-2021-28691

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses