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CVE-2021-28691

Public on 2021-06-29
Modified on 2022-01-10
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.

Severity
Important
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CVSS v3 Base Score
7.8
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Affected Packages

Platform Package Release Date Advisory
Amazon Linux 2 - Kernel-5.10 Extra kernel 2022-01-20 23:37 ALAS2KERNEL-5.10-2022-002

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv2 4.6 AV:L/AC:L/Au:N/C:P/I:P/A:P
Amazon Linux CVSSv3 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD CVSSv2 4.6 AV:L/AC:L/Au:N/C:P/I:P/A:P
NVD CVSSv3 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Red Hat: CVE-2021-28691 Mitre: CVE-2021-28691 FAQs regarding Amazon Linux ALAS/CVE Severity