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CVE-2020-27675

Public on 2020-10-22
Modified on 2021-01-13
Description

An issue was discovered in the Linux kernel through 5.9.1, as used with Xen through 4.14.x. drivers/xen/events/events_base.c allows event-channel removal during the event-handling loop (a race condition). This can cause a use-after-free or NULL pointer dereference, as demonstrated by a dom0 crash via events for an in-reconfiguration paravirtualized device, aka CID-073d0552ead5.

Severity
Medium
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CVSS v3 Base Score
4.7
See breakdown
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Affected Packages

Platform Package Release Date Advisory
Amazon Linux 1 kernel 2021-01-12 22:51 ALAS-2021-1461
Amazon Linux 2 - Core kernel 2020-12-08 20:55 ALAS2-2020-1566
Amazon Linux 2 - Kernel-5.4 Extra kernel 2022-01-20 19:50 ALAS2KERNEL-5.4-2022-018

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Amazon Linux CVSSv2 4.7 AV:L/AC:M/Au:N/C:N/I:N/A:C
NVD CVSSv2 4.7 AV:L/AC:M/Au:N/C:N/I:N/A:C
NVD CVSSv3 4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H