CVE-2020-27675

MEDIUM

Linux Kernel < 5.9.1 - Race Condition

Title source: rule
STIX 2.1

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.

References (10)

Core 10
Core References
Patch, Vendor Advisory x_refsource_misc
https://xenbits.xen.org/xsa/advisory-331.html
Third Party Advisory vendor-advisory x_refsource_gentoo
https://security.gentoo.org/glsa/202011-06
Mailing List, Third Party Advisory mailing-list x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2020/12/msg00015.html
Mailing List, Third Party Advisory mailing-list x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2020/12/msg00027.html
Mailing List, Third Party Advisory mailing-list x_refsource_mlist
http://www.openwall.com/lists/oss-security/2021/01/19/3

Scores

CVSS v3 4.7
EPSS 0.0006
EPSS Percentile 19.0%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Details

CWE
CWE-362 CWE-476 CWE-416
Status published
Products (5)
debian/debian_linux 9.0
fedoraproject/fedora 31
fedoraproject/fedora 32
fedoraproject/fedora 33
linux/linux_kernel < 5.9.1
Published Oct 22, 2020
Tracked Since Feb 18, 2026