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ubuntucveUbuntu.comUB:CVE-2020-27675
HistoryOct 22, 2020 - 12:00 a.m.

CVE-2020-27675

2020-10-2200:00:00
ubuntu.com
ubuntu.com
9

4.7 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

4.7 Medium

CVSS2

Access Vector

LOCAL

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

AV:L/AC:M/Au:N/C:N/I:N/A:C

0.0004 Low

EPSS

Percentile

13.3%

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.

OSVersionArchitecturePackageVersionFilename
ubuntu20.04noarchlinux-riscv-5.8< 5.8.0-17.19~20.04.1UNKNOWN
ubuntu20.04noarchlinux-bluefield< 5.4.0-1011.14UNKNOWN
ubuntu18.04noarchlinux-hwe-5.4< 5.4.0-59.65~18.04.1UNKNOWN
ubuntu18.04noarchlinux-kvm< 4.15.0-1082.84UNKNOWN
ubuntu16.04noarchlinux-kvm< 4.4.0-1085.94UNKNOWN
ubuntu20.04noarchlinux-kvm< 5.4.0-1031.32UNKNOWN
ubuntu20.10noarchlinux-kvm< 5.8.0-1019.21UNKNOWN
ubuntu14.04noarchlinux-lts-xenial< 4.4.0-198.230~14.04.1) Available with Ubuntu Pro or Ubuntu Pro (Infra-onlyUNKNOWN
ubuntu18.04noarchlinux-aws< 4.15.0-1091.96UNKNOWN
ubuntu20.04noarchlinux-aws< 5.4.0-1034.35UNKNOWN
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4.7 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

4.7 Medium

CVSS2

Access Vector

LOCAL

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

AV:L/AC:M/Au:N/C:N/I:N/A:C

0.0004 Low

EPSS

Percentile

13.3%