CVE-2020-27675

medium
New! CVE Severity Now Using CVSS v3

The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

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

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=073d0552ead5bfc7a3a9c01de590e924f11b5dd2

https://github.com/torvalds/linux/commit/073d0552ead5bfc7a3a9c01de590e924f11b5dd2

https://xenbits.xen.org/xsa/advisory-331.html

https://lists.fedoraproject.org/archives/list/[email protected]/message/3ZG6TZLD23QO3PV2AN2HB625ZX47ALTT/

https://lists.fedoraproject.org/archives/list/[email protected]/message/GNF2R7FUT4IOJ2RIRGQ7X5R4F4FVVLSR/

https://lists.fedoraproject.org/archives/list/[email protected]/message/6USZ4APZSBQDHGJLJMHW5JBN4QZV6SKZ/

https://security.gentoo.org/glsa/202011-06

https://lists.debian.org/debian-lts-announce/2020/12/msg00015.html

https://lists.debian.org/debian-lts-announce/2020/12/msg00027.html

http://www.openwall.com/lists/oss-security/2021/01/19/3

Details

Source: MITRE

Published: 2020-10-22

Updated: 2021-07-21

Type: CWE-362

Risk Information

CVSS v2

Base Score: 4.7

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

Impact Score: 6.9

Exploitability Score: 3.4

Severity: MEDIUM

CVSS v3

Base Score: 4.7

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

Impact Score: 3.6

Exploitability Score: 1

Severity: MEDIUM

Tenable Plugins

View all (25 total)

IDNameProductFamilySeverity
151307EulerOS Virtualization for ARM 64 3.0.2.0 : kernel (EulerOS-SA-2021-2075)NessusHuawei Local Security Checks
high
147978Ubuntu 20.04 LTS / 20.10 : Linux kernel vulnerabilities (USN-4751-1)NessusUbuntu Local Security Checks
high
147690EulerOS Virtualization 2.9.0 : kernel (EulerOS-SA-2021-1642)NessusHuawei Local Security Checks
high
147512EulerOS Virtualization 2.9.1 : kernel (EulerOS-SA-2021-1604)NessusHuawei Local Security Checks
high
145005Amazon Linux AMI : kernel (ALAS-2021-1461)NessusAmazon Linux Local Security Checks
medium
144752Ubuntu 16.04 LTS : Linux kernel vulnerabilities (USN-4681-1)NessusUbuntu Local Security Checks
high
144750Ubuntu 18.04 LTS / 20.04 LTS : Linux kernel vulnerabilities (USN-4679-1)NessusUbuntu Local Security Checks
medium
144749Ubuntu 16.04 LTS / 18.04 LTS : Linux kernel vulnerabilities (USN-4680-1)NessusUbuntu Local Security Checks
medium
144693EulerOS 2.0 SP9 : kernel (EulerOS-SA-2021-1028)NessusHuawei Local Security Checks
high
144687EulerOS 2.0 SP9 : kernel (EulerOS-SA-2021-1009)NessusHuawei Local Security Checks
high
144494Debian DLA-2494-1 : linux security updateNessusDebian Local Security Checks
high
144464Amazon Linux AMI : kernel (ALAS-2020-1462) (deprecated)NessusAmazon Linux Local Security Checks
high
144168EulerOS 2.0 SP8 : kernel (EulerOS-SA-2020-2514)NessusHuawei Local Security Checks
medium
144097Debian DLA-2483-1 : linux-4.19 security updateNessusDebian Local Security Checks
high
144068Photon OS 3.0: Linux PHSA-2020-3.0-0174NessusPhotonOS Local Security Checks
medium
144062Photon OS 1.0: Linux PHSA-2020-1.0-0345NessusPhotonOS Local Security Checks
medium
143875SUSE SLES15 Security Update : kernel (SUSE-SU-2020:3532-1)NessusSuSE Local Security Checks
high
143857SUSE SLES12 Security Update : kernel (SUSE-SU-2020:3544-1)NessusSuSE Local Security Checks
high
143809SUSE SLED15 / SLES15 Security Update : kernel (SUSE-SU-2020:3272-1)NessusSuSE Local Security Checks
high
143773SUSE SLES12 Security Update : kernel (SUSE-SU-2020:3281-1)NessusSuSE Local Security Checks
high
143589Amazon Linux 2 : kernel (ALAS-2020-1566)NessusAmazon Linux Local Security Checks
medium
142854GLSA-202011-06 : Xen: Multiple vulnerabilitiesNessusGentoo Local Security Checks
high
142338Fedora 33 : kernel (2020-474d747b60)NessusFedora Local Security Checks
medium
142291Fedora 31 : kernel (2020-09e4d062fe)NessusFedora Local Security Checks
medium
142229Fedora 32 : kernel (2020-920a258c79)NessusFedora Local Security Checks
medium