CVE-2020-36311

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 before 5.9. arch/x86/kvm/svm/sev.c allows attackers to cause a denial of service (soft lockup) by triggering destruction of a large SEV VM (which requires unregistering many encrypted regions), aka CID-7be74942f184.

References

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.9

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7be74942f184fdfba34ddd19a0d995deb34d4a03

https://lists.debian.org/debian-lts-announce/2021/07/msg00015.html

Details

Source: MITRE

Published: 2021-04-07

Updated: 2021-07-21

Risk Information

CVSS v2

Base Score: 2.1

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

Impact Score: 2.9

Exploitability Score: 3.9

Severity: LOW

CVSS v3

Base Score: 5.5

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

Impact Score: 3.6

Exploitability Score: 1.8

Severity: MEDIUM

Vulnerable Software

Configuration 1

OR

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

Tenable Plugins

View all (26 total)

IDNameProductFamilySeverity
154338Ubuntu 20.04 LTS : Linux kernel (Azure) vulnerabilities (USN-5120-1)NessusUbuntu Local Security Checks
high
153445Ubuntu 18.04 LTS : Linux kernel (HWE) vulnerabilities (USN-5071-2)NessusUbuntu Local Security Checks
high
153443Oracle Linux 7 / 8 : Unbreakable Enterprise kernel-container (ELSA-2021-9451)NessusOracle Linux Local Security Checks
medium
153442Oracle Linux 7 / 8 : Unbreakable Enterprise kernel (ELSA-2021-9450)NessusOracle Linux Local Security Checks
medium
153178Ubuntu 18.04 LTS / 20.04 LTS : Linux kernel vulnerabilities (USN-5071-1)NessusUbuntu Local Security Checks
high
153148Debian DLA-2714-1 : linux-4.19 - LTS security updateNessusDebian Local Security Checks
high
152388Photon OS 3.0: Linux PHSA-2021-3.0-0278NessusPhotonOS Local Security Checks
high
152313EulerOS 2.0 SP9 : kernel (EulerOS-SA-2021-2272)NessusHuawei Local Security Checks
high
151890Debian DSA-4941-1 : linux - security updateNessusDebian Local Security Checks
medium
151756openSUSE 15 Security Update : kernel (openSUSE-SU-2021:1977-1)NessusSuSE Local Security Checks
critical
151730openSUSE 15 Security Update : kernel (openSUSE-SU-2021:1975-1)NessusSuSE Local Security Checks
critical
151562EulerOS Virtualization 2.9.1 : kernel (EulerOS-SA-2021-2183)NessusHuawei Local Security Checks
high
151307EulerOS Virtualization for ARM 64 3.0.2.0 : kernel (EulerOS-SA-2021-2075)NessusHuawei Local Security Checks
high
151238EulerOS 2.0 SP9 : kernel (EulerOS-SA-2021-2051)NessusHuawei Local Security Checks
high
151042EulerOS 2.0 SP8 : kernel (EulerOS-SA-2021-1983)NessusHuawei Local Security Checks
high
150927SUSE SLES15 Security Update : kernel (SUSE-SU-2021:1975-1)NessusSuSE Local Security Checks
critical
150901SUSE SLED15 / SLES15 Security Update : kernel (SUSE-SU-2021:1977-1)NessusSuSE Local Security Checks
critical
149892openSUSE Security Update : the Linux Kernel (openSUSE-2021-758)NessusSuSE Local Security Checks
critical
149717SUSE SLES15 Security Update : kernel (SUSE-SU-2021:1624-1)NessusSuSE Local Security Checks
high
149605openSUSE Security Update : the Linux Kernel (openSUSE-2021-579)NessusSuSE Local Security Checks
high
149491SUSE SLES12 Security Update : kernel (SUSE-SU-2021:1596-1)NessusSuSE Local Security Checks
high
149462SUSE SLES15 Security Update : kernel (SUSE-SU-2021:1573-1)NessusSuSE Local Security Checks
high
148753SUSE SLES12 Security Update : kernel (SUSE-SU-2021:1248-1)NessusSuSE Local Security Checks
high
148747SUSE SLED15 / SLES15 Security Update : kernel (SUSE-SU-2021:1238-1)NessusSuSE Local Security Checks
critical
148700SUSE SLES12 Security Update : kernel (SUSE-SU-2021:1210-1)NessusSuSE Local Security Checks
high
148698SUSE SLES15 Security Update : kernel (SUSE-SU-2021:1211-1)NessusSuSE Local Security Checks
critical