CVE-2020-27170medium
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 5.11.8. kernel/bpf/verifier.c performs undesirable out-of-bounds speculation on pointer arithmetic, leading to side-channel attacks that defeat Spectre mitigations and obtain sensitive information from kernel memory, aka CID-f232326f6966. This affects pointer types that do not define a ptr_limit.
References
http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.html
http://www.openwall.com/lists/oss-security/2021/03/24/4
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.8
https://lists.debian.org/debian-lts-announce/2021/03/msg00035.html
Details
Source: MITRE
Published: 2021-03-20
Updated: 2021-04-08
Type: CWE-203
Risk Information
CVSS v2
Base Score: 1.9
Vector: AV:L/AC:M/Au:N/C:P/I:N/A:N
Impact Score: 2.9
Exploitability Score: 3.4
Severity: LOW
CVSS v3
Base Score: 4.7
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Impact Score: 3.6
Exploitability Score: 1
Severity: MEDIUM
Vulnerable Software
Configuration 1
OR
Configuration 2
OR
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
Tenable Plugins
| ID | Name | Product | Family | Severity |
|---|---|---|---|---|
| 151756 | openSUSE 15 Security Update : kernel (openSUSE-SU-2021:1977-1) | Nessus | SuSE Local Security Checks | critical |
| 151730 | openSUSE 15 Security Update : kernel (openSUSE-SU-2021:1975-1) | Nessus | SuSE Local Security Checks | critical |
| 151307 | EulerOS Virtualization for ARM 64 3.0.2.0 : kernel (EulerOS-SA-2021-2075) | Nessus | Huawei Local Security Checks | high |
| 151240 | EulerOS 2.0 SP9 : kernel (EulerOS-SA-2021-2062) | Nessus | Huawei Local Security Checks | high |
| 151042 | EulerOS 2.0 SP8 : kernel (EulerOS-SA-2021-1983) | Nessus | Huawei Local Security Checks | high |
| 150927 | SUSE SLES15 Security Update : kernel (SUSE-SU-2021:1975-1) | Nessus | SuSE Local Security Checks | critical |
| 150901 | SUSE SLED15 / SLES15 Security Update : kernel (SUSE-SU-2021:1977-1) | Nessus | SuSE Local Security Checks | critical |
| 150800 | Scientific Linux Security Update : kernel on SL7.x x86_64 (2021:2314) | Nessus | Scientific Linux Local Security Checks | high |
| 150770 | CentOS 7 : kernel (CESA-2021:2314) | Nessus | CentOS Local Security Checks | high |
| 150447 | Oracle Linux 7 : kernel (ELSA-2021-2314) | Nessus | Oracle Linux Local Security Checks | high |
| 150380 | RHEL 7 : kernel-rt (RHSA-2021:2316) | Nessus | Red Hat Local Security Checks | high |
| 150379 | RHEL 7 : kernel (RHSA-2021:2314) | Nessus | Red Hat Local Security Checks | high |
| 150271 | EulerOS Virtualization 2.9.1 : kernel (EulerOS-SA-2021-1967) | Nessus | Huawei Local Security Checks | high |
| 149892 | openSUSE Security Update : the Linux Kernel (openSUSE-2021-758) | Nessus | SuSE Local Security Checks | critical |
| 149717 | SUSE SLES15 Security Update : kernel (SUSE-SU-2021:1624-1) | Nessus | SuSE Local Security Checks | high |
| 149491 | SUSE SLES12 Security Update : kernel (SUSE-SU-2021:1596-1) | Nessus | SuSE Local Security Checks | high |
| 149462 | SUSE SLES15 Security Update : kernel (SUSE-SU-2021:1573-1) | Nessus | SuSE Local Security Checks | high |
| 149421 | Oracle Linux 7 : Unbreakable Enterprise kernel (ELSA-2021-9222) | Nessus | Oracle Linux Local Security Checks | high |
| 149420 | Oracle Linux 7 : Unbreakable Enterprise kernel-container (ELSA-2021-9223) | Nessus | Oracle Linux Local Security Checks | high |
| 148747 | SUSE SLED15 / SLES15 Security Update : kernel (SUSE-SU-2021:1238-1) | Nessus | SuSE Local Security Checks | critical |
| 148700 | SUSE SLES12 Security Update : kernel (SUSE-SU-2021:1210-1) | Nessus | SuSE Local Security Checks | high |
| 148698 | SUSE SLES15 Security Update : kernel (SUSE-SU-2021:1211-1) | Nessus | SuSE Local Security Checks | critical |
| 148509 | SUSE SLES12 Security Update : kernel (SUSE-SU-2021:1175-1) | Nessus | SuSE Local Security Checks | medium |
| 148459 | Oracle Linux 7 / 8 : Unbreakable Enterprise kernel (ELSA-2021-9140) | Nessus | Oracle Linux Local Security Checks | high |
| 148458 | Oracle Linux 7 / 8 : Unbreakable Enterprise kernel-container (ELSA-2021-9141) | Nessus | Oracle Linux Local Security Checks | high |
| 148438 | openSUSE Security Update : the Linux Kernel (openSUSE-2021-532) | Nessus | SuSE Local Security Checks | critical |
| 148350 | Photon OS 4.0: Linux PHSA-2021-4.0-0007 | Nessus | PhotonOS Local Security Checks | high |
| 148254 | Debian DLA-2610-1 : linux-4.19 security update | Nessus | Debian Local Security Checks | high |
| 148205 | Fedora 32 : kernel (2021-9503fffad9) | Nessus | Fedora Local Security Checks | high |
| 148108 | Ubuntu 16.04 LTS / 18.04 LTS : Linux kernel vulnerabilities (USN-4890-1) | Nessus | Ubuntu Local Security Checks | medium |
| 148051 | Fedora 33 : kernel (2021-e49da8a226) | Nessus | Fedora Local Security Checks | medium |
| 148034 | Ubuntu 18.04 LTS / 20.04 LTS / 20.10 : Linux kernel vulnerabilities (USN-4887-1) | Nessus | Ubuntu Local Security Checks | high |