CVE-2020-27171

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 5.11.8. kernel/bpf/verifier.c has an off-by-one error (with a resultant integer underflow) affecting 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-10d2bb2e6b1d.

References

http://packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.html

http://www.openwall.com/lists/oss-security/2021/03/24/5

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.8

https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/patch/?id=10d2bb2e6b1d8c4576c56a748f697dbeb8388899

https://lists.debian.org/debian-lts-announce/2021/03/msg00035.html

https://lists.fedoraproject.org/archives/list/[email protected]/message/FB6LUXPEIRLZH32YXWZVEZAD4ZL6SDK2/

https://lists.fedoraproject.org/archives/list/[email protected]/message/QRTPQE73ANG7D6M4L4PK5ZQDPO4Y2FVD/

https://lists.fedoraproject.org/archives/list/[email protected]/message/T2S3I4SLRNRUQDOFYUS6IUAZMQNMPNLG/

https://www.openwall.com/lists/oss-security/2021/03/19/3

Details

Source: MITRE

Published: 2021-03-20

Updated: 2021-04-08

Type: CWE-193

Risk Information

CVSS v2

Base Score: 3.6

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

Impact Score: 4.9

Exploitability Score: 3.9

Severity: LOW

CVSS v3

Base Score: 6

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

Impact Score: 5.2

Exploitability Score: 0.8

Severity: MEDIUM

Tenable Plugins

View all (30 total)

IDNameProductFamilySeverity
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
151307EulerOS Virtualization for ARM 64 3.0.2.0 : kernel (EulerOS-SA-2021-2075)NessusHuawei Local Security Checks
high
151240EulerOS 2.0 SP9 : kernel (EulerOS-SA-2021-2062)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
150271EulerOS Virtualization 2.9.1 : kernel (EulerOS-SA-2021-1967)NessusHuawei Local Security Checks
high
150253EulerOS Virtualization 2.9.0 : kernel (EulerOS-SA-2021-1971)NessusHuawei Local Security Checks
high
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
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
149421Oracle Linux 7 : Unbreakable Enterprise kernel (ELSA-2021-9222)NessusOracle Linux Local Security Checks
high
149420Oracle Linux 7 : Unbreakable Enterprise kernel-container (ELSA-2021-9223)NessusOracle Linux Local Security Checks
high
148919Amazon Linux 2 : kernel (ALAS-2021-1627)NessusAmazon Linux 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
148509SUSE SLES12 Security Update : kernel (SUSE-SU-2021:1175-1)NessusSuSE Local Security Checks
medium
148459Oracle Linux 7 / 8 : Unbreakable Enterprise kernel (ELSA-2021-9140)NessusOracle Linux Local Security Checks
high
148458Oracle Linux 7 / 8 : Unbreakable Enterprise kernel-container (ELSA-2021-9141)NessusOracle Linux Local Security Checks
high
148438openSUSE Security Update : the Linux Kernel (openSUSE-2021-532)NessusSuSE Local Security Checks
critical
148350Photon OS 4.0: Linux PHSA-2021-4.0-0007NessusPhotonOS Local Security Checks
high
148254Debian DLA-2610-1 : linux-4.19 security updateNessusDebian Local Security Checks
high
148205Fedora 32 : kernel (2021-9503fffad9)NessusFedora Local Security Checks
high
148108Ubuntu 16.04 LTS / 18.04 LTS : Linux kernel vulnerabilities (USN-4890-1)NessusUbuntu Local Security Checks
medium
148051Fedora 33 : kernel (2021-e49da8a226)NessusFedora Local Security Checks
medium
148034Ubuntu 18.04 LTS / 20.04 LTS / 20.10 : Linux kernel vulnerabilities (USN-4887-1)NessusUbuntu Local Security Checks
high