CVE-2021-29155

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 5.11.x. 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. Specifically, for sequences of pointer arithmetic operations, the pointer modification performed by the first operation is not correctly accounted for when restricting subsequent operations.

References

https://www.kernel.org

https://www.openwall.com/lists/oss-security/2021/04/18/4

https://lists.fedoraproject.org/archives/list/[email protected]/message/PAEQ3H6HKNO6KUCGRZVYSFSAGEUX23JL/

https://lists.fedoraproject.org/archives/list/[email protected]/message/CUX2CA63453G34C6KYVBLJXJXEARZI2X/

https://lists.fedoraproject.org/archives/list/[email protected]/message/XZASHZVCOFJ4VU2I3BN5W5EPHWJQ7QWX/

https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html

Details

Source: MITRE

Published: 2021-04-20

Updated: 2021-06-23

Type: CWE-125

Risk Information

CVSS v2

Base Score: 2.1

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

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:H/I:N/A:N

Impact Score: 3.6

Exploitability Score: 1.8

Severity: MEDIUM

Tenable Plugins

View all (33 total)

IDNameProductFamilySeverity
155425Oracle Linux 8 : kernel (ELSA-2021-4356)NessusOracle Linux Local Security Checks
high
155219RHEL 8 : kernel (RHSA-2021:4356)NessusRed Hat Local Security Checks
high
155172RHEL 8 : kernel-rt (RHSA-2021:4140)NessusRed Hat Local Security Checks
high
155145CentOS 8 : kernel (CESA-2021:4356)NessusCentOS Local Security Checks
high
155070CentOS 8 : kernel-rt (CESA-2021:4140)NessusCentOS Local Security Checks
high
152327EulerOS 2.0 SP8 : kernel (EulerOS-SA-2021-2301)NessusHuawei Local Security Checks
high
152313EulerOS 2.0 SP9 : kernel (EulerOS-SA-2021-2272)NessusHuawei Local Security Checks
high
152308EulerOS 2.0 SP9 : kernel (EulerOS-SA-2021-2246)NessusHuawei Local Security Checks
high
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
151690Oracle Linux 7 / 8 : Unbreakable Enterprise kernel (ELSA-2021-9362)NessusOracle Linux Local Security Checks
high
151689Oracle Linux 7 / 8 : Unbreakable Enterprise kernel-container (ELSA-2021-9363)NessusOracle Linux Local Security Checks
high
151570EulerOS Virtualization 2.9.0 : kernel (EulerOS-SA-2021-2195)NessusHuawei Local Security Checks
high
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
151080openSUSE 15 Security Update : kernel (openSUSE-SU-2021:0873-1)NessusSuSE Local Security Checks
medium
150984Debian DLA-2690-1 : linux-4.19 security updateNessusDebian Local Security Checks
high
150954Ubuntu 20.04 LTS / 20.10 : Linux kernel vulnerabilities (USN-4999-1)NessusUbuntu 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
150476SUSE SLES15 Security Update : kernel (SUSE-SU-2021:1915-1)NessusSuSE Local Security Checks
medium
150234Ubuntu 20.04 LTS : Linux kernel (OEM) vulnerabilities (USN-4983-1)NessusUbuntu Local Security Checks
high
150151Ubuntu 21.04 : Linux kernel vulnerabilities (USN-4977-1)NessusUbuntu Local Security Checks
high
149872Amazon Linux AMI : kernel (ALAS-2021-1503)NessusAmazon Linux Local Security Checks
high
149870Amazon Linux 2 : kernel (ALAS-2021-1636)NessusAmazon Linux Local Security Checks
high
149717SUSE SLES15 Security Update : kernel (SUSE-SU-2021:1624-1)NessusSuSE Local Security Checks
high
149584openSUSE Security Update : the Linux Kernel (openSUSE-2021-716)NessusSuSE Local Security Checks
medium
149491SUSE SLES12 Security Update : kernel (SUSE-SU-2021:1596-1)NessusSuSE Local Security Checks
high
149487SUSE SLES12 Security Update : kernel (SUSE-SU-2021:1595-1)NessusSuSE Local Security Checks
high
149463SUSE SLED15 / SLES15 Security Update : kernel (SUSE-SU-2021:1574-1)NessusSuSE Local Security Checks
medium
149462SUSE SLES15 Security Update : kernel (SUSE-SU-2021:1573-1)NessusSuSE Local Security Checks
high
149457SUSE SLES15 Security Update : kernel (SUSE-SU-2021:1571-1)NessusSuSE Local Security Checks
medium
149456SUSE SLES12 Security Update : kernel (SUSE-SU-2021:1572-1)NessusSuSE Local Security Checks
high