CVE-2021-33624

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

In kernel/bpf/verifier.c in the Linux kernel before 5.12.13, a branch can be mispredicted (e.g., because of type confusion) and consequently an unprivileged BPF program can read arbitrary memory locations via a side-channel attack, aka CID-9183671af6db.

References

https://www.usenix.org/conference/usenixsecurity21/presentation/kirzner

http://www.openwall.com/lists/oss-security/2021/06/21/1

https://github.com/torvalds/linux/commit/9183671af6dbf60a1219371d4ed73e23f43b49db

https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html

Details

Source: MITRE

Published: 2021-06-23

Updated: 2021-11-12

Type: CWE-203

Risk Information

CVSS v2

Base Score: 4.7

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

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:H/I:N/A:N

Impact Score: 3.6

Exploitability Score: 1

Severity: MEDIUM

Tenable Plugins

View all (24 total)

IDNameProductFamilySeverity
156347EulerOS Virtualization 3.0.2.0 : kernel (EulerOS-SA-2021-2818)NessusHuawei Local Security Checks
high
154279Ubuntu 20.04 LTS : Linux kernel (OEM) vulnerabilities (USN-5115-1)NessusUbuntu Local Security Checks
high
153801Ubuntu 18.04 LTS / 20.04 LTS : Linux kernel (Raspberry Pi) vulnerabilities (USN-5091-2)NessusUbuntu Local Security Checks
high
153799Ubuntu 20.04 LTS / 21.04 : Linux kernel vulnerabilities (USN-5092-2)NessusUbuntu Local Security Checks
high
153770Ubuntu 20.04 LTS : Linux kernel vulnerabilities (USN-5092-1)NessusUbuntu Local Security Checks
high
153769Ubuntu 20.04 LTS : Linux kernel vulnerabilities (USN-5091-1)NessusUbuntu Local Security Checks
high
153703EulerOS 2.0 SP9 : kernel (EulerOS-SA-2021-2530)NessusHuawei Local Security Checks
high
153610EulerOS 2.0 SP8 : kernel (EulerOS-SA-2021-2465)NessusHuawei Local Security Checks
high
153499Photon OS 3.0: Linux PHSA-2021-3.0-0302NessusPhotonOS Local Security Checks
medium
151998SUSE SLES12 Security Update : kernel (SUSE-SU-2021:2422-1)NessusSuSE Local Security Checks
high
151996SUSE SLES15 Security Update : kernel (SUSE-SU-2021:2426-1)NessusSuSE Local Security Checks
medium
151989SUSE SLES15 Security Update : kernel (SUSE-SU-2021:2427-1)NessusSuSE Local Security Checks
high
151986SUSE SLES15 Security Update : kernel (SUSE-SU-2021:2421-1)NessusSuSE Local Security Checks
high
151935openSUSE 15 Security Update : kernel (openSUSE-SU-2021:2427-1)NessusSuSE Local Security Checks
high
151793Amazon Linux 2 : kernel (ALAS-2021-1685)NessusAmazon Linux Local Security Checks
medium
151760SUSE SLED15 / SLES15 Security Update : kernel (SUSE-SU-2021:2352-1)NessusSuSE Local Security Checks
medium
151754openSUSE 15 Security Update : kernel (openSUSE-SU-2021:2305-1)NessusSuSE Local Security Checks
medium
151691openSUSE 15 Security Update : kernel (openSUSE-SU-2021:2352-1)NessusSuSE Local Security Checks
medium
151658SUSE SLES12 Security Update : kernel (SUSE-SU-2021:2349-1)NessusSuSE Local Security Checks
high
151653SUSE SLED12 / SLES12 Security Update : kernel (SUSE-SU-2021:2324-1)NessusSuSE Local Security Checks
high
151652SUSE SLED15 / SLES15 Security Update : kernel (SUSE-SU-2021:2325-1)NessusSuSE Local Security Checks
medium
151649SUSE SLES12 Security Update : kernel (SUSE-SU-2021:2321-1)NessusSuSE Local Security Checks
high
151617SUSE SLES15 Security Update : kernel (SUSE-SU-2021:2303-1)NessusSuSE Local Security Checks
medium
151616SUSE SLES15 Security Update : kernel (SUSE-SU-2021:2305-1)NessusSuSE Local Security Checks
medium