CVE-2021-3444

high
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

The bpf verifier in the Linux kernel did not properly handle mod32 destination register truncation when the source register was known to be 0. A local attacker with the ability to load bpf programs could use this gain out-of-bounds reads in kernel memory leading to information disclosure (kernel memory), and possibly out-of-bounds writes that could potentially lead to code execution. This issue was addressed in the upstream kernel in commit 9b00f1b78809 ("bpf: Fix truncation handling for mod32 dst reg wrt zero") and in Linux stable kernels 5.11.2, 5.10.19, and 5.4.101.

References

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9b00f1b78809

https://www.openwall.com/lists/oss-security/2021/03/23/2

http://www.openwall.com/lists/oss-security/2021/03/23/2

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

https://security.netapp.com/advisory/ntap-20210416-0006/

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

http://packetstormsecurity.com/files/164950/Kernel-Live-Patch-Security-Notice-LSN-0082-1.html

Details

Source: MITRE

Published: 2021-03-23

Updated: 2021-12-02

Type: CWE-125

Risk Information

CVSS v2

Base Score: 4.6

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

Impact Score: 6.4

Exploitability Score: 3.9

Severity: MEDIUM

CVSS v3

Base Score: 7.8

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

Impact Score: 5.9

Exploitability Score: 1.8

Severity: HIGH

Tenable Plugins

View all (26 total)

IDNameProductFamilySeverity
153610EulerOS 2.0 SP8 : kernel (EulerOS-SA-2021-2465)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
152167SUSE SLES15 Security Update : kernel (Live Patch 15 for SLE 15 SP2) (SUSE-SU-2021:2577-1)NessusSuSE 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
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
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
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
149462SUSE SLES15 Security Update : kernel (SUSE-SU-2021:1573-1)NessusSuSE Local Security Checks
high
149456SUSE SLES12 Security Update : kernel (SUSE-SU-2021:1572-1)NessusSuSE Local Security Checks
high
149283Photon OS 3.0: Linux PHSA-2021-3.0-0229NessusPhotonOS 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
148034Ubuntu 18.04 LTS / 20.04 LTS / 20.10 : Linux kernel vulnerabilities (USN-4887-1)NessusUbuntu Local Security Checks
high