CVE-2021-3489

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 eBPF RINGBUF bpf_ringbuf_reserve() function in the Linux kernel did not check that the allocated size was smaller than the ringbuf size, allowing an attacker to perform out-of-bounds writes within the kernel and therefore, arbitrary code execution. This issue was fixed via commit 4b81ccebaeee ("bpf, ringbuf: Deny reserve of buffers larger than ringbuf") (v5.13-rc4) and backported to the stable kernels in v5.12.4, v5.11.21, and v5.10.37. It was introduced via 457f44363a88 ("bpf: Implement BPF ring buffer and verifier support for it") (v5.8-rc1).

References

https://www.zerodayinitiative.com/advisories/ZDI-21-590/

https://ubuntu.com/security/notices/USN-4949-1

https://ubuntu.com/security/notices/USN-4950-1

https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=4b81ccebaeee885ab1aa1438133f2991e3a2b6ea

https://www.openwall.com/lists/oss-security/2021/05/11/10

https://security.netapp.com/advisory/ntap-20210716-0004/

Details

Source: MITRE

Published: 2021-06-04

Updated: 2021-09-14

Type: CWE-787

Risk Information

CVSS v2

Base Score: 7.2

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

Impact Score: 10

Exploitability Score: 3.9

Severity: HIGH

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 (14 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
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
151206SUSE SLES15 Security Update : kernel (Live Patch 0 for SLE 15 SP3) (SUSE-SU-2021:2198-1)NessusSuSE 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
149437Photon OS 4.0: Linux PHSA-2021-4.0-0023NessusPhotonOS Local Security Checks
high
149411Ubuntu 20.04 LTS / 20.10 : Linux kernel vulnerabilities (USN-4949-1)NessusUbuntu Local Security Checks
high
149407Ubuntu 20.04 LTS : Linux kernel (OEM) vulnerabilities (USN-4948-1)NessusUbuntu Local Security Checks
high
149406Ubuntu 21.04 : Linux kernel vulnerabilities (USN-4950-1)NessusUbuntu Local Security Checks
high