CVE-2021-3489

HIGH

Linux Kernel 5.8-5.10.37 - Out-of-Bounds Write via eBPF RINGBUF bpf_ringbuf_reserve

Title source: llm
STIX 2.1

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 (6)

Core 6
Core References
Mailing List, Third Party Advisory mailing-list x_refsource_mlist
https://www.openwall.com/lists/oss-security/2021/05/11/10
Third Party Advisory, VDB Entry x_refsource_misc
https://www.zerodayinitiative.com/advisories/ZDI-21-590/
Third Party Advisory vendor-advisory x_refsource_ubuntu
https://ubuntu.com/security/notices/USN-4950-1
Third Party Advisory vendor-advisory x_refsource_ubuntu
https://ubuntu.com/security/notices/USN-4949-1
Third Party Advisory x_refsource_confirm
https://security.netapp.com/advisory/ntap-20210716-0004/

Scores

CVSS v3 7.8
EPSS 0.0008
EPSS Percentile 22.8%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Details

CWE
CWE-119 CWE-787
Status published
Products (5)
canonical/ubuntu_linux 20.04
canonical/ubuntu_linux 20.10
canonical/ubuntu_linux 21.04
linux/linux_kernel 5.13 (4 CPE variants)
linux/linux_kernel 5.8 - 5.10.37
Published Jun 04, 2021
Tracked Since Feb 18, 2026