CVE-2021-3489

CVSS v3.1 7.8 (High)

CVSS v2.0 7.2 (High)

EPSS 0.05 % (19^th)

Affected Products 2

Advisories 14

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).

Weaknesses

CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-787: Out-of-bounds Write

CVE Status: PUBLISHED
CNA: Canonical Ltd.
Published Date: 2021-06-04 02:15:07
(3 years ago)
Updated Date: 2021-09-14 14:30:32
(3 years ago)

Affected Products

Canonical

Ubuntu Linux

Linux

Linux Kernel

Configuration #1

	CPE23	From	Up To
Linux Kernel from 5.8 version and prior 5.10.37 version	cpe:2.3:o:linux:linux_kernel	>= 5.8	< 5.10.37
Linux Kernel from 5.11 version and prior 5.11.21 version	cpe:2.3:o:linux:linux_kernel	>= 5.11	< 5.11.21
Linux Kernel from 5.12 version and prior 5.12.4 version	cpe:2.3:o:linux:linux_kernel	>= 5.12	< 5.12.4
Linux Kernel 5.13	cpe:2.3:o:linux:linux_kernel:5.13:-
Linux Kernel 5.13 Rc1	cpe:2.3:o:linux:linux_kernel:5.13:rc1
Linux Kernel 5.13 Rc2	cpe:2.3:o:linux:linux_kernel:5.13:rc2
Linux Kernel 5.13 Rc3	cpe:2.3:o:linux:linux_kernel:5.13:rc3

Configuration #2

		CPE23	From	Up To
	Canonical Ubuntu Linux 20.04	cpe:2.3:o:canonical:ubuntu_linux:20.04:::*:lts
	Canonical Ubuntu Linux 20.10	cpe:2.3:o:canonical:ubuntu_linux:20.10
	Canonical Ubuntu Linux 21.04	cpe:2.3:o:canonical:ubuntu_linux:21.04