title: Linux kernel eBPF RINGBUF map oversized allocation
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).
problem types: CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
affected:
{
product: Linux kernel
vendor: Linux
versions:
lessThan: v5.13-rc4, status: affected, version: trunk, versionType: custom
lessThan: v5.12.4, status: affected, version: linux-5.12.y, versionType: custom
lessThan: v5.11.21, status: affected, version: linux-5.11.y, versionType: custom
lessThan: v5.10.37, status: affected, version: linux-5.10.y, versionType: custom
lessThan: 5.8*, status: affected, version: v5.8, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: HIGH
attackVector: LOCAL
availabilityImpact: HIGH
baseScore: 7.8
baseSeverity: HIGH
confidentialityImpact: HIGH
integrityImpact: HIGH
privilegesRequired: LOW
scope: CHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
version: 3.1
]