Linux kernel eBPF RINGBUF map oversized allocation
At a glance
Severity
HIGH 7.8
EPSS
EPSS 0.55 % · percentile 46 (2026-10-28)
State
PUBLISHED
Published
Updated
Assigner
canonical
NVD status
Modified
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).
