CVE-2021-29155
MEDIUMLinux Kernel < 5.11.16 - Out-of-Bounds Read via BPF Verifier Pointer Arithmetic
Title source: llmExploitation Summary
EIP tracks 2 public exploits for CVE-2021-29155. PoCs published by benschlueter.
AI-analyzed exploit summary This repository contains a functional proof-of-concept exploit for CVE-2021-29155, which leverages insufficient range tracking in the BPF verifier to perform out-of-bounds memory reads in the Linux kernel. The exploit demonstrates a Spectre-like side-channel attack to extract kernel data.
Description
An issue was discovered in the Linux kernel through 5.11.x. kernel/bpf/verifier.c performs undesirable out-of-bounds speculation on pointer arithmetic, leading to side-channel attacks that defeat Spectre mitigations and obtain sensitive information from kernel memory. Specifically, for sequences of pointer arithmetic operations, the pointer modification performed by the first operation is not correctly accounted for when restricting subsequent operations.
Exploits (2)
This repository contains a functional proof-of-concept exploit for CVE-2021-29155, which leverages insufficient range tracking in the BPF verifier to perform out-of-bounds memory reads in the Linux kernel. The exploit demonstrates a Spectre-like side-channel attack to extract kernel data.
This repository contains a functional proof-of-concept exploit for CVE-2021-29155, which leverages insufficient range tracking in the BPF verifier to perform out-of-bounds memory reads via speculative execution. The exploit demonstrates a Spectre-like side-channel attack to leak kernel data.
References (14)
Scores
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N