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CVE-2022-36449

Status Candidate

Overview

An issue was discovered in the Arm Mali GPU Kernel Driver. A non-privileged user can make improper GPU processing operations to gain access to already freed memory, write a limited amount outside of buffer bounds, or to disclose details of memory mappings. This affects Midgard r4p0 through r32p0, Bifrost r0p0 through r38p0 and r39p0 before r38p1, and Valhall r19p0 through r38p0 and r39p0 before r38p1.

Related Files

Arm Mali CSF Missing Buffer Size Check
Posted Sep 20, 2022
Authored by Jann Horn, Google Security Research

In the Linux Mali driver, when building with MALI_USE_CSF, the VFS read handler of the main Mali file descriptor (kbase_read()) never looks at its "count" parameter. This means that a simple userspace program that sets up a Mali file descriptor, then calls read(mali_fd, buf, 1), will see read() returning a higher length than requested, and out-of-bounds data in the userspace buffer will be clobbered.

tags | exploit
systems | linux
advisories | CVE-2022-36449
SHA-256 | 3d801b6f86d2cf6dcafab0fab084495a709669823b168ea8d4eaa15c04e2a64c
Arm Mali Race Condition
Posted Sep 20, 2022
Authored by Jann Horn, Google Security Research

The Mali driver frees GPU page tables before removing the higher-level PTEs pointing to those page tables (and, therefore, also before issuing the required flushes). This means a racing memory write instruction on the GPU can write to an attacker-controlled physical address.

tags | exploit
advisories | CVE-2022-36449
SHA-256 | b9314770c55b858e1768dc0c89581aba6dcd511b77abe5a7a6849771f7835386
Arm Mali Physical Address Exposure
Posted Sep 20, 2022
Authored by Jann Horn, Google Security Research

Arm Mali has an issue where a driver exposes physical addresses to unprivileged userspace.

tags | exploit
advisories | CVE-2022-36449
SHA-256 | 0dd6b9f2ab5a6a54b712bd8da62800520f10d77e1129a4be99b021e528de767a
Arm Mali Released Buffer Use-After-Free
Posted Sep 20, 2022
Authored by Jann Horn, Google Security Research

On Mali devices without the new CSF interface, IMPORTED_USER_BUF is released without flushing host-side VMAs, leading to a page use-after-free vulnerability.

tags | exploit
advisories | CVE-2022-36449
SHA-256 | 51a2923bc823fc6d20b96117084be18b4a15d5a3f49b9f2dc2e04e3c069198a0
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