CVE-2022-49030 Information

Description

In the Linux kernel the following vulnerability has been resolved:

libbpf: Handle size overflow for ringbuf mmap

The maximum size of ringbuf is 2GB on x86-64 host so 2 max_entries will overflow u32 when mapping producer page and data pages. Only casting max_entries to size_t is not enough because for 32-bits application on 64-bits kernel the size of read-only mmap region also could overflow size_t.

So fixing it by casting the size of read-only mmap region into a __u64 and checking whether or not there will be overflow during mmap.

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Reference

https://git.kernel.org/stable/c/8a549ab6724520aa3c07f47e0eba820293551490 https://git.kernel.org/stable/c/0140e079a42064680394fff1199a7b5483688dec https://git.kernel.org/stable/c/535a25ab4f9a45f74ba38ab71de95e97474922ed https://git.kernel.org/stable/c/927cbb478adf917e0a142b94baa37f06279cc466

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.8