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CVE-2021-3491

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CVE-2021-3491

Published: Jun 4, 2021

Modified: Sep 16, 2024

PUBLISHED

CVSS v3.1

7.8

HIGH

Description

The io_uring subsystem in the Linux kernel allowed the MAX_RW_COUNT limit to be bypassed in the PROVIDE_BUFFERS operation, which led to negative values being usedin mem_rw when reading /proc/<PID>/mem. This could be used to create a heap overflow leading to arbitrary code execution in the kernel. It was addressed via commit d1f82808877b ("io_uring: truncate lengths larger than MAX_RW_COUNT on provide buffers") (v5.13-rc1) and backported to the stable kernels in v5.12.4, v5.11.21, and v5.10.37. It was introduced in ddf0322db79c ("io_uring: add IORING_OP_PROVIDE_BUFFERS") (v5.7-rc1).

VendorProductVersions

Linux

Linux kernel

affected
trunk - < v5.13-rc4
affected
linux-5.12.y - < v5.12.4
affected
linux-5.11.y - < v5.11.21
affected
linux-5.10.y - < v5.10.37
affected
v5.7-rc1 - < 5.7*

Weaknesses (CWE)

CWE-131

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

References

https://ubuntu.com/security/notices/USN-4950-1
vendor-advisory
x_refsource_UBUNTU
https://ubuntu.com/security/notices/USN-4949-1
vendor-advisory
x_refsource_UBUNTU

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