CVE-2023-40548

CVE Details

Release Date:	2023-10-03
Impact:	Moderate	What is this?

Description

A buffer overflow was found in Shim in the 32-bit system. The overflow happens due to an addition operation involving a user-controlled value parsed from the PE binary being used by Shim. This value is further used for memory allocation operations, leading to a heap-based buffer overflow. This flaw causes memory corruption and can lead to a crash or data integrity issues during the boot phase.

See more information about CVE-2023-40548 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	6.2
Vector String:	CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
Version:	3.0
Attack Vector:	Local
Attack Complexity:	High
Privileges Required:	None
User Interaction:	None
Scope:	Unchanged
Confidentiality Impact:	Low
Integrity Impact:	Low
Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 7 (shim)	ELSA-2024-1959	2024-05-01
Oracle Linux version 7 (shim-signed)	ELSA-2024-1959	2024-05-01
Oracle Linux version 8 (shim)	ELSA-2024-1902	2024-04-25
Oracle Linux version 9 (shim)	ELSA-2024-1903	2024-04-22