CVE-2023-40548

HighCVSS 7.4/10Last modified Jun 26, 2026

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.

Metrics

CVSS 3.1 7.4/10CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-190CWE-787

Affected software

VendorProductVersions
Red HatRed Hat Enterprise Linux 7—
Red HatRed Hat Enterprise Linux 7—
Red HatRed Hat Enterprise Linux 8—
Red HatRed Hat Enterprise Linux 8.2 Advanced Update Support—
Red HatRed Hat Enterprise Linux 8.2 Telecommunications Update Service—
Red HatRed Hat Enterprise Linux 8.2 Update Services for SAP Solutions—
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support—
Red HatRed Hat Enterprise Linux 8.4 Telecommunications Update Service—
Red HatRed Hat Enterprise Linux 8.4 Update Services for SAP Solutions—
Red HatRed Hat Enterprise Linux 8.6 Extended Update Support—
Red HatRed Hat Enterprise Linux 8.8 Extended Update Support—
Red HatRed Hat Enterprise Linux 8.8 Extended Update Support—
Red HatRed Hat Enterprise Linux 9—
Red HatRed Hat Enterprise Linux 9.0 Extended Update Support—
Red HatRed Hat Enterprise Linux 9.0 Extended Update Support—
Red HatRed Hat Enterprise Linux 9.0 Extended Update Support—
Red HatRed Hat Enterprise Linux 9.2 Extended Update Support—

References

Timeline

Published
Jan 29, 2024
Last modified
Jun 26, 2026
NVD status
Modified

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CVE-2023-40548: High severity, CVSS 7.4 | Vulnix