CVE-2023-40550

Shim: out-of-bound read in verify_buffer_sbat()

State: Published
Severity: 5.5 Medium
Published: Jan 29, 2024
Updated: Jan 27, 2026
Reserved: Aug 15, 2023

Description

An out-of-bounds read flaw was found in Shim when it tried to validate the SBAT information. This issue may expose sensitive data during the system's boot phase.

Scores

CVSS	Score	Vector	Source
3.1	5.5 Medium	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N	redhat

Weaknesses

CWE-125 Out-of-bounds Read

Affected Products

Product	Versions
Red Hat Enterprise Linux 7Red Hat	0:15.8-3.el7 and laterNot affected
Red Hat Enterprise Linux 7Red Hat	0:15.8-1.el7 and laterNot affected
Red Hat Enterprise Linux 8Red Hat	0:15.8-4.el8_9 and laterNot affected
Red Hat Enterprise Linux 8.2 Advanced Update SupportRed Hat	0:15.8-2.el8_2 and laterNot affected
Red Hat Enterprise Linux 8.2 Telecommunications Update ServiceRed Hat	0:15.8-2.el8_2 and laterNot affected
Red Hat Enterprise Linux 8.2 Update Services for SAP SolutionsRed Hat	0:15.8-2.el8_2 and laterNot affected
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRed Hat	0:15.8-2.el8_4 and laterNot affected
Red Hat Enterprise Linux 8.4 Telecommunications Update ServiceRed Hat	0:15.8-2.el8_4 and laterNot affected
Red Hat Enterprise Linux 8.4 Update Services for SAP SolutionsRed Hat	0:15.8-2.el8_4 and laterNot affected
Red Hat Enterprise Linux 8.6 Extended Update SupportRed Hat	0:15.8-2.el8_6 and laterNot affected
Red Hat Enterprise Linux 8.8 Extended Update SupportRed Hat	0:15.8-2.el8 and laterNot affected
Red Hat Enterprise Linux 8.8 Extended Update SupportRed Hat	0:15.8-2.el8 and laterNot affected
Red Hat Enterprise Linux 9Red Hat	0:15.8-4.el9_3 and laterNot affected
Red Hat Enterprise Linux 9.0 Extended Update SupportRed Hat	0:15.8-3.el9 and laterNot affected
Red Hat Enterprise Linux 9.0 Extended Update SupportRed Hat	0:15.8-2.el9 and laterNot affected
Red Hat Enterprise Linux 9.0 Extended Update SupportRed Hat	0:15.8-2.el9 and laterNot affected
Red Hat Enterprise Linux 9.2 Extended Update SupportRed Hat	0:15.8-3.el9_2 and laterNot affected

References

RHSA-2024:1834vendor-advisory
RHSA-2024:1835vendor-advisory
RHSA-2024:1873vendor-advisory
RHSA-2024:1876vendor-advisory
RHSA-2024:1883vendor-advisory
RHSA-2024:1902vendor-advisory
RHSA-2024:1903vendor-advisory
RHSA-2024:1959vendor-advisory
RHSA-2024:2086vendor-advisory
https://access.redhat.com/security/cve/CVE-2023-40550vdb-entry
RHBZ#2259915issue-tracking
https://lists.debian.org/debian-lts-announce/2024/05/msg00009.html

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