CVE-2023-40550

CVE.org · Published

Record status: Published
Identifier year (not publication year): 2023
Source publication: Jan 29, 2024
Source updated: Jan 27, 2026
Imported by cveboard: Oct 24, 2026
Source snapshot: cve_2026-10-24_midnight_baseline · Oct 24, 2026

CNA source text (English)

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

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.

Scoped product and version facts

Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.

Exploitation unknown; this catalogue does not assess exploitation.

Red Hat Enterprise Linux 7

Vendor: Red Hat
Product: Red Hat Enterprise Linux 7
Platforms: Unknown
Default status: affected
Package: shim
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 7 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:15.8-3.el7	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 7

Vendor: Red Hat
Product: Red Hat Enterprise Linux 7
Platforms: Unknown
Default status: affected
Package: shim-signed
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 7 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:15.8-1.el7	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8
Platforms: Unknown
Default status: affected
Package: shim
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:15.8-4.el8_9	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8.2 Advanced Update Support

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8.2 Advanced Update Support
Platforms: Unknown
Default status: affected
Package: shim
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8.2 Advanced Update Support · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:15.8-2.el8_2	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8.2 Telecommunications Update Service

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8.2 Telecommunications Update Service
Platforms: Unknown
Default status: affected
Package: shim
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8.2 Telecommunications Update Service · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:15.8-2.el8_2	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions
Platforms: Unknown
Default status: affected
Package: shim
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:15.8-2.el8_2	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
Platforms: Unknown
Default status: affected
Package: shim
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:15.8-2.el8_4	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8.4 Telecommunications Update Service

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8.4 Telecommunications Update Service
Platforms: Unknown
Default status: affected
Package: shim
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8.4 Telecommunications Update Service · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:15.8-2.el8_4	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions
Platforms: Unknown
Default status: affected
Package: shim
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:15.8-2.el8_4	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8.6 Extended Update Support

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8.6 Extended Update Support
Platforms: Unknown
Default status: affected
Package: shim
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8.6 Extended Update Support · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:15.8-2.el8_6	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8.8 Extended Update Support

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8.8 Extended Update Support
Platforms: Unknown
Default status: affected
Package: shim
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8.8 Extended Update Support · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:15.8-2.el8	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 8.8 Extended Update Support

Vendor: Red Hat
Product: Red Hat Enterprise Linux 8.8 Extended Update Support
Platforms: Unknown
Default status: affected
Package: shim-unsigned-x64
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 8.8 Extended Update Support · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:15.8-2.el8	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 9

Vendor: Red Hat
Product: Red Hat Enterprise Linux 9
Platforms: Unknown
Default status: affected
Package: shim
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 9 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:15.8-4.el9_3	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 9.0 Extended Update Support

Vendor: Red Hat
Product: Red Hat Enterprise Linux 9.0 Extended Update Support
Platforms: Unknown
Default status: affected
Package: shim
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 9.0 Extended Update Support · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:15.8-3.el9	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 9.0 Extended Update Support

Vendor: Red Hat
Product: Red Hat Enterprise Linux 9.0 Extended Update Support
Platforms: Unknown
Default status: affected
Package: shim-unsigned-aarch64
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 9.0 Extended Update Support · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:15.8-2.el9	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 9.0 Extended Update Support

Vendor: Red Hat
Product: Red Hat Enterprise Linux 9.0 Extended Update Support
Platforms: Unknown
Default status: affected
Package: shim-unsigned-x64
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 9.0 Extended Update Support · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:15.8-2.el9	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 9.2 Extended Update Support

Vendor: Red Hat
Product: Red Hat Enterprise Linux 9.2 Extended Update Support
Platforms: Unknown
Default status: affected
Package: shim
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 9.2 Extended Update Support · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
0:15.8-3.el9_2	`unaffected`	rpm	*	Unavailable	None listed