Shim: out-of-bound read in verify_buffer_sbat() (Red Hat Red Hat Enterprise Linux 7)

CVE-2023-40550

MEDIUM 5.5

At a glance

Source: NVD
EPSS: EPSS 0.40 % · percentile 34 (2026-10-29)
State: PUBLISHED
Published: 2024-01-29 16:29 UTC
Updated: 2026-01-27 10:55 UTC
Assigner: redhat
NVD status: Modified

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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.

Weaknesses (CWE)

CWE-125 — Out-of-bounds Read

References

Scores

Version	Score	Vector	Scored by
CVSS 3.1	MEDIUM 5.5	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N	redhat
CVSS 3.1	MEDIUM 5.5	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N	NVD · secalert@redhat.com (Secondary)
CVSS 3.1	MEDIUM 5.5	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N	NVD · nvd@nist.gov (Primary)

European references

ENISA EUVD · EUVD-2023-45121
GCVE · GCVE-0-2023-40550

CERT-FR advisories

CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
CERTFR-2024-AVI-0506 — Multiples vulnérabilités dans Juniper Secure Analytics · cert.ssi.gouv.fr
CERTFR-2024-AVI-0470 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

cpe:2.3:a:redhat:shim:*:*:*:*:*:*:*:* < 15.8
cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*

Affected products

Product	Versions
Red Hat · Red Hat Enterprise Linux 7	unaffected 0:15.8-3.el7 < *
Red Hat · Red Hat Enterprise Linux 7	unaffected 0:15.8-1.el7 < *
Red Hat · Red Hat Enterprise Linux 8	unaffected 0:15.8-4.el8_9 < *
Red Hat · Red Hat Enterprise Linux 8.2 Advanced Update Support	unaffected 0:15.8-2.el8_2 < *
Red Hat · Red Hat Enterprise Linux 8.2 Telecommunications Update Service	unaffected 0:15.8-2.el8_2 < *
Red Hat · Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions	unaffected 0:15.8-2.el8_2 < *
Red Hat · Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support	unaffected 0:15.8-2.el8_4 < *
Red Hat · Red Hat Enterprise Linux 8.4 Telecommunications Update Service	unaffected 0:15.8-2.el8_4 < *
Red Hat · Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions	unaffected 0:15.8-2.el8_4 < *
Red Hat · Red Hat Enterprise Linux 8.6 Extended Update Support	unaffected 0:15.8-2.el8_6 < *
Red Hat · Red Hat Enterprise Linux 8.8 Extended Update Support	unaffected 0:15.8-2.el8 < *
Red Hat · Red Hat Enterprise Linux 8.8 Extended Update Support	unaffected 0:15.8-2.el8 < *
Red Hat · Red Hat Enterprise Linux 9	unaffected 0:15.8-4.el9_3 < *
Red Hat · Red Hat Enterprise Linux 9.0 Extended Update Support	unaffected 0:15.8-3.el9 < *
Red Hat · Red Hat Enterprise Linux 9.0 Extended Update Support	unaffected 0:15.8-2.el9 < *
Red Hat · Red Hat Enterprise Linux 9.0 Extended Update Support	unaffected 0:15.8-2.el9 < *
Red Hat · Red Hat Enterprise Linux 9.2 Extended Update Support	unaffected 0:15.8-3.el9_2 < *

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD