Shim: interger overflow leads to heap buffer overflow in verify_sbat_section on 32-bits systems

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2023-40548
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-01-29 15:15:08 UTC
Updated2026-06-26 10:16:22 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.1 7.4 HIGH from [email protected]

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

EPSS: 0.004320000 probability, percentile 0.345680000 (date 2026-06-29)

Problem Types: CWE-190 | CWE-787 | CWE-190 Integer Overflow or Wraparound

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.4HIGHCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1[email protected]Secondary7.4HIGHCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNACVSS7.4HIGHCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Fedoraproject Fedora 39 All All All
Application Redhat Shim All All All All
Application Redhat Shim 15.8 rc1 All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Red Hat Red Hat Enterprise Linux 7 unaffected 0:15.8-3.el7 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 7 unaffected 0:15.8-1.el7 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8 unaffected 0:15.8-4.el8_9 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support unaffected 0:15.8-2.el8_2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.2 Telecommunications Update Service unaffected 0:15.8-2.el8_2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.2 Update Services For SAP Solutions unaffected 0:15.8-2.el8_2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support unaffected 0:15.8-2.el8_4 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.4 Telecommunications Update Service unaffected 0:15.8-2.el8_4 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.4 Update Services For SAP Solutions unaffected 0:15.8-2.el8_4 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support unaffected 0:15.8-2.el8_6 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support unaffected 0:15.8-2.el8 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support unaffected 0:15.8-2.el8 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9 unaffected 0:15.8-4.el9_3 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support unaffected 0:15.8-3.el9 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support unaffected 0:15.8-2.el9 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support unaffected 0:15.8-2.el9 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support unaffected 0:15.8-3.el9_2 * rpm Not specified

References

ReferenceSourceLinkTags
lists.debian.org/debian-lts-announce/2024/05/msg00009.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
access.redhat.com/errata/RHSA-2024:1883 af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
2241782 – (CVE-2023-40548) CVE-2023-40548 shim: Interger overflow leads to heap buffer overflow in verify_sbat_section on 32-bits systems af854a3a-2127-422b-91ae-364da2661108 bugzilla.redhat.com Issue Tracking, Vendor Advisory
access.redhat.com/errata/RHSA-2024:1902 af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
access.redhat.com/errata/RHSA-2024:1873 af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
cve-details af854a3a-2127-422b-91ae-364da2661108 access.redhat.com Vendor Advisory
access.redhat.com/errata/RHSA-2024:1834 af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
access.redhat.com/errata/RHSA-2024:2086 af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
access.redhat.com/errata/RHSA-2024:1835 af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
access.redhat.com/errata/RHSA-2024:1903 af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
access.redhat.com/errata/RHSA-2024:1876 af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
access.redhat.com/errata/RHSA-2024:1959 af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
CNA2023-10-02T00:00:00.000ZReported to Red Hat.
CNA2023-10-03T00:00:00.000ZMade public.

Workarounds

CNA: There's no available mitigation for this issue.

Legacy QID Mappings

  • 379359 Shim package Multiple Vulnerabilities
  • 673479 EulerOS Security Update for shim (EulerOS-SA-2024-1249)
  • 673695 EulerOS Security Update for shim (EulerOS-SA-2024-1227)
© CVE.report 2026 |

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

Free CVE JSON API cve.report/api

CVE.report and Source URL Uptime Status status.cve.report