{ "document": { "aggregate_severity": { "text": "Medium" }, "category": "csaf_vex", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/rhel7els/vex/2023/cve-2023-40546-els_os-rhel7els.json" } ], "tracking": { "current_release_date": "2026-05-07T01:26:01Z", "generator": { "date": "2026-05-07T01:26:01Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2023-40546-ELS_OS-RHEL7ELS", "initial_release_date": "2023-01-01T00:00:00Z", "revision_history": [ { "date": "2023-01-01T00:00:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-04-20T09:24:32Z", "number": "2", "summary": "Official Publication" }, { "date": "2026-05-07T01:26:01Z", "number": "3", "summary": "Update document" } ], "status": "final", "version": "3" }, "title": "Security update on CVE-2023-40546" }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Red Hat Enterprise Linux 7", "product": { "name": "Red Hat Enterprise Linux 7", "product_id": "Red-Hat-7", "product_identification_helper": { "cpe": "cpe:2.3:o:redhat:enterprise_linux:7:*:*:*:*:*:*:*" } } } ], "category": "product_family", "name": "Red Hat Enterprise Linux" }, { "branches": [ { "category": "product_version", "name": "shim-x64-0:15.8-2.el7.x86_64", "product": { "name": "shim-x64-0:15.8-2.el7.x86_64", "product_id": "shim-x64-0:15.8-2.el7.x86_64", "product_identification_helper": { "purl": "pkg:rpm/redhat/shim-x64@15.8-2.el7?arch=x86_64" } } }, { "category": "product_version", "name": "mokutil-0:15.8-2.el7.x86_64", "product": { "name": "mokutil-0:15.8-2.el7.x86_64", "product_id": "mokutil-0:15.8-2.el7.x86_64", "product_identification_helper": { "purl": "pkg:rpm/redhat/mokutil@15.8-2.el7?arch=x86_64" } } }, { "category": "product_version", "name": "shim-ia32-0:15.8-2.el7.x86_64", "product": { "name": "shim-ia32-0:15.8-2.el7.x86_64", "product_id": "shim-ia32-0:15.8-2.el7.x86_64", "product_identification_helper": { "purl": "pkg:rpm/redhat/shim-ia32@15.8-2.el7?arch=x86_64" } } } ], "category": "architecture", "name": "x86_64" } ], "category": "vendor", "name": "Red Hat, Inc." }, { "branches": [ { "branches": [ { "category": "product_version", "name": "shim-x64-0:15.8-2.el7.tuxcare.els1.x86_64", "product": { "name": "shim-x64-0:15.8-2.el7.tuxcare.els1.x86_64", "product_id": "shim-x64-0:15.8-2.el7.tuxcare.els1.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/shim-x64@15.8-2.el7.tuxcare.els1?arch=x86_64" } } }, { "category": "product_version", "name": "mokutil-0:15.8-2.el7.tuxcare.els1.x86_64", "product": { "name": "mokutil-0:15.8-2.el7.tuxcare.els1.x86_64", "product_id": "mokutil-0:15.8-2.el7.tuxcare.els1.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/mokutil@15.8-2.el7.tuxcare.els1?arch=x86_64" } } }, { "category": "product_version", "name": "shim-ia32-0:15.8-2.el7.tuxcare.els1.x86_64", "product": { "name": "shim-ia32-0:15.8-2.el7.tuxcare.els1.x86_64", "product_id": "shim-ia32-0:15.8-2.el7.tuxcare.els1.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/shim-ia32@15.8-2.el7.tuxcare.els1?arch=x86_64" } } } ], "category": "architecture", "name": "x86_64" } ], "category": "vendor", "name": "TuxCare" } ], "relationships": [ { "category": "default_component_of", "full_product_name": { "name": "shim-x64-0:15.8-2.el7.tuxcare.els1.x86_64 as a component of Red Hat Enterprise Linux 7", "product_id": "Red-Hat-7:shim-x64-0:15.8-2.el7.tuxcare.els1.x86_64" }, "product_reference": "shim-x64-0:15.8-2.el7.tuxcare.els1.x86_64", "relates_to_product_reference": "Red-Hat-7" }, { "category": "default_component_of", "full_product_name": { "name": "mokutil-0:15.8-2.el7.tuxcare.els1.x86_64 as a component of Red Hat Enterprise Linux 7", "product_id": "Red-Hat-7:mokutil-0:15.8-2.el7.tuxcare.els1.x86_64" }, "product_reference": "mokutil-0:15.8-2.el7.tuxcare.els1.x86_64", "relates_to_product_reference": "Red-Hat-7" }, { "category": "default_component_of", "full_product_name": { "name": "shim-ia32-0:15.8-2.el7.tuxcare.els1.x86_64 as a component of Red Hat Enterprise Linux 7", "product_id": "Red-Hat-7:shim-ia32-0:15.8-2.el7.tuxcare.els1.x86_64" }, "product_reference": "shim-ia32-0:15.8-2.el7.tuxcare.els1.x86_64", "relates_to_product_reference": "Red-Hat-7" }, { "category": "default_component_of", "full_product_name": { "name": "shim-x64-0:15.8-2.el7.x86_64 as a component of Red Hat Enterprise Linux 7", "product_id": "Red-Hat-7:shim-x64-0:15.8-2.el7.x86_64" }, "product_reference": "shim-x64-0:15.8-2.el7.x86_64", "relates_to_product_reference": "Red-Hat-7" }, { "category": "default_component_of", "full_product_name": { "name": "mokutil-0:15.8-2.el7.x86_64 as a component of Red Hat Enterprise Linux 7", "product_id": "Red-Hat-7:mokutil-0:15.8-2.el7.x86_64" }, "product_reference": "mokutil-0:15.8-2.el7.x86_64", "relates_to_product_reference": "Red-Hat-7" }, { "category": "default_component_of", "full_product_name": { "name": "shim-ia32-0:15.8-2.el7.x86_64 as a component of Red Hat Enterprise Linux 7", "product_id": "Red-Hat-7:shim-ia32-0:15.8-2.el7.x86_64" }, "product_reference": "shim-ia32-0:15.8-2.el7.x86_64", "relates_to_product_reference": "Red-Hat-7" } ] }, "vulnerabilities": [ { "cve": "CVE-2023-40546", "cwe": { "id": "CWE-476", "name": "NULL Pointer Dereference" }, "notes": [ { "category": "description", "text": "A flaw was found in Shim when an error happened while creating a new ESL variable. If Shim fails to create the new variable, it tries to print an error message to the user; however, the number of parameters used by the logging function doesn't match the format string used by it, leading to a crash under certain circumstances.", "title": "Vulnerability description" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "known_affected": [ "Red-Hat-7:mokutil-0:15.8-2.el7.tuxcare.els1.x86_64", "Red-Hat-7:mokutil-0:15.8-2.el7.x86_64", "Red-Hat-7:shim-ia32-0:15.8-2.el7.tuxcare.els1.x86_64", "Red-Hat-7:shim-ia32-0:15.8-2.el7.x86_64", "Red-Hat-7:shim-x64-0:15.8-2.el7.tuxcare.els1.x86_64", "Red-Hat-7:shim-x64-0:15.8-2.el7.x86_64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2023-40546" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2024:1834", "url": "https://access.redhat.com/errata/RHSA-2024:1834" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2024:1835", "url": "https://access.redhat.com/errata/RHSA-2024:1835" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2024:1873", "url": "https://access.redhat.com/errata/RHSA-2024:1873" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2024:1876", "url": "https://access.redhat.com/errata/RHSA-2024:1876" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2024:1883", "url": "https://access.redhat.com/errata/RHSA-2024:1883" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2024:1902", "url": "https://access.redhat.com/errata/RHSA-2024:1902" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2024:1903", "url": "https://access.redhat.com/errata/RHSA-2024:1903" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2024:1959", "url": "https://access.redhat.com/errata/RHSA-2024:1959" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2024:2086", "url": "https://access.redhat.com/errata/RHSA-2024:2086" }, { "category": "external", "summary": "https://access.redhat.com/security/cve/CVE-2023-40546", "url": "https://access.redhat.com/security/cve/CVE-2023-40546" }, { "category": "external", "summary": "https://bugzilla.redhat.com/show_bug.cgi?id=2241796", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2241796" }, { "category": "external", "summary": "https://lists.debian.org/debian-lts-announce/2024/05/msg00009.html", "url": "https://lists.debian.org/debian-lts-announce/2024/05/msg00009.html" } ], "release_date": "2024-01-29T17:15:00Z", "remediations": [ { "category": "no_fix_planned", "details": "This issue is confined to Shim’s pre‑boot error path and results only in a crash when creation of an EFI Signature List (ESL) variable fails; there is no confidentiality or integrity impact. Triggering it typically requires the ability to manipulate UEFI variables or exhaust NVRAM to force that failure, which entails local, privileged or console access rather than remote exploitation. Given the local‑only nature, availability‑only impact, and the narrow conditions needed to reach the buggy logging call, it is reasonable to deprioritize in managed server and VM environments.", "product_ids": [ "Red-Hat-7:mokutil-0:15.8-2.el7.tuxcare.els1.x86_64", "Red-Hat-7:mokutil-0:15.8-2.el7.x86_64", "Red-Hat-7:shim-ia32-0:15.8-2.el7.tuxcare.els1.x86_64", "Red-Hat-7:shim-ia32-0:15.8-2.el7.x86_64", "Red-Hat-7:shim-x64-0:15.8-2.el7.tuxcare.els1.x86_64", "Red-Hat-7:shim-x64-0:15.8-2.el7.x86_64" ] } ], "scores": [ { "cvss_v3": { "attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1" }, "products": [ "Red-Hat-7:mokutil-0:15.8-2.el7.tuxcare.els1.x86_64", "Red-Hat-7:mokutil-0:15.8-2.el7.x86_64", "Red-Hat-7:shim-ia32-0:15.8-2.el7.tuxcare.els1.x86_64", "Red-Hat-7:shim-ia32-0:15.8-2.el7.x86_64", "Red-Hat-7:shim-x64-0:15.8-2.el7.tuxcare.els1.x86_64", "Red-Hat-7:shim-x64-0:15.8-2.el7.x86_64" ] } ], "threats": [ { "category": "impact", "details": "Moderate" } ] } ] }