{ "document": { "aggregate_severity": { "text": "High" }, "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/centos-stream8els/vex/2026/cve-2026-28386-els_os-centos-stream8els.json" } ], "tracking": { "current_release_date": "2026-10-20T14:53:40Z", "generator": { "date": "2026-10-20T14:53:40Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-28386-ELS_OS-CENTOS-STREAM8ELS", "initial_release_date": "2026-04-07T22:16:00Z", "revision_history": [ { "date": "2026-04-07T22:16:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-10-19T20:51:13Z", "number": "2", "summary": "Official Publication" }, { "date": "2026-10-20T14:53:40Z", "number": "3", "summary": "Update document" } ], "status": "final", "version": "3" }, "title": "Security update on CVE-2026-28386" }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Community Enterprise Operating System 8", "product": { "name": "Community Enterprise Operating System 8", "product_id": "CentOS-Stream-8", "product_identification_helper": { "cpe": "cpe:2.3:o:centos:centos:8:*:*:*:*:*:*:*" } } } ], "category": "product_family", "name": "Community Enterprise Operating System" } ], "category": "vendor", "name": "Red Hat, Inc." }, { "branches": [ { "branches": [ { "category": "product_version", "name": "shim-ia32-0:15.8-1.el8_2.tuxcare.els1.x86_64", "product": { "name": "shim-ia32-0:15.8-1.el8_2.tuxcare.els1.x86_64", "product_id": "shim-ia32-0:15.8-1.el8_2.tuxcare.els1.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/shim-ia32@15.8-1.el8_2.tuxcare.els1?arch=x86_64" } } }, { "category": "product_version", "name": "shim-x64-0:15.8-1.el8_2.tuxcare.els1.x86_64", "product": { "name": "shim-x64-0:15.8-1.el8_2.tuxcare.els1.x86_64", "product_id": "shim-x64-0:15.8-1.el8_2.tuxcare.els1.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/shim-x64@15.8-1.el8_2.tuxcare.els1?arch=x86_64" } } } ], "category": "architecture", "name": "x86_64" } ], "category": "vendor", "name": "TuxCare" } ], "relationships": [ { "category": "default_component_of", "full_product_name": { "name": "shim-ia32-0:15.8-1.el8_2.tuxcare.els1.x86_64 as a component of Community Enterprise Operating System 8", "product_id": "CentOS-Stream-8:shim-ia32-0:15.8-1.el8_2.tuxcare.els1.x86_64" }, "product_reference": "shim-ia32-0:15.8-1.el8_2.tuxcare.els1.x86_64", "relates_to_product_reference": "CentOS-Stream-8" }, { "category": "default_component_of", "full_product_name": { "name": "shim-x64-0:15.8-1.el8_2.tuxcare.els1.x86_64 as a component of Community Enterprise Operating System 8", "product_id": "CentOS-Stream-8:shim-x64-0:15.8-1.el8_2.tuxcare.els1.x86_64" }, "product_reference": "shim-x64-0:15.8-1.el8_2.tuxcare.els1.x86_64", "relates_to_product_reference": "CentOS-Stream-8" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-28386", "cwe": { "id": "CWE-125", "name": "Out-of-bounds Read" }, "notes": [ { "category": "description", "text": "Issue summary: Applications using AES-CFB128 encryption or decryption on\nsystems with AVX-512 and VAES support can trigger an out-of-bounds read\nof up to 15 bytes when processing partial cipher blocks.\n\nImpact summary: This out-of-bounds read may trigger a crash which leads to\nDenial of Service for an application if the input buffer ends at a memory\npage boundary and the following page is unmapped. There is no information\ndisclosure as the over-read bytes are not written to output.\n\nThe vulnerable code path is only reached when processing partial blocks\n(when a previous call left an incomplete block and the current call provides\nfewer bytes than needed to complete it). Additionally, the input buffer\nmust be positioned at a page boundary with the following page unmapped.\nCFB mode is not used in TLS/DTLS protocols, which use CBC, GCM, CCM, or\nChaCha20-Poly1305 instead. For these reasons the issue was assessed as\nLow severity according to our Security Policy.\n\nOnly x86-64 systems with AVX-512 and VAES instruction support are affected.\nOther architectures and systems without VAES support use different code\npaths that are not affected.\n\nOpenSSL FIPS module in 3.6 version is affected by this issue.", "title": "Vulnerability description" }, { "category": "other", "text": "TuxCare has assessed that this vulnerability does not impact any currently supported TuxCare products. This evaluation may change as new information becomes available. For additional details regarding this vulnerability and affected products, refer to the provided references.", "title": "Statement" } ], "product_status": { "known_not_affected": [ "CentOS-Stream-8:shim-ia32-0:15.8-1.el8_2.tuxcare.els1.x86_64", "CentOS-Stream-8:shim-x64-0:15.8-1.el8_2.tuxcare.els1.x86_64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-28386" }, { "category": "external", "summary": "https://github.com/openssl/openssl/commit/61f428a2fc6671ede184a19f71e6e495f0689621", "url": "https://github.com/openssl/openssl/commit/61f428a2fc6671ede184a19f71e6e495f0689621" }, { "category": "external", "summary": "https://openssl-library.org/news/secadv/20260407.txt", "url": "https://openssl-library.org/news/secadv/20260407.txt" } ], "release_date": "2026-04-07T22:16:00Z", "threats": [ { "category": "impact", "details": "Important" }, { "category": "impact", "date": "2026-10-20T14:14:29.988621Z", "details": "important", "product_ids": [ "CentOS-Stream-8:shim-ia32-0:15.8-1.el8_2.tuxcare.els1.x86_64", "CentOS-Stream-8:shim-x64-0:15.8-1.el8_2.tuxcare.els1.x86_64" ] } ] } ] }