{ "document": { "aggregate_severity": { "text": "Important" }, "category": "csaf_security_advisory", "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" }, { "category": "details", "text": "CVE-2026-59679: validate num_chars against the encoding array size in\n fs_read_glyphs() in src/fc/fserve.c; prevents an out-of-bounds read/write on\n encoding[] when a font server sends more glyphs than extents\n (upstream commit 668fea81f40bcb48ec67fb55d0b851049d265290)\n- CVE-2026-44950: bounds-check cumulative glyph data writes in fs_read_glyphs()\n in src/fc/fserve.c; prevents a heap buffer overflow from overlapping source\n offsets whose total length exceeds the allocated bitmap buffer\n (upstream commit c2d222bb22c623d8a40f3275077fc7e6617f2c8a)", "title": "Details" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "https://cve.tuxcare.com/els/releases/CLSA-2026:1787162017", "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1787162017" }, { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/tuxcare9.6esu/advisories/2026/clsa-2026_1787162017.json" } ], "tracking": { "current_release_date": "2026-08-19T17:54:21Z", "generator": { "date": "2026-08-19T17:54:21Z", "engine": { "name": "pyCSAF" } }, "id": "CLSA-2026:1787162017", "initial_release_date": "2026-08-19T17:54:21Z", "revision_history": [ { "date": "2026-08-19T17:54:21Z", "number": "1", "summary": "Initial version" } ], "status": "final", "version": "1" }, "title": "libXfont2: Fix of 2 CVEs" }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "AlmaLinux 9.6", "product": { "name": "AlmaLinux 9.6", "product_id": "AlmaLinux-9.6", "product_identification_helper": { "cpe": "cpe:2.3:o:almalinux:almalinux:9.6:*:*:*:*:*:*:*" } } } ], "category": "product_family", "name": "AlmaLinux" } ], "category": "vendor", "name": "AlmaLinux OS Foundation" }, { "branches": [ { "branches": [ { "category": "product_name", "name": "Rocky Linux 9.6", "product": { "name": "Rocky Linux 9.6", "product_id": "Rocky Linux-9.6", "product_identification_helper": { "cpe": "cpe:2.3:o:resf:rocky_linux:9.6:*:*:*:*:*:*:*" } } } ], "category": "product_family", "name": "Rocky Linux" } ], "category": "vendor", "name": "Rocky Linux" }, { "branches": [ { "branches": [ { "category": "product_version", "name": "libXfont2-devel-0:2.0.3-12.el9_6.tuxcare.els4.i686", "product": { "name": "libXfont2-devel-0:2.0.3-12.el9_6.tuxcare.els4.i686", "product_id": "libXfont2-devel-0:2.0.3-12.el9_6.tuxcare.els4.i686", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/libXfont2-devel@2.0.3-12.el9_6.tuxcare.els4?arch=i686" } } }, { "category": "product_version", "name": "libXfont2-0:2.0.3-12.el9_6.tuxcare.els4.i686", "product": { "name": "libXfont2-0:2.0.3-12.el9_6.tuxcare.els4.i686", "product_id": "libXfont2-0:2.0.3-12.el9_6.tuxcare.els4.i686", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/libXfont2@2.0.3-12.el9_6.tuxcare.els4?arch=i686" } } }, { "category": "product_version", "name": "libXfont2-0:2.0.3-12.el9.tuxcare.els3.i686", "product": { "name": "libXfont2-0:2.0.3-12.el9.tuxcare.els3.i686", "product_id": "libXfont2-0:2.0.3-12.el9.tuxcare.els3.i686", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/libXfont2@2.0.3-12.el9.tuxcare.els3?arch=i686" } } }, { "category": "product_version", "name": "libXfont2-devel-0:2.0.3-12.el9.tuxcare.els3.i686", "product": { "name": "libXfont2-devel-0:2.0.3-12.el9.tuxcare.els3.i686", "product_id": "libXfont2-devel-0:2.0.3-12.el9.tuxcare.els3.i686", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/libXfont2-devel@2.0.3-12.el9.tuxcare.els3?arch=i686" } } } ], "category": "architecture", "name": "i686" }, { "branches": [ { "category": "product_version", "name": "libXfont2-devel-0:2.0.3-12.el9_6.tuxcare.els4.x86_64", "product": { "name": "libXfont2-devel-0:2.0.3-12.el9_6.tuxcare.els4.x86_64", "product_id": "libXfont2-devel-0:2.0.3-12.el9_6.tuxcare.els4.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/libXfont2-devel@2.0.3-12.el9_6.tuxcare.els4?arch=x86_64" } } }, { "category": "product_version", "name": "libXfont2-0:2.0.3-12.el9_6.tuxcare.els4.x86_64", "product": { "name": "libXfont2-0:2.0.3-12.el9_6.tuxcare.els4.x86_64", "product_id": "libXfont2-0:2.0.3-12.el9_6.tuxcare.els4.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/libXfont2@2.0.3-12.el9_6.tuxcare.els4?arch=x86_64" } } }, { "category": "product_version", "name": "libXfont2-0:2.0.3-12.el9.tuxcare.els3.x86_64", "product": { "name": "libXfont2-0:2.0.3-12.el9.tuxcare.els3.x86_64", "product_id": "libXfont2-0:2.0.3-12.el9.tuxcare.els3.x86_64", "product_identification_helper": { "purl": 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"libXfont2-0:2.0.3-12.el9.tuxcare.els3.i686 as a component of Rocky Linux 9.6", "product_id": "Rocky Linux-9.6:libXfont2-0:2.0.3-12.el9.tuxcare.els3.i686" }, "product_reference": "libXfont2-0:2.0.3-12.el9.tuxcare.els3.i686", "relates_to_product_reference": "Rocky Linux-9.6" }, { "category": "default_component_of", "full_product_name": { "name": "libXfont2-0:2.0.3-12.el9.tuxcare.els3.x86_64 as a component of Rocky Linux 9.6", "product_id": "Rocky Linux-9.6:libXfont2-0:2.0.3-12.el9.tuxcare.els3.x86_64" }, "product_reference": "libXfont2-0:2.0.3-12.el9.tuxcare.els3.x86_64", "relates_to_product_reference": "Rocky Linux-9.6" }, { "category": "default_component_of", "full_product_name": { "name": "libXfont2-devel-0:2.0.3-12.el9.tuxcare.els3.x86_64 as a component of Rocky Linux 9.6", "product_id": "Rocky Linux-9.6:libXfont2-devel-0:2.0.3-12.el9.tuxcare.els3.x86_64" }, "product_reference": "libXfont2-devel-0:2.0.3-12.el9.tuxcare.els3.x86_64", "relates_to_product_reference": "Rocky Linux-9.6" }, { "category": "default_component_of", "full_product_name": { "name": "libXfont2-devel-0:2.0.3-12.el9.tuxcare.els3.i686 as a component of Rocky Linux 9.6", "product_id": "Rocky Linux-9.6:libXfont2-devel-0:2.0.3-12.el9.tuxcare.els3.i686" }, "product_reference": "libXfont2-devel-0:2.0.3-12.el9.tuxcare.els3.i686", "relates_to_product_reference": "Rocky Linux-9.6" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-44950", "cwe": { "id": "CWE-120", "name": "Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')" }, "notes": [ { "category": "description", "text": "A flaw was found in the libXfont2 font-server client. This heap buffer overflow vulnerability allows a malicious font server to send specially crafted glyph data. The fs_read_glyphs() function fails to properly validate the total size of the incoming data, leading to an overwrite of memory beyond the intended buffer. If the X server runs as a privileged user, this could result in privilege escalation, allowing an attacker to gain higher access. If the X server runs as an unprivileged user, it could lead to a denial of service, causing the system to crash.", "title": "Vulnerability description" } ], "product_status": { "fixed": [ "AlmaLinux-9.6:libXfont2-0:2.0.3-12.el9_6.tuxcare.els4.i686", "AlmaLinux-9.6:libXfont2-0:2.0.3-12.el9_6.tuxcare.els4.x86_64", "AlmaLinux-9.6:libXfont2-devel-0:2.0.3-12.el9_6.tuxcare.els4.i686", "AlmaLinux-9.6:libXfont2-devel-0:2.0.3-12.el9_6.tuxcare.els4.x86_64", "Rocky Linux-9.6:libXfont2-0:2.0.3-12.el9_6.tuxcare.els4.i686", "Rocky Linux-9.6:libXfont2-0:2.0.3-12.el9_6.tuxcare.els4.x86_64", "Rocky Linux-9.6:libXfont2-devel-0:2.0.3-12.el9_6.tuxcare.els4.i686", "Rocky Linux-9.6:libXfont2-devel-0:2.0.3-12.el9_6.tuxcare.els4.x86_64" ], "known_affected": [ "AlmaLinux-9.6:libXfont2-0:2.0.3-12.el9.tuxcare.els3.i686", "AlmaLinux-9.6:libXfont2-0:2.0.3-12.el9.tuxcare.els3.x86_64", "AlmaLinux-9.6:libXfont2-devel-0:2.0.3-12.el9.tuxcare.els3.i686", "AlmaLinux-9.6:libXfont2-devel-0:2.0.3-12.el9.tuxcare.els3.x86_64", "Rocky Linux-9.6:libXfont2-0:2.0.3-12.el9.tuxcare.els3.i686", "Rocky Linux-9.6:libXfont2-0:2.0.3-12.el9.tuxcare.els3.x86_64", "Rocky Linux-9.6:libXfont2-devel-0:2.0.3-12.el9.tuxcare.els3.i686", "Rocky Linux-9.6:libXfont2-devel-0:2.0.3-12.el9.tuxcare.els3.x86_64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-44950" } ], "remediations": [ { "category": "vendor_fix", "date": "2026-08-19T17:53:39.849590Z", "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1787162017", "product_ids": [ "AlmaLinux-9.6:libXfont2-0:2.0.3-12.el9_6.tuxcare.els4.i686", "AlmaLinux-9.6:libXfont2-0:2.0.3-12.el9_6.tuxcare.els4.x86_64", "AlmaLinux-9.6:libXfont2-devel-0:2.0.3-12.el9_6.tuxcare.els4.i686", "AlmaLinux-9.6:libXfont2-devel-0:2.0.3-12.el9_6.tuxcare.els4.x86_64", "Rocky Linux-9.6:libXfont2-0:2.0.3-12.el9_6.tuxcare.els4.i686", "Rocky Linux-9.6:libXfont2-0:2.0.3-12.el9_6.tuxcare.els4.x86_64", "Rocky Linux-9.6:libXfont2-devel-0:2.0.3-12.el9_6.tuxcare.els4.i686", "Rocky Linux-9.6:libXfont2-devel-0:2.0.3-12.el9_6.tuxcare.els4.x86_64" ], "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1787162017" }, { "category": "none_available", "details": "Affected", "product_ids": [ "AlmaLinux-9.6:libXfont2-0:2.0.3-12.el9.tuxcare.els3.i686", "AlmaLinux-9.6:libXfont2-0:2.0.3-12.el9.tuxcare.els3.x86_64", "AlmaLinux-9.6:libXfont2-devel-0:2.0.3-12.el9.tuxcare.els3.i686", "AlmaLinux-9.6:libXfont2-devel-0:2.0.3-12.el9.tuxcare.els3.x86_64", "Rocky Linux-9.6:libXfont2-0:2.0.3-12.el9.tuxcare.els3.i686", "Rocky Linux-9.6:libXfont2-0:2.0.3-12.el9.tuxcare.els3.x86_64", "Rocky Linux-9.6:libXfont2-devel-0:2.0.3-12.el9.tuxcare.els3.i686", "Rocky Linux-9.6:libXfont2-devel-0:2.0.3-12.el9.tuxcare.els3.x86_64" ] } ], "threats": [ { "category": "impact", "details": "Important" } ] }, { "cve": "CVE-2026-59679", "cwe": { "id": "CWE-125", "name": "Out-of-bounds Read" }, "notes": [ { "category": "description", "text": "A flaw was found in the libXfont2 font-server client. A remote attacker, by operating a malicious font server, could exploit an out-of-bounds read/write vulnerability. This occurs because the client incorrectly handles font data, leading to an out-of-bounds memory access. This can lead to privilege escalation if the X server runs with root privileges, or a denial of service (crash) if it runs as an unprivileged user.", "title": "Vulnerability description" } ], "product_status": { "fixed": [ "AlmaLinux-9.6:libXfont2-0:2.0.3-12.el9_6.tuxcare.els4.i686", "AlmaLinux-9.6:libXfont2-0:2.0.3-12.el9_6.tuxcare.els4.x86_64", "AlmaLinux-9.6:libXfont2-devel-0:2.0.3-12.el9_6.tuxcare.els4.i686", "AlmaLinux-9.6:libXfont2-devel-0:2.0.3-12.el9_6.tuxcare.els4.x86_64", "Rocky Linux-9.6:libXfont2-0:2.0.3-12.el9_6.tuxcare.els4.i686", "Rocky Linux-9.6:libXfont2-0:2.0.3-12.el9_6.tuxcare.els4.x86_64", "Rocky Linux-9.6:libXfont2-devel-0:2.0.3-12.el9_6.tuxcare.els4.i686", "Rocky Linux-9.6:libXfont2-devel-0:2.0.3-12.el9_6.tuxcare.els4.x86_64" ], "known_affected": [ "AlmaLinux-9.6:libXfont2-0:2.0.3-12.el9.tuxcare.els3.i686", "AlmaLinux-9.6:libXfont2-0:2.0.3-12.el9.tuxcare.els3.x86_64", "AlmaLinux-9.6:libXfont2-devel-0:2.0.3-12.el9.tuxcare.els3.i686", "AlmaLinux-9.6:libXfont2-devel-0:2.0.3-12.el9.tuxcare.els3.x86_64", "Rocky Linux-9.6:libXfont2-0:2.0.3-12.el9.tuxcare.els3.i686", "Rocky Linux-9.6:libXfont2-0:2.0.3-12.el9.tuxcare.els3.x86_64", "Rocky Linux-9.6:libXfont2-devel-0:2.0.3-12.el9.tuxcare.els3.i686", "Rocky Linux-9.6:libXfont2-devel-0:2.0.3-12.el9.tuxcare.els3.x86_64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-59679" } ], "remediations": [ { "category": "vendor_fix", "date": "2026-08-19T17:53:39.849590Z", "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1787162017", "product_ids": [ "AlmaLinux-9.6:libXfont2-0:2.0.3-12.el9_6.tuxcare.els4.i686", "AlmaLinux-9.6:libXfont2-0:2.0.3-12.el9_6.tuxcare.els4.x86_64", "AlmaLinux-9.6:libXfont2-devel-0:2.0.3-12.el9_6.tuxcare.els4.i686", "AlmaLinux-9.6:libXfont2-devel-0:2.0.3-12.el9_6.tuxcare.els4.x86_64", "Rocky Linux-9.6:libXfont2-0:2.0.3-12.el9_6.tuxcare.els4.i686", "Rocky Linux-9.6:libXfont2-0:2.0.3-12.el9_6.tuxcare.els4.x86_64", "Rocky Linux-9.6:libXfont2-devel-0:2.0.3-12.el9_6.tuxcare.els4.i686", "Rocky Linux-9.6:libXfont2-devel-0:2.0.3-12.el9_6.tuxcare.els4.x86_64" ], "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1787162017" }, { "category": "none_available", "details": "Affected", "product_ids": [ "AlmaLinux-9.6:libXfont2-0:2.0.3-12.el9.tuxcare.els3.i686", "AlmaLinux-9.6:libXfont2-0:2.0.3-12.el9.tuxcare.els3.x86_64", "AlmaLinux-9.6:libXfont2-devel-0:2.0.3-12.el9.tuxcare.els3.i686", "AlmaLinux-9.6:libXfont2-devel-0:2.0.3-12.el9.tuxcare.els3.x86_64", "Rocky Linux-9.6:libXfont2-0:2.0.3-12.el9.tuxcare.els3.i686", "Rocky Linux-9.6:libXfont2-0:2.0.3-12.el9.tuxcare.els3.x86_64", "Rocky Linux-9.6:libXfont2-devel-0:2.0.3-12.el9.tuxcare.els3.i686", "Rocky Linux-9.6:libXfont2-devel-0:2.0.3-12.el9.tuxcare.els3.x86_64" ] } ], "threats": [ { "category": "impact", "details": "Important" } ] } ] }