{ "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/oraclelinux6els/vex/2026/cve-2026-41991-els_os-oraclelinux6els.json" } ], "tracking": { "current_release_date": "2026-07-19T04:54:28Z", "generator": { "date": "2026-07-19T04:54:28Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-41991-ELS_OS-ORACLELINUX6ELS", "initial_release_date": "2026-06-29T12:16:00Z", "revision_history": [ { "date": "2026-06-29T12:16:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-07-02T12:36:35Z", "number": "2", "summary": "Official Publication" }, { "date": "2026-07-03T04:25:54Z", "number": "3", "summary": "Update document" }, { "date": "2026-07-19T04:54:28Z", "number": "4", "summary": "Update document" } ], "status": "final", "version": "4" }, "title": "Security update on CVE-2026-41991" }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version", "name": "gzip-0:1.3.12-24.el6.x86_64", "product": { "name": "gzip-0:1.3.12-24.el6.x86_64", "product_id": "gzip-0:1.3.12-24.el6.x86_64", "product_identification_helper": { "purl": "pkg:rpm/oracle/gzip@1.3.12-24.el6?arch=x86_64" } } } ], "category": "architecture", "name": "x86_64" }, { "branches": [ { "category": "product_name", "name": "Oracle Linux 6", "product": { "name": "Oracle Linux 6", "product_id": "Oracle-Linux-6", "product_identification_helper": { "cpe": "cpe:2.3:o:oracle:linux:6:*:*:*:*:*:*:*" } } } ], "category": "product_family", "name": "Oracle Linux" } ], "category": "vendor", "name": "Oracle Corporation" }, { "branches": [ { "branches": [ { "category": "product_version", "name": "gzip-0:1.3.12-24.el6.tuxcare.els1.x86_64", "product": { "name": "gzip-0:1.3.12-24.el6.tuxcare.els1.x86_64", "product_id": "gzip-0:1.3.12-24.el6.tuxcare.els1.x86_64", "product_identification_helper": { "purl": "pkg:rpm/cloudlinux/gzip@1.3.12-24.el6.tuxcare.els1?arch=x86_64" } } }, { "category": "product_version", "name": "gzip-0:1.3.12-24.el6.tuxcare.els2.x86_64", "product": { "name": "gzip-0:1.3.12-24.el6.tuxcare.els2.x86_64", "product_id": "gzip-0:1.3.12-24.el6.tuxcare.els2.x86_64", "product_identification_helper": { "purl": "pkg:rpm/cloudlinux/gzip@1.3.12-24.el6.tuxcare.els2?arch=x86_64" } } } ], "category": "architecture", "name": "x86_64" } ], "category": "vendor", "name": "CloudLinux" } ], "relationships": [ { "category": "default_component_of", "full_product_name": { "name": "gzip-0:1.3.12-24.el6.tuxcare.els1.x86_64 as a component of Oracle Linux 6", "product_id": "Oracle-Linux-6:gzip-0:1.3.12-24.el6.tuxcare.els1.x86_64" }, "product_reference": "gzip-0:1.3.12-24.el6.tuxcare.els1.x86_64", "relates_to_product_reference": "Oracle-Linux-6" }, { "category": "default_component_of", "full_product_name": { "name": "gzip-0:1.3.12-24.el6.x86_64 as a component of Oracle Linux 6", "product_id": "Oracle-Linux-6:gzip-0:1.3.12-24.el6.x86_64" }, "product_reference": "gzip-0:1.3.12-24.el6.x86_64", "relates_to_product_reference": "Oracle-Linux-6" }, { "category": "default_component_of", "full_product_name": { "name": "gzip-0:1.3.12-24.el6.tuxcare.els2.x86_64 as a component of Oracle Linux 6", "product_id": "Oracle-Linux-6:gzip-0:1.3.12-24.el6.tuxcare.els2.x86_64" }, "product_reference": "gzip-0:1.3.12-24.el6.tuxcare.els2.x86_64", "relates_to_product_reference": "Oracle-Linux-6" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-41991", "cwe": { "id": "CWE-377", "name": "Insecure Temporary File" }, "notes": [ { "category": "description", "text": "GNU gzip contains a vulnerability in the gzexe utility related to insecure temporary file handling. When the mktemp utility is not available in the user’s PATH, gzexe falls back to constructing a temporary file path based solely on the process ID (PID). This predictable filename is created without exclusive access or existence checks.\nA local attacker can pre‑create the predicted temporary file path as a symbolic link pointing to an arbitrary file writable by the victim. When gzexe runs, it follows the symlink and overwrites the target file, resulting in a time‑of‑check to time‑of‑use (TOCTOU) condition that allows arbitrary file overwrite.\n\nThis issue has been fixed in the commit 4e6f8b24ab823146ab8776f0b7fe486ab34d4269", "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": [ "Oracle-Linux-6:gzip-0:1.3.12-24.el6.tuxcare.els1.x86_64", "Oracle-Linux-6:gzip-0:1.3.12-24.el6.tuxcare.els2.x86_64", "Oracle-Linux-6:gzip-0:1.3.12-24.el6.x86_64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-41991" }, { "category": "external", "summary": "https://cert.pl/en/posts/2026/04/CVE-2026-41991/", "url": "https://cert.pl/en/posts/2026/04/CVE-2026-41991/" }, { "category": "external", "summary": "https://cgit.git.savannah.gnu.org/cgit/gzip.git/commit/?id=4e6f8b24ab823146ab8776f0b7fe486ab34d4269", "url": "https://cgit.git.savannah.gnu.org/cgit/gzip.git/commit/?id=4e6f8b24ab823146ab8776f0b7fe486ab34d4269" }, { "category": "external", "summary": "https://www.gnu.org/software/gzip/", "url": "https://www.gnu.org/software/gzip/" } ], "release_date": "2026-06-29T12:16:00Z", "remediations": [ { "category": "no_fix_planned", "date": "2026-07-03T00:59:03.977270Z", "details": "This flaw is confined to the gzexe helper script and only triggers when mktemp is absent from the caller’s PATH; if mktemp is available, the unsafe temporary-file path is bypassed. Exploitation is local-only, requires a pre-created symlink and timing a PID‑based race, and at most overwrites files already writable by the invoking user, with no confidentiality or availability impact or inherent privilege escalation. Because gzexe is an optional utility not invoked by gzip’s standard compression/decompression paths, this can be safely deprioritized for managed server and VM deployments.", "product_ids": [ "Oracle-Linux-6:gzip-0:1.3.12-24.el6.tuxcare.els1.x86_64", "Oracle-Linux-6:gzip-0:1.3.12-24.el6.tuxcare.els2.x86_64", "Oracle-Linux-6:gzip-0:1.3.12-24.el6.x86_64" ] } ], "scores": [ { "cvss_v3": { "attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N", "version": "3.1" }, "products": [ "Oracle-Linux-6:gzip-0:1.3.12-24.el6.tuxcare.els1.x86_64", "Oracle-Linux-6:gzip-0:1.3.12-24.el6.tuxcare.els2.x86_64", "Oracle-Linux-6:gzip-0:1.3.12-24.el6.x86_64" ] } ], "threats": [ { "category": "impact", "details": "Moderate" } ] } ] }