{ "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": "* SECURITY UPDATE: local privilege escalation via the cifs.upcall\n getpwuid() lookup in the caller-controlled namespace\n - debian/patches/CVE-2026-12505.patch: in cifs.upcall.c, drop\n supplementary groups before decoding the spnego key, call getpwuid()\n while still on the host namespace instead of after\n switch_to_process_ns(), and translate the host UID/GID to the target\n user namespace by parsing /proc//{uid,gid}_map numerically.\n - CVE-2026-12505", "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-2026:1791334395", "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1791334395" }, { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/debian11els/advisories/2026/clsa-2026_1791334395.json" } ], "tracking": { "current_release_date": "2026-10-07T11:49:04Z", "generator": { "date": "2026-10-07T11:49:04Z", "engine": { "name": "pyCSAF" } }, "id": "CLSA-2026:1791334395", "initial_release_date": "2026-10-07T00:53:17Z", "revision_history": [ { "date": "2026-10-07T00:53:17Z", "number": "1", "summary": "Initial version" }, { "date": "2026-10-07T11:49:04Z", "number": "2", "summary": "Official Publication" } ], "status": "final", "version": "2" }, "title": "Fix CVE(s): CVE-2026-12505" }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Debian 11", "product": { "name": "Debian 11", "product_id": "Debian-11", "product_identification_helper": { "cpe": "cpe:2.3:o:debian:debian_linux:11:*:*:*:*:*:*:*" } } } ], "category": "product_family", "name": "Debian" } ], "category": "vendor", "name": "Software in the Public Interest, Inc." }, { "branches": [ { "branches": [ { "category": "product_version", "name": "cifs-utils-2:6.11-3.1+deb11u2+tuxcare.els1.armel", "product": { "name": "cifs-utils-2:6.11-3.1+deb11u2+tuxcare.els1.armel", "product_id": "cifs-utils-2:6.11-3.1+deb11u2+tuxcare.els1.armel", "product_identification_helper": { "purl": "pkg:deb/tuxcare/cifs-utils@2:6.11-3.1%2Bdeb11u2%2Btuxcare.els1?arch=armel" } } } ], "category": "architecture", "name": "armel" }, { "branches": [ { "category": "product_version", "name": "cifs-utils-2:6.11-3.1+deb11u2+tuxcare.els1.arm64", "product": { "name": "cifs-utils-2:6.11-3.1+deb11u2+tuxcare.els1.arm64", "product_id": "cifs-utils-2:6.11-3.1+deb11u2+tuxcare.els1.arm64", "product_identification_helper": { "purl": "pkg:deb/tuxcare/cifs-utils@2:6.11-3.1%2Bdeb11u2%2Btuxcare.els1?arch=arm64" } } } ], "category": "architecture", "name": "arm64" }, { "branches": [ { "category": "product_version", "name": "cifs-utils-2:6.11-3.1+deb11u2+tuxcare.els1.amd64", "product": { "name": "cifs-utils-2:6.11-3.1+deb11u2+tuxcare.els1.amd64", "product_id": "cifs-utils-2:6.11-3.1+deb11u2+tuxcare.els1.amd64", "product_identification_helper": { "purl": "pkg:deb/tuxcare/cifs-utils@2:6.11-3.1%2Bdeb11u2%2Btuxcare.els1?arch=amd64" } } } ], "category": "architecture", "name": "amd64" } ], "category": "vendor", "name": "TuxCare" } ], "relationships": [ { "category": "default_component_of", "full_product_name": { "name": "cifs-utils-2:6.11-3.1+deb11u2+tuxcare.els1.armel as a component of Debian 11", "product_id": "Debian-11:cifs-utils-2:6.11-3.1+deb11u2+tuxcare.els1.armel" }, "product_reference": "cifs-utils-2:6.11-3.1+deb11u2+tuxcare.els1.armel", "relates_to_product_reference": "Debian-11" }, { "category": "default_component_of", "full_product_name": { "name": "cifs-utils-2:6.11-3.1+deb11u2+tuxcare.els1.arm64 as a component of Debian 11", "product_id": "Debian-11:cifs-utils-2:6.11-3.1+deb11u2+tuxcare.els1.arm64" }, "product_reference": "cifs-utils-2:6.11-3.1+deb11u2+tuxcare.els1.arm64", "relates_to_product_reference": "Debian-11" }, { "category": "default_component_of", "full_product_name": { "name": "cifs-utils-2:6.11-3.1+deb11u2+tuxcare.els1.amd64 as a component of Debian 11", "product_id": "Debian-11:cifs-utils-2:6.11-3.1+deb11u2+tuxcare.els1.amd64" }, "product_reference": "cifs-utils-2:6.11-3.1+deb11u2+tuxcare.els1.amd64", "relates_to_product_reference": "Debian-11" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-12505", "cwe": { "id": "CWE-250", "name": "Execution with Unnecessary Privileges" }, "notes": [ { "category": "description", "text": "A flaw was found in the cifs-utils package where the cifs.upcall helper fails to securely drop its root privileges before looking up user information inside a user-controlled environment. A local, low privileged attacker can exploit this by using a crafted request_key payload to trick the root-owned helper into entering a custom environment (namespace) containing a malicious NSS module. This forces the system to load the attacker's controlled NSS Module and configuration, allowing them to execute arbitrary commands as the root user, elevating their privileges and fully compromising the system.", "title": "Vulnerability description" } ], "product_status": { "fixed": [ "Debian-11:cifs-utils-2:6.11-3.1+deb11u2+tuxcare.els1.amd64", "Debian-11:cifs-utils-2:6.11-3.1+deb11u2+tuxcare.els1.arm64", "Debian-11:cifs-utils-2:6.11-3.1+deb11u2+tuxcare.els1.armel" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-12505" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:32990", "url": "https://access.redhat.com/errata/RHSA-2026:32990" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:39575", "url": "https://access.redhat.com/errata/RHSA-2026:39575" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:39576", "url": "https://access.redhat.com/errata/RHSA-2026:39576" }, { "category": "external", "summary": "https://access.redhat.com/errata/RHSA-2026:44232", "url": "https://access.redhat.com/errata/RHSA-2026:44232" }, { "category": "external", "summary": "https://access.redhat.com/security/cve/CVE-2026-12505", "url": "https://access.redhat.com/security/cve/CVE-2026-12505" }, { "category": "external", "summary": "https://bugzilla.redhat.com/show_bug.cgi?id=2489805", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2489805" }, { "category": "external", "summary": "https://git.samba.org/?p=cifs-utils.git;a=commit;h=972c5b5ff95e3e812bc8daa72d0383654ab0dba7", "url": "https://git.samba.org/?p=cifs-utils.git;a=commit;h=972c5b5ff95e3e812bc8daa72d0383654ab0dba7" }, { "category": "external", "summary": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12505.json", "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12505.json" } ], "release_date": "2026-06-18T04:16:00Z", "remediations": [ { "category": "vendor_fix", "date": "2026-10-07T00:53:17.266109Z", "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1791334395", "product_ids": [ "Debian-11:cifs-utils-2:6.11-3.1+deb11u2+tuxcare.els1.amd64", "Debian-11:cifs-utils-2:6.11-3.1+deb11u2+tuxcare.els1.arm64", "Debian-11:cifs-utils-2:6.11-3.1+deb11u2+tuxcare.els1.armel" ], "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1791334395" } ], "threats": [ { "category": "impact", "details": "Important" } ] } ] }