{ "document":{ "aggregate_severity":{ "namespace":"https://nvd.nist.gov/vuln-metrics/cvss", "text":"HIGH" }, "category":"csaf_vex", "csaf_version":"2.0", "distribution":{ "tlp":{ "label":"WHITE", "url":"https:/www.first.org/tlp/" } }, "lang":"en", "notes":[ { "text":"['This has been assigned CVE-2026-46243, see', 'On Thursday, May 28th, 2026 at 12:07 AM, manizada wrote:', 'Hi folks,\\n\\nEmailing here now that the embargo agreed upon with linux-distros@ has expired.\\n\\nFlagging a local root vulnerability spanning both CIFS in the kernel and\\ncifs-utils in userspace (originally reported to kernel/cifs maintainers on May 16).\\nThe kernel-side (only) fix has now been public for over a week and is queued for stable:\\n\\n3da1fdf4efbc (\"smb: client: reject userspace cifs.spnego descriptions\")\\n\\nImpact:\\n Unprivileged user -> root code exec on any system where:\\n - cifs-utils is installed (with the default cifs.spnego rule)\\n - CIFS kernel module is loadable/compiled-in (typically the case), and\\n - unprivileged user/mount namespaces are enabled.\\n\\nSome default AppArmor/SELinux profiles block this.\\n\\nBug:\\n An unprivileged user can call request_key(\"cifs.spnego\", ...) with a forged\\n CIFS SPNEGO description. The request-key rule starts cifs.upcall as root.\\n cifs.upcall then trusts attacker-supplied pid, uid, creduid, and\\n upcall_target fields as if they came from kernel CIFS.\\n\\n For upcall_target=app, affected cifs-utils versions switch into the supplied\\n process\\'s namespaces and perform NSS lookup before final privilege drop.\\n A private mount namespace containing attacker-controlled /etc/nsswitch.conf\\n and libnss_*.so.2 is therefore sufficient for code execution in the root\\n helper.\\n\\nAffected distros:\\n This a non-exhaustive summary of some tested distros. The full table, including\\n the cases where stock policy blocks exploitation (but relaxing AppArmor/SELinux/etc.\\n enables exploitation), is in the attachment (and in an easier-to-read format in\\n the writeup linked below).\\n\\n Stock-default exploitable distros\\n (cifs-utils comes preinstalled in the profile + unprivileged namespaces permitted by default\\n + the AA/SELinux policies, if any, do not block the attack):\\n\\n - Linux Mint Cinnamon 21.3 and 22.3\\n - CentOS Stream 9 GNOME\\n - Rocky Linux 9 Workstation\\n - Kali Linux headless 2021.4/2022.4/2023.4/2024.4/2025.4/2026.1\\n - AlmaLinux 9.7 Workstation/Azure cloud image\\n - SLES 15 SP7/SAP 15 SP7/SAP 16\\n\\n Exploitable if cifs-utils is installed, with no other default config changes:\\n - Ubuntu 18.04/20.04/22.04 Desktop/Server\\n - Pop!_OS 22.04 Intel/24.04 Generic\\n - Ubuntu 24.04 Desktop minimal/full and Server\\n - Debian 11/12/13 netinst standard and GNOME/KDE/standard/XFCE\\n - CentOS Stream 9 Cinnamon/KDE/MATE/XFCE\\n - Rocky Linux 9 KDE/Workstation-Lite\\n - openSUSE Leap 15.6 GNOME/KDE\\n - openSUSE Tumbleweed GNOME/KDE\\n - Rocky Linux 8 GenericCloud\\n - Oracle Linux 8/9 KVM\\n - Amazon Linux 2023 KVM\\n\\nImmediate-term mitigations (aside from backporting the kernel fix):\\n - Blocking the CIFS module from loading (assuming it\\'s not built-in)/uninstalling cifs-utils if not used\\n - Deleting/overriding the default cifs.spnego request-key rule (if Kerberos cifs is not required),\\n e.g., after adjusting for your keyctl path:\\n\\n cat >/etc/request-key.d/cifs.spnego.conf <<\\'EOF\\'\\n create cifs.spnego * * /usr/sbin/keyctl negate %k 30 %S\\n EOF\\n\\n - Disabling unprivileged user namespaces\\n\\nThe CVE # assignment is still pending.\\n\\nFull writeup:', 'PoC to validate mitigations:', 'Thanks,\\n-Asim Manizada']", "category":"general", "title":"Synopsis" } ], "publisher":null, "references":[ { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46243" }, { "summary":"CVE-2026-46243 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2026/csaf-openeuler-cve-2026-46243.json" }, { "summary":"openEuler-SA-2026-2674", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2674" }, { "summary":"CVE-2026-46243", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-46243&packageName=kernel" } ], "title":"openEuler cve CVE-2026-46243", "tracking":{ "initial_release_date":"2026-06-18T16:38:50+08:00", "revision_history":[ { "date":"2026-06-18T16:38:50+08:00", "summary":"Initial", "number":"1.0.0" } ], "generator":{ "date":"2026-06-18T16:38:50+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, "current_release_date":"2026-06-18T16:38:50+08:00", "id":"CVE-2026-46243", "version":"1.0.0", "status":"interim" } }, "product_tree":{ "branches":[ { 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expired.\\n\\nFlagging a local root vulnerability spanning both CIFS in the kernel and\\ncifs-utils in userspace (originally reported to kernel/cifs maintainers on May 16).\\nThe kernel-side (only) fix has now been public for over a week and is queued for stable:\\n\\n3da1fdf4efbc (\"smb: client: reject userspace cifs.spnego descriptions\")\\n\\nImpact:\\n Unprivileged user -> root code exec on any system where:\\n - cifs-utils is installed (with the default cifs.spnego rule)\\n - CIFS kernel module is loadable/compiled-in (typically the case), and\\n - unprivileged user/mount namespaces are enabled.\\n\\nSome default AppArmor/SELinux profiles block this.\\n\\nBug:\\n An unprivileged user can call request_key(\"cifs.spnego\", ...) with a forged\\n CIFS SPNEGO description. The request-key rule starts cifs.upcall as root.\\n cifs.upcall then trusts attacker-supplied pid, uid, creduid, and\\n upcall_target fields as if they came from kernel CIFS.\\n\\n For upcall_target=app, affected cifs-utils versions switch into the supplied\\n process\\'s namespaces and perform NSS lookup before final privilege drop.\\n A private mount namespace containing attacker-controlled /etc/nsswitch.conf\\n and libnss_*.so.2 is therefore sufficient for code execution in the root\\n helper.\\n\\nAffected distros:\\n This a non-exhaustive summary of some tested distros. The full table, including\\n the cases where stock policy blocks exploitation (but relaxing AppArmor/SELinux/etc.\\n enables exploitation), is in the attachment (and in an easier-to-read format in\\n the writeup linked below).\\n\\n Stock-default exploitable distros\\n (cifs-utils comes preinstalled in the profile + unprivileged namespaces permitted by default\\n + the AA/SELinux policies, if any, do not block the attack):\\n\\n - Linux Mint Cinnamon 21.3 and 22.3\\n - CentOS Stream 9 GNOME\\n - Rocky Linux 9 Workstation\\n - Kali Linux headless 2021.4/2022.4/2023.4/2024.4/2025.4/2026.1\\n - AlmaLinux 9.7 Workstation/Azure cloud image\\n - SLES 15 SP7/SAP 15 SP7/SAP 16\\n\\n Exploitable if cifs-utils is installed, with no other default config changes:\\n - Ubuntu 18.04/20.04/22.04 Desktop/Server\\n - Pop!_OS 22.04 Intel/24.04 Generic\\n - Ubuntu 24.04 Desktop minimal/full and Server\\n - Debian 11/12/13 netinst standard and GNOME/KDE/standard/XFCE\\n - CentOS Stream 9 Cinnamon/KDE/MATE/XFCE\\n - Rocky Linux 9 KDE/Workstation-Lite\\n - openSUSE Leap 15.6 GNOME/KDE\\n - openSUSE Tumbleweed GNOME/KDE\\n - Rocky Linux 8 GenericCloud\\n - Oracle Linux 8/9 KVM\\n - Amazon Linux 2023 KVM\\n\\nImmediate-term mitigations (aside from backporting the kernel fix):\\n - Blocking the CIFS module from loading (assuming it\\'s not built-in)/uninstalling cifs-utils if not used\\n - Deleting/overriding the default cifs.spnego request-key rule (if Kerberos cifs is not required),\\n e.g., after adjusting for your keyctl path:\\n\\n cat >/etc/request-key.d/cifs.spnego.conf <<\\'EOF\\'\\n create cifs.spnego * * /usr/sbin/keyctl negate %k 30 %S\\n EOF\\n\\n - Disabling unprivileged user namespaces\\n\\nThe CVE # assignment is still pending.\\n\\nFull writeup:', 'PoC to validate mitigations:', 'Thanks,\\n-Asim Manizada']", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":[ 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"openEuler-22.03-LTS-SP4:kernel-5.10.0-318.0.0.221.oe2203sp4.src" ] } ], "threats":[ { "details":"High", "category":"impact" } ], "title":"CVE-2026-46243" } ] }