{"id":56586,"date":"2025-07-02T01:57:55","date_gmt":"2025-07-02T01:57:55","guid":{"rendered":""},"modified":"2025-08-30T20:33:15","modified_gmt":"2025-08-31T02:33:15","slug":"cve-2025-52890-critical-acl-bypass-vulnerability-in-incus-system-container-and-virtual-machine-manager","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-52890-critical-acl-bypass-vulnerability-in-incus-system-container-and-virtual-machine-manager\/","title":{"rendered":"<strong>CVE-2025-52890: Critical ACL Bypass Vulnerability in Incus System Container and Virtual Machine Manager<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>The cyber world is under a significant threat from a recently disclosed vulnerability CVE-2025-52890. This vulnerability resides in the Incus system container and virtual machine manager, specifically affecting versions 6.12 and 6.13. The flaw lies in the generation of nftables rules that inadvertently bypass integral security options, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-4981-critical-file-extraction-vulnerability-in-mattermost-leading-to-potential-remote-code-execution\/\"  data-wpil-monitor-id=\"63073\">leading to potential<\/a> ARP spoofing and VM\/container spoofing on the same bridge. The reason this vulnerability is of <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-6292-critical-vulnerability-in-d-link-dir-825-2-03-leads-to-stack-based-buffer-overflow\/\"  data-wpil-monitor-id=\"63003\">critical<\/a> concern is because of its potential to compromise entire systems or lead to severe data leakage.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-52890<br \/>\nSeverity: Critical (CVSS: 8.1)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-5866-critical-vulnerability-in-rt-thread-5-1-0-potentially-leading-to-system-compromise-or-data-leakage\/\"  data-wpil-monitor-id=\"63807\">System compromise or significant data<\/a> leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-2460874180\" class=\"ameeb-content-2 ameeb-entity-placement\"><div style=\"border-left: 4px solid #555; padding-left: 20px; margin: 48px 0; font-family: Roboto, sans-serif; color: #ffffff; line-height: 1.6; max-width: 720px;\">\r\n  <h2 style=\"margin-top: 0; font-size: 22px; font-weight: 600; display: flex; align-items: center; letter-spacing: -0.02em;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"display: inline-flex; align-items: center; margin-right: 10px;\">\r\n      <img decoding=\"async\" src=\"https:\/\/www.ameeba.com\/blog\/wp-content\/uploads\/2025\/10\/Best-App-icon-Ameeba.png\" alt=\"Ameeba Chat Icon\" style=\"width: 42px; height: 42px;\" \/>\r\n    <\/a>\r\n    Share secrets securely\r\n  <\/h2>\r\n\r\n  <p style=\"margin-bottom: 14px; color: #d1d5db;\">\r\n    Ameeba is private infrastructure for communication and sensitive work built on encrypted identity instead of exposed corporate identity systems.\r\n  <\/p>\r\n\r\n  <p style=\"margin-bottom: 18px; color: #a1a1aa;\">\r\n    Passwords, credentials, confidential files, screenshots, internal discussions, sensitive AI context, and private coordination should not become exposed across ordinary communication platforms.\r\n  <\/p>\r\n\r\n  <ul style=\"list-style: none; padding-left: 0; margin-bottom: 24px; color: #e4e4e7;\">\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Encrypted identity<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Private Spaces for organizations and teams<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 End-to-end encrypted chat, calls, files, and notes<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Sensitive AI work and protected collaboration<\/li>\r\n    <li>\u2022 Built for information that cannot leak<\/li>\r\n  <\/ul>\r\n\r\n  <p style=\"font-style: italic; font-weight: 600; margin-bottom: 24px; color: #ffffff;\">\r\n    Our mission is to secure human work alongside AI.\r\n  <\/p>\r\n\r\n  <div style=\"display: flex; flex-wrap: wrap; gap: 12px;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\/download\" style=\"background-color: #ffffff; color: #000000; padding: 10px 20px; text-decoration: none; border-radius: 8px; font-weight: 500;\">\r\n      Download Ameeba\r\n    <\/a>\r\n\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"border: 1px solid #ffffff; color: #ffffff; padding: 10px 20px; text-decoration: none; border-radius: 8px; font-weight: 500;\">\r\n      Learn More\r\n    <\/a>\r\n  <\/div>\r\n<\/div><\/div>\n<p>Product | Affected Versions<\/p>\n<p>Incus <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-32975-quest-kace-systems-management-appliance-authentication-bypass-vulnerability\/\"  data-wpil-monitor-id=\"64136\">system container manager<\/a> | 6.12, 6.13<br \/>\nIncus <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-21445-memory-corruption-vulnerability-in-virtual-machines-leads-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"76023\">virtual machine<\/a> manager | 6.12, 6.13<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The vulnerability arises from a flaw in <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-45347-unauthorized-access-vulnerability-in-xiaomi-mi-connect-service-app\/\"  data-wpil-monitor-id=\"63583\">Incus&#8217;s generation of nftables rules when using an ACL<\/a> on a device connected to a bridge. These rules partially <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-22236-minion-event-bus-authorization-bypass-vulnerability-posing-serious-security-threats\/\"  data-wpil-monitor-id=\"63317\">bypass security<\/a> options like `security.mac_filtering`, `security.ipv4_filtering`, and `security.ipv6_filtering`. This <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-52817-authorization-bypass-in-zealousweb-abandoned-contact-form-7-leads-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"65714\">bypass can lead<\/a> to Address Resolution Protocol (ARP) spoofing on the bridge. The attacker could potentially exploit this vulnerability to fully spoof another VM\/container on the same bridge, leading to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49651-critical-unauthorized-access-vulnerability-in-backendai\/\"  data-wpil-monitor-id=\"63030\">unauthorized access<\/a> or data theft.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-1970529123\" class=\"ameeb-content ameeb-entity-placement\"><div class=\"poptin-embedded\" data-id=\"f6b387694f681\"><\/div>\r\n\r\n\r\n\r\n\r\n\r\n<\/div>\n<p>Suppose an attacker has <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-44955-critical-vulnerability-in-ruckus-network-director-allows-jail-users-to-gain-root-access\/\"  data-wpil-monitor-id=\"76022\">gained access to the network<\/a> and can send arbitrary packets. Given the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2015-0843-critical-buffer-overflow-vulnerability-in-yubiserver-before-version-0-6\/\"  data-wpil-monitor-id=\"65145\">vulnerable Incus versions<\/a> 6.12 or 6.13, they could send a specifically crafted ARP packet like this:<\/p>\n<pre><code class=\"\" data-line=\"\">arp -s [target IP] [attacker MAC] -i [bridge interface]<\/code><\/pre>\n<p>This command sends an ARP reply to the target, falsely associating the attacker&#8217;s MAC address with the target IP. Once this spoofing is accepted by the target, all traffic meant for the target IP could end up at the attacker&#8217;s machine, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-32878-critical-vulnerability-in-coros-pace-3-devices-leads-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"63183\">leading to potential system<\/a> compromise or data leakage.<\/p>\n<p><strong>Mitigation<\/strong><\/p>\n<p>To mitigate this vulnerability, it is advised to apply the vendor patch mentioned in commit 254dfd2483ab8de39b47c2258b7f1cf0759231c8. As an alternative or temporary mitigation, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview The cyber world is under a significant threat from a recently disclosed vulnerability CVE-2025-52890. This vulnerability resides in the Incus system container and virtual machine manager, specifically affecting versions 6.12 and 6.13. The flaw lies in the generation of nftables rules that inadvertently bypass integral security options, leading to potential ARP spoofing and VM\/container [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[],"product":[],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-56586","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/56586","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/comments?post=56586"}],"version-history":[{"count":11,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/56586\/revisions"}],"predecessor-version":[{"id":68497,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/56586\/revisions\/68497"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=56586"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=56586"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=56586"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=56586"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=56586"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=56586"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=56586"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=56586"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=56586"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}