{"id":44718,"date":"2025-05-26T13:45:21","date_gmt":"2025-05-26T13:45:21","guid":{"rendered":""},"modified":"2025-10-02T17:20:45","modified_gmt":"2025-10-02T23:20:45","slug":"cve-2024-46687-critical-use-after-free-vulnerability-in-linux-kernel-btrfs-file-system","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2024-46687-critical-use-after-free-vulnerability-in-linux-kernel-btrfs-file-system\/","title":{"rendered":"<strong>CVE-2024-46687: Critical Use-After-Free Vulnerability in Linux Kernel Btrfs File System<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>In this blog post, we delve into CVE-2024-46687, a critical vulnerability found in the Linux kernel. It primarily affects the Btrfs file system, a modern file system developed to address the needs of contemporary Linux systems. This <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-32310-privilege-escalation-vulnerability-in-thememove-quickcal-due-to-csrf\/\"  data-wpil-monitor-id=\"50475\">vulnerability is of particular concern due<\/a> to its potential to compromise system integrity or lead to data leakage. As Linux is widely used in servers worldwide, it&#8217;s crucial to understand and mitigate this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-4809-critical-vulnerability-in-tenda-ac7-router-leads-to-system-compromise\/\"  data-wpil-monitor-id=\"50598\">vulnerability swiftly to maintain system<\/a> security.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2024-46687<br \/>\nSeverity: High (7.8 CVSS Score)<br \/>\nAttack Vector: Local<br \/>\nPrivileges Required: Low<br \/>\nUser Interaction: None<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-22190-critical-gitpython-vulnerability-exposes-windows-systems-to-potential-compromise\/\"  data-wpil-monitor-id=\"51345\">Potential system<\/a> compromise or data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-750760119\" 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: 700px;\">\r\n  <h2 style=\"margin-top: 0; font-size: 20px; font-weight: 600; display: flex; align-items: center;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"display: inline-flex; align-items: center; margin-right: 8px;\">\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: 40px; height: 40px;\" \/>\r\n    <\/a>\r\n    A new way to communicate\r\n  <\/h2>\r\n\r\n  <p style=\"margin-bottom: 12px;\">\r\n    Ameeba Chat is built on encrypted identity, not personal profiles.\r\n  <\/p>\r\n\r\n  <p style=\"margin-bottom: 16px;\">\r\n    Message, call, share files, and coordinate with identities kept separate.\r\n  <\/p>\r\n\r\n  <ul style=\"list-style: none; padding-left: 0; margin-bottom: 20px;\">\r\n    <li>\u2022 Encrypted identity<\/li>\r\n    <li>\u2022 Ameeba Chat authenticates access<\/li>\r\n    <li>\u2022 Aliases and categories<\/li>\r\n    <li>\u2022 End-to-end encrypted chat, calls, and files<\/li>\r\n    <li>\u2022 Secure notes for sensitive information<\/li>\r\n  <\/ul>\r\n\r\n  <p style=\"font-style: italic; font-weight: 600; margin-bottom: 24px;\">\r\n    Private communication, rethought.\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: 6px; font-weight: 500;\">Download Ameeba Chat<\/a>\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"border: 1px solid #ffffff; color: #ffffff; padding: 10px 20px; text-decoration: none; border-radius: 6px; font-weight: 500;\">Learn More<\/a>\r\n  <\/div>\r\n<\/div>\r\n<\/div>\n<p>Product | Affected Versions<\/p>\n<p><a href=\"https:\/\/www.ameeba.com\/blog\/cve-2022-48913-linux-kernel-use-after-free-vulnerability-in-blktrace\/\"  data-wpil-monitor-id=\"52136\">Linux Kernel<\/a> | 6.11.0-rc2-next-20240805-default+ #76 and previous versions<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The vulnerability resides in the `btrfs_submit_chunk()` function, where an error can trigger a double freeing, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-0562-use-after-free-flaw-in-linux-kernel-potentially-leading-to-system-compromise\/\"  data-wpil-monitor-id=\"53669\">leading to a use-after-free<\/a> scenario. This <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-22040-race-condition-vulnerability-in-linux-kernel-resulting-in-potential-system-compromise\/\"  data-wpil-monitor-id=\"57857\">condition arises when a bio structure in the kernel<\/a> memory is prematurely freed, but a reference to it still exists. An attacker can exploit this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-43000-high-risk-conditional-access-vulnerability-in-promotion-management-wizard\/\"  data-wpil-monitor-id=\"51657\">condition and potentially gain unauthorized access<\/a>, modify data, or crash the system.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-675466582\" 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>Exploiting this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-52880-critical-vulnerability-in-insyde-insydeh2o-kernels-potentially-leading-to-system-compromise\/\"  data-wpil-monitor-id=\"51414\">vulnerability would typically involve a sequence of system<\/a> calls designed to trigger the error condition. While an exact exploit code is beyond the scope of this blog post, it would conceptually look like this in pseudocode:<\/p>\n<pre><code class=\"\" data-line=\"\">\/\/ Initialize bio structure\nbio_struct = init_bio();\n\/\/ Trigger the use-after-free vulnerability\ntrigger_uaf_vulnerability(bio_struct);\n\/\/ Exploit the use-after-free vulnerability\nexploit_uaf_vulnerability(bio_struct);<\/code><\/pre>\n<p>The `trigger_uaf_vulnerability()` function would involve operations that <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-23102-double-free-vulnerability-in-samsung-mobile-processors-leads-to-privilege-escalation\/\"  data-wpil-monitor-id=\"58767\">lead to the double<\/a> freeing condition in `btrfs_submit_chunk()`. The `exploit_uaf_vulnerability()` function would then attempt to use the freed `bio_struct` to gain <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-39350-unauthorized-access-vulnerability-in-rocket-apps-wproject\/\"  data-wpil-monitor-id=\"55659\">unauthorized access<\/a> or modify data.<\/p>\n<p><strong>Mitigation Guidance<\/strong><\/p>\n<p>To mitigate this vulnerability, users are advised to apply the vendor patch as soon as it becomes available. In the interim, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation. Regular system updates and adherence to security best practices can help prevent such <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-45997-exploiting-file-upload-vulnerability-in-web-based-pharmacy-product-management-system\/\"  data-wpil-monitor-id=\"56850\">vulnerabilities from being exploited<\/a>.<\/p>\n<p><strong>Conclusion<\/strong><\/p>\n<p>CVE-2024-46687 is a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47916-critical-remote-code-execution-vulnerability-in-invision-community-5-0-0\/\"  data-wpil-monitor-id=\"50405\">critical vulnerability<\/a> that underscores the importance of diligent system maintenance and security vigilance. By understanding its mechanics, we can better prepare and <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-36326-bypassing-amd-romarmor-protections-to-compromise-system-security\/\"  data-wpil-monitor-id=\"87927\">protect our systems<\/a> against such threats. Always stay informed about the latest <a href=\"https:\/\/www.ameeba.com\/blog\/unpacking-politico-s-weekly-cybersecurity-update-a-deep-dive-into-the-latest-threat-landscape\/\"  data-wpil-monitor-id=\"50530\">vulnerabilities<\/a> and ensure your systems are regularly patched and updated.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview In this blog post, we delve into CVE-2024-46687, a critical vulnerability found in the Linux kernel. It primarily affects the Btrfs file system, a modern file system developed to address the needs of contemporary Linux systems. This vulnerability is of particular concern due to its potential to compromise system integrity or lead to data [&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":[88],"product":[95],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-44718","post","type-post","status-publish","format-standard","hentry","category-uncategorized","vendor-linux","product-linux-kernel"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/44718","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=44718"}],"version-history":[{"count":14,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/44718\/revisions"}],"predecessor-version":[{"id":80738,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/44718\/revisions\/80738"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=44718"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=44718"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=44718"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=44718"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=44718"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=44718"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=44718"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=44718"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=44718"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}