{"id":49550,"date":"2025-06-08T03:52:09","date_gmt":"2025-06-08T03:52:09","guid":{"rendered":""},"modified":"2025-08-31T18:38:11","modified_gmt":"2025-09-01T00:38:11","slug":"cve-2022-49840-in-depth-analysis-of-linux-kernel-vulnerability-and-its-mitigation","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2022-49840-in-depth-analysis-of-linux-kernel-vulnerability-and-its-mitigation\/","title":{"rendered":"<strong>CVE-2022-49840: In-depth Analysis of Linux Kernel Vulnerability and its Mitigation<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>In the realm of cybersecurity, understanding and mitigating vulnerabilities is crucial. One such vulnerability, CVE-2022-49840, has been identified in the Linux kernel, affecting the bpf_prog_test_run_skb() function. This <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-5124-critical-vulnerability-in-sony-s-snc-series-cameras-due-to-use-of-default-credentials\/\"  data-wpil-monitor-id=\"56459\">vulnerability is of significant concern due<\/a> to its high CVSS Severity Score of 7.8, indicating its potential impact on the integrity and availability of the system. The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-5100-a-double-free-vulnerability-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"56623\">vulnerability affects a broad range of Linux-based systems<\/a> and servers, making it a critical issue that requires immediate attention.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2022-49840<br \/>\nSeverity: High (7.8)<br \/>\nAttack Vector: Local<br \/>\nPrivileges Required: Low<br \/>\nUser Interaction: None<br \/>\nImpact: Potential system compromise or <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-48383-django-select2-vulnerability-risking-data-leakage-and-unauthorized-access\/\"  data-wpil-monitor-id=\"56107\">data leakage<\/a><\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-1399474101\" 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-2025-21879-the-linux-kernel-btrfs-use-after-free-vulnerability\/\"  data-wpil-monitor-id=\"56545\">Linux Kernel<\/a> | Versions prior to 5.15<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The vulnerability arises due to an alignment problem in the bpf_prog_test_run_skb() function in the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2021-47668-linux-kernel-vulnerability-leading-to-potential-system-compromise-or-data-leakage\/\"  data-wpil-monitor-id=\"57512\">Linux kernel<\/a>. When the size from user bpf program is an odd number, it causes unaligned access to the struct skb_shared_info, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-1884-use-after-free-vulnerability-in-solidworks-edrawings-leads-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"58159\">leading to a use-after-free<\/a> read. This situation <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-32309-potential-system-compromise-due-to-remote-file-inclusion-in-php-program\/\"  data-wpil-monitor-id=\"56271\">potentially leads to system compromise<\/a> or data leakage.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-2485154189\" 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>This section does not apply in this context as the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-46458-critical-cross-site-request-forgery-csrf-vulnerability-leading-to-sql-injection-in-occupancyplan\/\"  data-wpil-monitor-id=\"55481\">vulnerability is not exploited via HTTP requests<\/a> or similar methods. It&#8217;s a kernel-based <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=\"57513\">vulnerability which can be exploited<\/a> programmatically at a low level.<\/p>\n<p><strong><a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-21453-critical-memory-corruption-vulnerability-impacting-multiple-systems\/\"  data-wpil-monitor-id=\"58966\">Impact of Vulnerability<\/a><\/strong><\/p>\n<p>If successfully exploited, this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-27010-path-traversal-vulnerability-in-bslthemes-tastyc-leading-to-php-local-file-inclusion\/\"  data-wpil-monitor-id=\"55821\">vulnerability could lead<\/a> to system compromise or data leakage. Attackers could potentially gain <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-39350-unauthorized-access-vulnerability-in-rocket-apps-wproject\/\"  data-wpil-monitor-id=\"55629\">unauthorized access<\/a> to sensitive information or take control of the affected system, causing significant disruption and potential loss of data.<\/p>\n<p><strong>Mitigation and Prevention<\/strong><\/p>\n<p>To mitigate this vulnerability, users are advised to apply the vendor-provided patch which adjusts the size so that it becomes a multiple of SMP_CACHE_BYTES, ensuring the struct skb_shared_info is aligned to a cache line. As a temporary mitigation, the use of a Web Application Firewall (WAF) or Intrusion Detection System (IDS) is recommended.<\/p>\n<p><strong>Conclusion<\/strong><\/p>\n<p>The CVE-2022-49840 <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-21893-critical-linux-kernel-vulnerability-in-key-put-function\/\"  data-wpil-monitor-id=\"56813\">vulnerability within the Linux kernel<\/a> underscores the importance of proactive cybersecurity measures. Ensuring regular system updates and patches, coupled with robust monitoring systems, is essential in mitigating potential threats. While the vendor has <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-4578-sql-injection-vulnerability-in-file-provider-wordpress-plugin\/\"  data-wpil-monitor-id=\"58839\">provided a patch for this specific vulnerability<\/a>, it serves as a reminder that even the most robust systems are not impervious to attacks. As technology continues to evolve, so do the <a href=\"https:\/\/www.ameeba.com\/blog\/alabama-state-government-faces-cybersecurity-threat-a-detailed-analysis\/\"  data-wpil-monitor-id=\"56108\">threats that we face<\/a>. Therefore, staying informed and vigilant is our best <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-20217-denial-of-service-vulnerability-in-snort-3-detection-engine-of-cisco-secure-firewall-threat-defense-software\/\"  data-wpil-monitor-id=\"77073\">defense against potential cyber threats<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview In the realm of cybersecurity, understanding and mitigating vulnerabilities is crucial. One such vulnerability, CVE-2022-49840, has been identified in the Linux kernel, affecting the bpf_prog_test_run_skb() function. This vulnerability is of significant concern due to its high CVSS Severity Score of 7.8, indicating its potential impact on the integrity and availability of the system. The [&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-49550","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\/49550","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=49550"}],"version-history":[{"count":14,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/49550\/revisions"}],"predecessor-version":[{"id":69454,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/49550\/revisions\/69454"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=49550"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=49550"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=49550"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=49550"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=49550"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=49550"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=49550"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=49550"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=49550"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}