{"id":67853,"date":"2025-08-11T21:31:38","date_gmt":"2025-08-11T18:01:38","guid":{"rendered":"https:\/\/afaghhosting.net\/blog\/cve-2025-38499-linux-kernel-clone-private-mnt-userns-privilege-escalation-vulnerability\/"},"modified":"2025-08-11T21:31:38","modified_gmt":"2025-08-11T18:01:38","slug":"cve-2025-38499-linux-kernel-clone-private-mnt-userns-privilege-escalation-vulnerability","status":"publish","type":"post","link":"https:\/\/afaghhosting.net\/blog\/cve-2025-38499-linux-kernel-clone-private-mnt-userns-privilege-escalation-vulnerability\/","title":{"rendered":"CVE-2025-38499 &#8211; Linux Kernel Clone Private Mnt userns Privilege Escalation Vulnerability"},"content":{"rendered":"<p><strong>CVE ID : <\/strong>CVE-2025-38499<br \/>\n<br \/>\n<strong>Published : <\/strong> Aug. 11, 2025, 4:15 p.m. | 1\u00a0hour, 29\u00a0minutes ago<br \/>\n<br \/>\n<strong>Description : <\/strong>In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>clone_private_mnt(): make sure that caller has CAP_SYS_ADMIN in the right userns<\/p>\n<p>What we want is to verify there is that clone won&#8217;t expose something<br \/>\nhidden by a mount we wouldn&#8217;t be able to undo.  &#8220;Wouldn&#8217;t be able to undo&#8221;<br \/>\nmay be a result of MNT_LOCKED on a child, but it may also come from<br \/>\nlacking admin rights in the userns of the namespace mount belongs to.<\/p>\n<p>clone_private_mnt() checks the former, but not the latter.<\/p>\n<p>There&#8217;s a number of rather confusing CAP_SYS_ADMIN checks in various<br \/>\nuserns during the mount, especially with the new mount API; they serve<br \/>\ndifferent purposes and in case of clone_private_mnt() they usually,<br \/>\nbut not always end up covering the missing check mentioned above.<br \/>\n<br \/>\n<strong>Severity:<\/strong> 0.0 | NA<br \/>\n<br \/>\nVisit the link for more details, such as CVSS details, affected products, timeline, and more&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>CVE ID : CVE-2025-38499 Published : Aug. 11, 2025, 4:15 p.m. | 1\u00a0hour, 29\u00a0minutes ago Description : In the Linux kernel, the following vulnerability has been resolved: clone_private_mnt(): make sure that caller has CAP_SYS_ADMIN in the right userns What we want is to verify there is that clone won&#8217;t expose something hidden by a mount &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-67853","post","type-post","status-publish","format-standard","hentry","category-vulnerability"],"_links":{"self":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/67853","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/comments?post=67853"}],"version-history":[{"count":0,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/67853\/revisions"}],"wp:attachment":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/media?parent=67853"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/categories?post=67853"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/tags?post=67853"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}