{"id":27550,"date":"2026-09-23T00:31:19","date_gmt":"2026-09-22T16:31:19","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-86805"},"modified":"2026-09-23T00:31:19","modified_gmt":"2026-09-22T16:31:19","slug":"cve-2026-86805","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-86805","title":{"rendered":"CVE-2026-86805 [HIGH] &#8211; A time-of-check to time-of-use (TOCTOU) race condition in the dynamic loader (ld.so) of th"},"content":{"rendered":"<p>A time-of-check to time-of-use (TOCTOU) race condition in the dynamic loader (ld.so) of the GNU C Library (glibc) versions 2.14 through 2.44 allows a local attacker to escalate privileges. When expanding $ORIGIN in DT_RPATH for setuid\/setgid (AT_SECURE) programs, glibc validates the lexically normalized search path against the trusted directories but then opens the raw, un-normalized path. On systems where the Linux fs.protected_hardlinks sysctl is disabled, a local attacker who hard-links such a program into an attacker-controlled directory and wins a race to replace an intermediate path component with a symbolic link can direct the loader outside the trusted directory, causing it to load an attacker-controlled shared object and execute arbitrary code with the elevated privileges of the program.<\/p>\n<p>Exploitation requires an installed setuid or setgid binary whose DT_RPATH uses $ORIGIN followed by &#8220;..&#8221; traversal that normalizes into a trusted directory, and the ability to hard-link that binary and win the race by swapping a path component for a symbolic link. Major Linux-based OS distributions ship with fs.protected_hardlinks enabled by default and mitigate the vulnerability.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A time-of-check to time-of-use (TOCTOU) race condition in the dynamic loader (ld.so) of the GNU C Library (glibc) versions 2.14 through 2.44 allows a local attacker to escalate privileges. When expand<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-27550","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/27550","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=27550"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=27550"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=27550"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}