{"id":"CVE-2026-86805","summary":"AT_SECURE programs may load attacker-controlled code via $ORIGIN","details":"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.\n\nExploitation requires an installed setuid or setgid binary whose DT_RPATH uses $ORIGIN followed by \"..\" 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.","modified":"2026-09-23T03:47:27.809004536Z","published":"2026-09-22T15:55:17.117Z","database_specific":{"cwe_ids":["CWE-367"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86805.json","unresolved_ranges":[{"extracted_events":[{"introduced":"2.14"},{"fixed":"2.45"}],"source":"AFFECTED_FIELD"}],"cna_assigner":"glibc"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86805.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-86805"},{"type":"REPORT","url":"https://sourceware.org/bugzilla/show_bug.cgi?id=34360"},{"type":"ADVISORY","url":"https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0022"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://sourceware.org/git/glibc.git","events":[{"introduced":"356f8bc660a154a07b03da7c536831da5c8f74fe"},{"fixed":"c3a3a9808ad3ab4a3336836833f83288b672ccbf"}],"database_specific":{"source":"DESCRIPTION","extracted_events":[{"introduced":"2.14"},{"fixed":"2.44"}]}}],"versions":["glibc-2.43.9000","glibc-2.43","glibc-2.42","glibc-2.42.9000","glibc-2.41.9000","glibc-2.41","glibc-2.40","glibc-2.40.9000","glibc-2.39.9000","glibc-2.39","glibc-2.38","glibc-2.38.9000","glibc-2.37","glibc-2.37.9000","glibc-2.36","glibc-2.36.9000","glibc-2.35","glibc-2.35.9000","glibc-2.34","glibc-2.34.9000","glibc-2.33","glibc-2.33.9000","glibc-2.32","glibc-2.32.9000","glibc-2.31","glibc-2.31.9000","changelog-ends-here","glibc-2.30","glibc-2.30.9000","glibc-2.29","glibc-2.29.9000","glibc-2.28","glibc-2.28.9000","glibc-2.27","glibc-2.27.9000","glibc-2.26","glibc-2.26.9000","glibc-2.25","glibc-2.25.90","glibc-2.24","glibc-2.24.90","glibc-2.23","glibc-2.23.90","glibc-2.22","glibc-2.22.90","glibc-2.21","glibc-2.21.90","glibc-2.20","glibc-2.20.90","glibc-2.19","glibc-2.19.90","glibc-2.18","glibc-2.18.90","glibc-2.17","glibc-2.17.90","glibc-2.16.0","glibc-2.16.90","glibc-2.16-ports-merge","glibc-2.16","glibc-2.16-tps","glibc-2.15","glibc-2.14.9000","glibc-2.14"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-86805.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:L"}]}