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        "state": "PUBLISHED",
        "assignerShortName": "glibc",
        "dateReserved": "2026-09-08T12:56:00.982Z",
        "datePublished": "2026-09-22T15:55:17.117Z",
        "dateUpdated": "2026-09-23T03:55:58.505Z"
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                "dateUpdated": "2026-09-22T16:42:16.362Z"
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            "title": "AT_SECURE programs may load attacker-controlled code via $ORIGIN",
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                            "lang": "en",
                            "cweId": "CWE-367",
                            "description": "CWE-367 Time-of-check time-of-use (TOCTOU) race condition",
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                            "value": "CAPEC-233 Privilege Escalation"
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                    "vendor": "The GNU C Library",
                    "product": "glibc",
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                            "version": "2.14",
                            "lessThan": "2.45",
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                    "value": "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.",
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                            "value": "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.<br><br>Exploitation 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."
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            "references": [
                {
                    "url": "https://sourceware.org/bugzilla/show_bug.cgi?id=34360",
                    "tags": [
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                {
                    "url": "https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0022",
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