The following security advisories have been published:
GLIBC-SA-2026-0022: =================== AT_SECURE programs may load attacker-controlled code via $ORIGIN 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. 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. CVE-Id: CVE-2026-86805 Public-Date: 2026-07-06 Vulnerable-Commit: 47c3cd7a74e8c089d60d603afce6d9cf661178d6 (2.13-113) Fix-Commit: ed0c137b97eb940b4b64981e84ed806d3276edd9 (2.45) Reported-by: Jann Horn <[email protected]> CVSS: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:L - 6.3 GLIBC-SA-2026-0023: =================== AT_SECURE program buffer overflow via $ORIGIN processing A stack-based buffer overflow in the dynamic loader (ld.so) of the GNU C Library (glibc) versions 2.14 through 2.44 allows a local attacker to crash or corrupt the memory of setuid/setgid (AT_SECURE) programs. When such a program's DT_RPATH or DT_RUNPATH begins with $ORIGIN and is followed by NUL or '/' the loader both reads past the end of the path buffer and writes past the end of a stack-allocated internal buffer. The corrupted loader stack can lead to a loader crash (denial of service) and limited disclosure of process memory. CVE Id: CVE-2026-95818 Public-Date: 2026-08-14 Vulnerable-Commit: 47c3cd7a74e8c089d60d603afce6d9cf661178d6 (2.13-113) Fix-Commit: ed0c137b97eb940b4b64981e84ed806d3276edd9 (2.45) Reported-by: AISLE in partnership with Red Hat CVSS: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N - 3.6
