{"id":"OESA-2026-4154","summary":"glibc security update","details":"The GNU C Library project provides the core libraries for the GNU system and GNU/Linux systems, as well as many other systems that use Linux as the kernel. These libraries provide critical APIs including ISO C11, POSIX.1-2008, BSD, OS-specific APIs and more. These APIs include such foundational facilities as open, read, write, malloc, printf, getaddrinfo, dlopen, pthread_create, crypt,  login, exit and more.\r\n\r\nSecurity Fix(es):\n\nA 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.(CVE-2026-86805)\n\nA 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.\n\nWhen 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-2026-95818)","modified":"2026-10-01T02:00:03.613649576Z","published":"2026-09-30T13:47:07Z","upstream":["CVE-2026-86805","CVE-2026-95818"],"database_specific":{"severity":"Medium"},"references":[{"type":"ADVISORY","url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4154"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-86805"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-95818"}],"affected":[{"package":{"name":"glibc","ecosystem":"openEuler:24.03-LTS-SP3","purl":"pkg:rpm/openEuler/glibc&distro=openEuler-24.03-LTS-SP3"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.38-128.oe2403sp3"}]}],"ecosystem_specific":{"noarch":["glibc-help-2.38-128.oe2403sp3.noarch.rpm"],"src":["glibc-2.38-128.oe2403sp3.src.rpm"],"x86_64":["glibc-2.38-128.oe2403sp3.x86_64.rpm","glibc-all-langpacks-2.38-128.oe2403sp3.x86_64.rpm","glibc-common-2.38-128.oe2403sp3.x86_64.rpm","glibc-debuginfo-2.38-128.oe2403sp3.x86_64.rpm","glibc-debugsource-2.38-128.oe2403sp3.x86_64.rpm","glibc-debugutils-2.38-128.oe2403sp3.x86_64.rpm","glibc-devel-2.38-128.oe2403sp3.x86_64.rpm","glibc-locale-archive-2.38-128.oe2403sp3.x86_64.rpm","glibc-locale-source-2.38-128.oe2403sp3.x86_64.rpm","glibc-nss-devel-2.38-128.oe2403sp3.x86_64.rpm","libnsl-2.38-128.oe2403sp3.x86_64.rpm","nscd-2.38-128.oe2403sp3.x86_64.rpm","nss_modules-2.38-128.oe2403sp3.x86_64.rpm"],"aarch64":["glibc-2.38-128.oe2403sp3.aarch64.rpm","glibc-all-langpacks-2.38-128.oe2403sp3.aarch64.rpm","glibc-common-2.38-128.oe2403sp3.aarch64.rpm","glibc-debuginfo-2.38-128.oe2403sp3.aarch64.rpm","glibc-debugsource-2.38-128.oe2403sp3.aarch64.rpm","glibc-debugutils-2.38-128.oe2403sp3.aarch64.rpm","glibc-devel-2.38-128.oe2403sp3.aarch64.rpm","glibc-locale-archive-2.38-128.oe2403sp3.aarch64.rpm","glibc-locale-source-2.38-128.oe2403sp3.aarch64.rpm","glibc-nss-devel-2.38-128.oe2403sp3.aarch64.rpm","libnsl-2.38-128.oe2403sp3.aarch64.rpm","nscd-2.38-128.oe2403sp3.aarch64.rpm","nss_modules-2.38-128.oe2403sp3.aarch64.rpm"]},"database_specific":{"source":"https://repo.openeuler.org/security/data/osv/OESA-2026-4154.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"}]}