An update for glibc is now available for openEuler-22.03-LTS-SP4 Security Advisory openeuler-security@openeuler.org openEuler security committee openEuler-SA-2026-4152 Final 1.0 1.0 2026-09-30 Initial 2026-09-30 2026-09-30 openEuler SA Tool V1.0 2026-09-30 glibc security update An update for glibc is now available for openEuler-22.03-LTS-SP4 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. Security Fix(es): 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-2026-86805) 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-2026-95818) An update for glibc is now available for openEuler-22.03-LTS-SP4. openEuler Security has rated this update as having a security impact of medium. A Common Vunlnerability Scoring System(CVSS)base score,which gives a detailed severity rating, is available for each vulnerability from the CVElink(s) in the References section. Medium glibc https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4152 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-86805 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-95818 https://nvd.nist.gov/vuln/detail/CVE-2026-86805 https://nvd.nist.gov/vuln/detail/CVE-2026-95818 openEuler-22.03-LTS-SP4 glibc-2.34-186.oe2203sp4.aarch64.rpm glibc-all-langpacks-2.34-186.oe2203sp4.aarch64.rpm glibc-common-2.34-186.oe2203sp4.aarch64.rpm glibc-compat-2.17-2.34-186.oe2203sp4.aarch64.rpm glibc-debuginfo-2.34-186.oe2203sp4.aarch64.rpm glibc-debugsource-2.34-186.oe2203sp4.aarch64.rpm glibc-debugutils-2.34-186.oe2203sp4.aarch64.rpm glibc-devel-2.34-186.oe2203sp4.aarch64.rpm glibc-locale-archive-2.34-186.oe2203sp4.aarch64.rpm glibc-locale-source-2.34-186.oe2203sp4.aarch64.rpm glibc-nss-devel-2.34-186.oe2203sp4.aarch64.rpm libnsl-2.34-186.oe2203sp4.aarch64.rpm nscd-2.34-186.oe2203sp4.aarch64.rpm nss_modules-2.34-186.oe2203sp4.aarch64.rpm glibc-2.34-186.oe2203sp4.src.rpm glibc-2.34-186.oe2203sp4.x86_64.rpm glibc-all-langpacks-2.34-186.oe2203sp4.x86_64.rpm glibc-common-2.34-186.oe2203sp4.x86_64.rpm glibc-compat-2.17-2.34-186.oe2203sp4.x86_64.rpm glibc-debuginfo-2.34-186.oe2203sp4.x86_64.rpm glibc-debugsource-2.34-186.oe2203sp4.x86_64.rpm glibc-debugutils-2.34-186.oe2203sp4.x86_64.rpm glibc-devel-2.34-186.oe2203sp4.x86_64.rpm glibc-locale-archive-2.34-186.oe2203sp4.x86_64.rpm glibc-locale-source-2.34-186.oe2203sp4.x86_64.rpm glibc-nss-devel-2.34-186.oe2203sp4.x86_64.rpm libnsl-2.34-186.oe2203sp4.x86_64.rpm nscd-2.34-186.oe2203sp4.x86_64.rpm nss_modules-2.34-186.oe2203sp4.x86_64.rpm glibc-help-2.34-186.oe2203sp4.noarch.rpm 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. 2026-09-30 CVE-2026-86805 openEuler-22.03-LTS-SP4 Medium 6.3 AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:L glibc security update 2026-09-30 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4152 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. 2026-09-30 CVE-2026-95818 openEuler-22.03-LTS-SP4 Low 3.6 AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N glibc security update 2026-09-30 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4152