The GNU C Library ================= The GNU C Library version 2.44 is now available.
The GNU C Library is used as *the* C library in the GNU system and in GNU/Linux systems, as well as many other systems that use Linux as the kernel. The GNU C Library is primarily designed to be a portable and high performance C library. It follows all relevant standards including ISO C23 and POSIX.1-2024. It is also internationalized and has one of the most complete internationalization interfaces known. The GNU C Library website is at http://www.gnu.org/software/libc/ Packages for the 2.44 release may be downloaded from: http://ftpmirror.gnu.org/libc/ http://ftp.gnu.org/gnu/libc/ The mirror list is at http://www.gnu.org/order/ftp.html Distributions are encouraged to track the release/* branches corresponding to the releases they are using. The release branches will be updated with conservative bug fixes and new features while retaining backwards compatibility. NEWS for version 2.44 ===================== Major new features: * System-wide tunables can be applied using /etc/tunables.conf and running ldconfig. Specific tunable settings and the /etc/tunables.conf file format and path are not part of the stable library interfaces and may change between releases. * A new tunable, glibc.elf.thp, is added to map read-only segments with Transparent Huge Pages (THP) if THP is not disabled in the kernel. When glibc.elf.thp is set to 1, malloc uses the actual kernel THP mode instead of defaulting to madvise mode and madvise_thp will stop issuing MADV_HUGEPAGE if kernel THP mode is always. * The THP page size in malloc is capped to MAX_THP_PAGESIZE. If the THP page size is above MAX_THP_PAGESIZE, THP in malloc is disabled. * Additional optimized and correctly rounded mathematical functions have been imported from the CORE-MATH project, in particular cosh, sinh, and tanh. * Many additional improvements to existing functions have been synchronized from the CORE-MATH project. * For C++26, the assert macro is now variadic, allowing more complex arguments containing commas (which however still must evaluate to a single value). * The SVID error handling for cosh and sinh was moved to compatibility symbols, allowing improvements in performance. * Static PIE is now supported for arm-*-linux-gnueabi. It requires toolchain support to correctly set the expected linker options. * On AArch64 targets that support the Guarded Control Stack extension all GCS operations (including status, write on shadow stack, and push to shadow stack) are locked after enabling GCS with ENFORCED or OVERRIDE GCS policy. When a GCS operation is locked, a program cannot change this operation status via the prctl syscall. This prevents disabling or corrupting the GCS shadow stack during runtime. * On AArch64 targets, log, exp, sin, cas, sinh, cosh, asinh, acosh, atanh single and double precision special cases have been vectorized for SVE and AdvSIMD, and vector variants of powr have been added. * On RISC-V targets, vector extension optimized variants of memcmp, memccpy, memchr, memcpy, memmove, stpncpy, strcmp, strchr, strcpy, strncmp, strncpy, strlen, and strrchr have been added. * On PowerPC, memchr optimized for Power10 has been re-added. * Support for LoongArch32 has been added. * Pre-built ld.so.cache files can be installed with ldconfig. * A new locale has been added: hrx_BR (Hunsrik language spoken in Brazil). Deprecated and removed features, and other changes affecting compatibility: * Although malloc and related functions currently return pointers aligned to alignof (max_align_t), the documentation now says future versions of glibc may relax alignment requirements for small allocations. For example, a future malloc(1) might return a pointer with odd alignment, because no object of size 1 can have a fundamental alignment greater than 1. * The s390-linux-gnu (31bit) configuration is no longer supported. * The --enable-memory-tagging configure option has been removed. The corresponding AArch64-specific functionality that was previously activated by this flag has been removed as well. * The --enable-static-nss configure option has been removed. It had no effect on the build since the NSS reorganization in glibc 2.33; its only remaining behavior was to suppress the link-time warnings on the NSS interface functions in libc.a, which are now emitted unconditionally. Security related changes: The following CVEs were fixed in this release, details of which can be found in the advisories directory of the release tarball: GLIBC-SA-2026-0005: gethostbyaddr and gethostbyaddr_r may incorrectly handle DNS response (CVE-2026-4437) GLIBC-SA-2026-0006: gethostbyaddr and gethostbyaddr_r return invalid DNS hostnames (CVE-2026-4438) GLIBC-SA-2026-0007: iconv crash due to assertion failure with untrusted input (CVE-2026-4046) The following bugs were resolved with this release: [2363] libc: EOPNOTSUPP and ENOTSUP in errno.h must be different, according to SUSv3 [3794] manual: iconv: //TRANSLIT and //IGNORE feature not documented [15792] dynamic-link: [arm] ARM dynamic linker should save/restore coprocessor registers [20331] libc: fts ignores errors from readdir() [20680] dynamic-link: ifunc resolver cannot access the thread pointer with static linking [22944] libc: fts cannot traverse paths which have a length longer than USHRT_MAX [25257] libc: sotruss: fix error message for '--f' argument [25770] locale: newlocale memory leak in LOCPATH parsing and on error paths [27582] libc: x86_64: IFUNC in static user programs may crash when built with -fstack-protector-all [28218] dynamic-link: ld.so: ifunc resolver calls a lazy PLT. When does it work? [28817] libc: static-pie ifunc resolver tls failure [28940] nss: __nss_database_get doesn't check for allocation failure [30136] manual: Please document behaviour of iconv(3) when input is untranslatable [30304] nptl: nptl/tst-pthread-gdb-attach test fails with new libc shared library version [30769] malloc: malloc_trim is not working correctly for arenas other than arena 0 [30976] dynamic-link: rtld: resolve ifunc relocations after JUMP_SLOT/GLOB_DAT/etc [30992] libc: alpha: setrlimit() with negative values besides RLIM_INFINITY returns EPERM [31901] libc: elf/tst-glibc-hwcaps-prepend-cache fails on i686 [33226] math: math-vector-fortran.h vs not ffast-math [33626] libc: execvpe should skip inaccessible $PATH components [33650] build: abilist.awk doesn't handle unversioned defined symbols [33785] stdio: New streams are linked into global list before they are fully initialized [33848] build: Build fails at openat2.h, redefinition of 'struct open_how' [33882] libc: Recursion in nftw() causes stack overflow(CWE-674) [33904] build: error: '__vasprintf_chk' undeclared here [33921] build: Building with Linux-7.0-rc1 errors on OPEN_TREE_CLONE [33935] stdio: _IO_wfile_doallocate not linked correctly when linking glibc statically [33980] locale: iconv: ibm139x trigger assertion error when converting to internal while lack enough room (CVE-2026-4046) [33985] build: ld: cannot find -lgcc_s: No such file or directory [33999] stdio: libio: potential dangling _IO_save_base or memory leak in wgenops.c [34006] stdio: libio: inconsistent fmemopen_write behavior on last \0 [34008] stdio: stdio-common: scanf %mc pattern will cause heap overflow when width > 1024 [34014] nss: gethostbyaddr and gethostbyaddr_r may incorrectly handle DNS response [34015] nss: gethostbyaddr and gethostbyaddr_r return invalid DNS hostnames [34019] stdio: libio: undefined behavior when setbuf on open_memstream [34033] network: resolv/ns_print.c: ns_sprintrrf TSIG path bypasses buflen and can overflow caller buffer [34064] dynamic-link: The unnecessary PT_NOTE check in when loading a binary [34069] network: Buffer overread in ns_sprintrrf with corrupted RDATA field (CVE-2026-6238) [34070] hurd: Calling open ("/dev/tty/", O_RDONLY) causes the program to segfault [34073] regex: regexec can mistakenly match with backrefs and the $ anchor [34079] dynamic-link: THP segment load aligns all PT_LOAD segments to THP page size [34080] dynamic-link: Support THP segment load with THP enabled with madvise [34083] dynamic-link: __get_thp_mode and __get_thp_size are called twice [34090] libc: wordexp WRDE_APPEND rollback restores stale we_wordv, leading to invalid free in wordfree [34098] libc: Missing SUPPORT_STATIC_PIE in arm32 [34129] string: x86: Non-temporal memset unreachable on AMD Zen 3/4/5 [34144] libc: ld.so clobbers VFP registers during runtime linking [34154] network: Segfault in sock_eq after res_init() returns -1, due to stale _u._ext.nscount in __res_iclose [34156] dynamic-link: dlsym(RTLD_DEFAULT, ...) from a constructor SIGSEGVs when tail-called [34164] dynamic-link: elf: IFUNC resolvers do not see static TLS initialization [34170] dynamic-link: elf: IFUNC resolver reading global- dynamic/TLSDESC __thread variable crashes inside __tls_get_addr [34183] math: fma produces wrong results [34192] nptl: pthread_setname_np opens /proc/<tid>/comm with O_RDWR instead of O_WRONLY|O_CLOEXEC [34196] libc: elf: static dlopen: pointer guard of the loaded ld.so/libc.so is left uninitialized [34197] dynamic-link: elf: Stack canary and pointer guard are recoverable from AT_RANDOM (getauxval) [34205] libc: aarch64: SIGSEGV in tunable_strcmp in static-pie binaries run with a string tunable [34208] stdio: scanf not pushback after matching failure [34210] libc: elf/tst-glibc-hwcaps-prepend-cache fails on armv7a-unknown-linux-gnueabihf [34236] locale: Non-representable transliteration still causes iconv to exit with 1 if //TRANSLIT is specified [34289] network: ns_sprintrrf uses p_class, p_type internally [34311] build: THP tests failed to link [34347] libc: Incorrect trailing bitfield word of struct tcp_info [34348] dynamic-link: FAIL: elf/tst-thp-1 if THP is disabled in kernel [34351] build: Random test failures [34355] build: [2.44 Regression] "make check -j7 subdirs=stdio-common" no longer works [34396] libc: sparc64-unknown-linux-gnu , Gentoo: >200 test failures, SIGILL in many binaries [34398] string: Truncated strncpy on s390x z900 ifunc variant Release Notes ============= https://sourceware.org/glibc/wiki/Release/2.44 Contributors ============ This release was made possible by the contributions of many people. The maintainers are grateful to everyone who has contributed changes or bug reports. These include: Adam Yi Adhemerval Zanella Alejandro Colomar Andreas K. Hüttel Andreas Schwab Arjun Shankar Aurelien Jarno Avinal Kumar Brian Jorgensen Carlos O'Donell Carlos Peón Costa Charlotte Mcmenamin Collin Funk Cosmina Dunca DJ Delorie Daan De Meyer Deng Jianbo Dev Jain Diego Nieto Cid Dmitry Kovalenko Dylan Fleming Etienne Brateau Fabian Rast Florian Weimer Frédéric Bérat Garccez George Hu H.J. Lu Jakub Jelinek Jiamei Xie Jiho Lee Jiri Stransky John David Anglin Jonathan Wakely Josef Johansson Joseph Myers Justus Winter Luca Boccassi Lucas Chollet Martin Coufal Matt Turner Michael Ford Michael Jeanson Michael Kelly Mike FABIAN Mike Kelly Muhammad Kamran Nicolas Boulenguez Paul Eggert Peter Bergner Peter Collingbourne Petr Menšík Pierre Blanchard Pino Toscano Pádraig Brady Richard Wild Rocket Ma RyotaSaito Sachin Monga Sajan Karumanchi Sam James Samuel Balazi Samuel Thibault Sana Kazi Sergey Kolosov Shamil Abdulaev Shengwen Cheng Siddhesh Poyarekar Stefan Liebler Thomas Daubney Tomasz Kamiński Uros Bizjak WANG Rui Weihong Ye Weixie Cui Wilco Dijkstra Xi Ruoyao Xiang Gao Yao Zihong Yunze Zhu Yury Khrustalev Zihong Yao mengqinggang xiejiamei zombie12138 We would like to call out the following and thank them for their tireless patch review: Adhemerval Zanella Andreas K. Hüttel Arjun Shankar Aurelien Jarno caiyinyu Carlos O'Donell Collin Funk DJ Delorie Florian Weimer Frédéric Bérat Ganesh Gopalasubramanian H.J. Lu JiangNing Mathieu Desnoyers Paul Eggert Paul Zimmermann Peter Bergner Sam James Samuel Thibault Siddhesh Poyarekar Stefan Liebler Sunil K Pandey Wilco Dijkstra Yury Khrustalev -- PD Dr. Andreas K. Hüttel [email protected] Gentoo Linux developer (council, comrel, toolchain, base-system, perl, libreoffice) https://wiki.gentoo.org/wiki/User:Dilfridge
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