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Root access vulnerability in glibc library impacts many Linux distros
(securityaffairs.com)
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this post was submitted on 31 Jan 2024
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For what it's worth, glibc is very much performance-critical, so this shouldn't be a surprise. Any possible optimization is worth it.
There are a ton of free software libc implementations outside of glibc. I think most implementations of libc are free software at this point. There's Bionic, the BSD libcs, musl, the Haiku libc, the OpenSolaris/OpenIndiana libc, Newlib, relibc, the ToaruOS libc, the SerenityOS libc and a bunch more. Pretty sure Wine/ReactOS also have free implementations of the Windows libc.
Glibc has extensions that fragment compatibility. If Glibc is replaced by another libc, some apps prints an error, or don't work. I noticed that on Alpine.