Announcing new releases Alpha 4593.0.0, Beta 4547.1.0 and Stable 4459.2.3

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Flatcar Container Linux User

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Jan 27, 2026, 10:31:39 AM (8 days ago) Jan 27
to Flatcar Container Linux User

Hello,

We are pleased to announce a new Flatcar Container Linux release for the Alpha, Beta and Stable channel.

Alpha 4593.0.0

Changes since Alpha 4547.0.0

Security fixes:Changes:
  • Dropped Ciphers, MACs, and KexAlgorithms from the sshd configuration so that the OpenSSH upstream defaults are used. This introduces post-quantum key exchange algorithms for better security. (Flatcar#1921). Users requiring legacy Ciphers, MACs, and/or KexAlgos can override / re-enable this by deploying a custom drop-in config to /etc/ssh/sshd_config.d/.
  • Enabled netkit module (scripts#3524)
Updates:Beta 4547.1.0

Changes since Beta 4515.1.0

Security fixes:Bug fixes:
  • Dropped debug symbols from containerd, incus, and overlaybd system extensions to reduce download size.
Changes:
  • Dropped Ciphers, MACs, and KexAlgorithms from the sshd configuration so that the OpenSSH upstream defaults are used. This introduces post-quantum key exchange algorithms for better security. (Flatcar#1921). Users requiring legacy Ciphers, MACs, and/or KexAlgos can override / re-enable this by deploying a custom drop-in config to /etc/ssh/sshd_config.d/.
  • /etc/shadow, /etc/gshadow are now owned by the shadow group, /usr/bin/unix_chkpwd, /usr/bin/chage and /usr/bin/expiry are now also owned by the shadow group with a sticky bit enabled.
Updates:Stable 4459.2.3

Changes since Stable 4459.2.2

Security fixes:Updates:

Best,

The Flatcar Container Linux Maintainers

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