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OpenSSH: race condition in sshd allows remote code execution
(stackdiary.com)
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this post was submitted on 01 Jul 2024
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It sounds like it's the kernel but whether it has anything to do with ssh, I really don't know. Sometimes parts work together in surprising ways, as I learned with the recent sshd/systemd/xz exploit.
You might be fine and this was the most alarming exploit since it's very inconvenient, but personally I'd restart just to be sure.