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This is not true. Perhaps on an already at-risk or exploitable machine, but even then it's not trivial, and this is not a widespread thing that happens everywhere all the time
It is. Privilege escalation vulnerabilities are common. There is basically a 100% chance of unpatched container escapes in the Linux kernel. Some of these are very likely privately known and available for sale. So even if you are fully patched a resourceful attacker will escape the container.
That being said if you are a low-value regular-joe patching regularly, the risk is relatively low.