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Add advisory for aeron: OOB memory access in atomic_buffer() #2866

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Add advisory for aeron: OOB memory access in atomic_buffer() #2866

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23 changes: 23 additions & 0 deletions crates/aeron/RUSTSEC-0000-0000.md
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```toml
[advisory]
id = "RUSTSEC-0000-0000"
package = "aeron"
date = "2026-05-02"
url = "https://github.com/UnitedTraders/aeron-rs/issues/31"
informational = "unsound"
categories = ["memory-corruption"]
keywords = ["out-of-bounds", "segfault"]

[versions]
patched = []
```

# Out-of-bounds memory access in `MemoryMappedFile::atomic_buffer()`

`MemoryMappedFile::atomic_buffer()` performs unchecked pointer arithmetic
without validating that the offset + length fits within the mapped file size.
Passing an offset far beyond the file size causes a segmentation fault on
subsequent buffer operations.

This can be triggered through safe public APIs — `atomic_buffer()` is a safe
method — with no `unsafe` required from the caller.