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_interpqueuesmodule.c: Use-after-free from dangling items.last pointer #146427

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_interpqueuesmodule.c: Use-after-free from dangling items.last pointer#146427
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extension-modulesC modules in the Modules dirC modules in the Modules dirtopic-subinterpreterstype-crashA hard crash of the interpreter, possibly with a core dumpA hard crash of the interpreter, possibly with a core dump
@aisk

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@aisk
aisk
opened on Mar 25, 2026
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Crash report

What happened?

Summary

_queue_clear_interpreter in Modules/_interpqueuesmodule.c (lines 739-774) never updates queue->items.last when removing the tail item. After the item is freed, items.last is a dangling pointer. Next queue operation writes to freed memory.

I have a working patch on this issue, will sending the PR later.

CPython versions tested on:

CPython main branch

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Output from running 'python -VV' on the command line:

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    extension-modulesC modules in the Modules dirC modules in the Modules dirtopic-subinterpreterstype-crashA hard crash of the interpreter, possibly with a core dumpA hard crash of the interpreter, possibly with a core dump

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