Bug 2348639 (CVE-2024-58000)

Summary: CVE-2024-58000 kernel: io_uring: prevent reg-wait speculations
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, rhel-process-autobot, vkumar, watson-tool-maintainers
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OS: Linux   
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Description OSIDB Bzimport 2025-02-27 03:06:04 UTC 
In the Linux kernel, the following vulnerability has been resolved:

io_uring: prevent reg-wait speculations

With *ENTER_EXT_ARG_REG instead of passing a user pointer with arguments
for the waiting loop the user can specify an offset into a pre-mapped
region of memory, in which case the
[offset, offset + sizeof(io_uring_reg_wait)) will be intepreted as the
argument.

As we address a kernel array using a user given index, it'd be a subject
to speculation type of exploits. Use array_index_nospec() to prevent
that. Make sure to pass not the full region size but truncate by the
maximum offset allowed considering the structure size.
Comment 1 Michal Findra 2025-02-27 20:48:50 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022642-CVE-2024-58000-4f74@gregkh/T