Bug 2395774 (CVE-2025-39822)

Summary: CVE-2025-39822 kernel: io_uring/kbuf: fix signedness in this_len calculation
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-09-16 14:01:33 UTC 
In the Linux kernel, the following vulnerability has been resolved:

io_uring/kbuf: fix signedness in this_len calculation

When importing and using buffers, buf->len is considered unsigned.
However, buf->len is converted to signed int when committing. This can
lead to unexpected behavior if the buffer is large enough to be
interpreted as a negative value. Make min_t calculation unsigned.
Comment 1 Keith Grant 2025-09-16 16:17:09 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025091616-CVE-2025-39822-454e@gregkh/T