Bug 2448689 (CVE-2026-23259)

Summary: CVE-2026-23259 kernel: io_uring/rw: free potentially allocated iovec on cache put failure
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 2026-03-18 18:02:31 UTC 
In the Linux kernel, the following vulnerability has been resolved:

io_uring/rw: free potentially allocated iovec on cache put failure

If a read/write request goes through io_req_rw_cleanup() and has an
allocated iovec attached and fails to put to the rw_cache, then it may
end up with an unaccounted iovec pointer. Have io_rw_recycle() return
whether it recycled the request or not, and use that to gauge whether to
free a potential iovec or not.
Comment 1 Jon Moroney 2026-03-18 19:52:26 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026031819-CVE-2026-23259-5bd7@gregkh/T