Bug 2422837 (CVE-2025-68294)

Summary: CVE-2025-68294 kernel: Linux kernel: Denial of Service in io_uring/net due to incorrect buffer handling
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in the Linux kernel's io_uring/net component. This vulnerability arises from an incorrect handling of vectored buffer node imports, where the system uses an improper object for managing buffer lifetimes. A local attacker could exploit this to cause a Denial of Service (DoS), making the system unavailable.
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Description OSIDB Bzimport 2025-12-16 16:05:27 UTC 
In the Linux kernel, the following vulnerability has been resolved:

io_uring/net: ensure vectored buffer node import is tied to notification

When support for vectored registered buffers was added, the import
itself is using 'req' rather than the notification io_kiocb, sr->notif.
For non-vectored imports, sr->notif is correctly used. This is important
as the lifetime of the two may be different. Use the correct io_kiocb
for the vectored buffer import.
Comment 1 Alexander B 2025-12-16 17:27:02 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025121641-CVE-2025-68294-fcd2@gregkh/T