Bug 2422811 (CVE-2025-68321)

Summary: CVE-2025-68321 kernel: Linux kernel: Denial of Service due to page allocation failures
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: low    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel. When driver authors fail to include the `GFP_NOWARN` flag for ATOMIC page allocations within the datapath, it can lead to issues. This omission may cause network receive operations to experience page allocation failures during out-of-memory (OOM) conditions. The primary consequence is a Denial of Service (DoS) for the affected system.
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Description OSIDB Bzimport 2025-12-16 16:03:18 UTC 
In the Linux kernel, the following vulnerability has been resolved:

page_pool: always add GFP_NOWARN for ATOMIC allocations

Driver authors often forget to add GFP_NOWARN for page allocation
from the datapath. This is annoying to users as OOMs are a fact
of life, and we pretty much expect network Rx to hit page allocation
failures during OOM. Make page pool add GFP_NOWARN for ATOMIC allocations
by default.
Comment 1 Alexander B 2025-12-16 19:02:01 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025121622-CVE-2025-68321-72b0@gregkh/T