APPLIED: [SRU][N][PATCH 0/1] CVE-2025-21687

[Stefan Bader]

On 08/09/2026 21:42, Cengiz Can via kernel-team wrote:
> https://ubuntu.com/security/CVE-2025-21687
> 
> [ Impact ]
> 
> In the Linux kernel, the following vulnerability has been resolved:
> 
> vfio/platform: check the bounds of read/write syscalls
> 
> count and offset are passed from user space and not checked, only offset is
> capped to 40 bits, which can be used to read/write out of bounds of the device.
> 
> [ Fix ]
> 
> noble/linux: clean cherry-pick of ce9ff21ea89d
> 
> The fix adds explicit bounds checking so that the combination of the
> user-supplied count and offset must fall within the size of the targeted
> device region before any read or write is performed.
> 
> [ Test Plan ]
> 
> Build and boot tested.
> 
> [ Where Problems Could Occur ]
> 
> This change only affects the vfio/platform driver, which is used to assign
> platform devices to userspace or virtual machines. A bad fix could reject
> legitimate read/write accesses to a device region and break users who pass
> through platform devices via VFIO, for example on ARM/embedded systems that
> rely on vfio-platform for device assignment. Systems that do not use
> vfio-platform, including the common PCI passthrough path (vfio-pci), are
> not affected.
> 
> [ Other Info ]
> 
> Kybele flow-v11-21-g0f091652. Reference: 9870e982/v1
> 

Applied to noble:linux/master-next. Thanks.

-Stefan
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