Bug 2388946 (CVE-2025-38533)

Summary: CVE-2025-38533 kernel: net: libwx: fix the using of Rx buffer DMA
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 2025-08-16 12:03:03 UTC 
In the Linux kernel, the following vulnerability has been resolved:

net: libwx: fix the using of Rx buffer DMA

The wx_rx_buffer structure contained two DMA address fields: 'dma' and
'page_dma'. However, only 'page_dma' was actually initialized and used
to program the Rx descriptor. But 'dma' was uninitialized and used in
some paths.

This could lead to undefined behavior, including DMA errors or
use-after-free, if the uninitialized 'dma' was used. Althrough such
error has not yet occurred, it is worth fixing in the code.
Comment 1 Vipul Nair 2025-08-18 05:12:59 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025081656-CVE-2025-38533-6002@gregkh/T