Bug 2492804 (CVE-2026-53217)

Summary: CVE-2026-53217 kernel: net: mvpp2: sync RX data at the hardware packet offset
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's mvpp2 network driver. This issue occurs because the driver incorrectly synchronizes received (RX) data at the hardware packet offset. On systems with non-coherent Direct Memory Access (DMA), this can lead to the Central Processing Unit (CPU) reading stale cache contents instead of the actual received network frame data. This vulnerability could result in information disclosure.
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Description OSIDB Bzimport 2026-06-25 10:06:39 UTC 
In the Linux kernel, the following vulnerability has been resolved:

net: mvpp2: sync RX data at the hardware packet offset

mvpp2 programs the RX queue packet offset, so hardware writes received
data at dma_addr + MVPP2_SKB_HEADROOM. The current CPU sync starts at
dma_addr and only covers rx_bytes + MVPP2_MH_SIZE bytes, which syncs the
unused headroom and misses the same number of bytes at the packet tail.

On non-coherent DMA systems this can leave the CPU reading stale cache
contents for the end of the received frame.

Use dma_sync_single_range_for_cpu() with MVPP2_SKB_HEADROOM as the range
offset so the sync covers the Marvell header and packet data actually
written by hardware.
Comment 1 Keith Grant 2026-06-26 00:55:15 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026062504-CVE-2026-53217-ff47@gregkh/T