Bug 2492814 (CVE-2026-53216)

Summary: CVE-2026-53216 kernel: net: mvpp2: limit XDP frame size to the RX buffer
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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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 vulnerability arises from improper handling of the eXpress Data Path (XDP) frame size, where the system advertises a larger frame size than the actual allocated buffer for short buffer pools. This can allow the bpf_xdp_adjust_tail() function to write data beyond the intended memory boundary, leading to memory corruption. Such corruption could potentially result in system instability or denial of service.
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Description OSIDB Bzimport 2026-06-25 10:07:11 UTC 
In the Linux kernel, the following vulnerability has been resolved:

net: mvpp2: limit XDP frame size to the RX buffer

mvpp2 has short and long BM pools, and short pool buffers can be smaller
than PAGE_SIZE. The XDP path nevertheless initializes every xdp_buff with
PAGE_SIZE as frame size.

XDP helpers use frame_sz to validate tail growth and to derive the hard
end of the data area. Advertising PAGE_SIZE for short buffers can let
bpf_xdp_adjust_tail() grow a packet past the real allocation, corrupting
memory or later tripping skb tailroom checks.

Initialize the XDP buffer with bm_pool->frag_size so XDP tailroom matches
the actual buffer backing the packet.
Comment 1 Keith Grant 2026-06-26 01:11:46 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026062504-CVE-2026-53216-9219@gregkh/T