CVE-2026-72064: net: mana: Sync page pool RX frags for CPU

CVE-2026-72064: net: mana: Sync page pool RX frags for CPU

[Greg Kroah-Hartman]

From: Greg Kroah-Hartman <gregkh@kernel.org>

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

net: mana: Sync page pool RX frags for CPU

MANA allocates RX buffers from page pool fragments when frag_count is
greater than 1. In that case the buffers remain DMA mapped by page pool
and the RX completion path does not call dma_unmap_single(). As a result,
the implicit sync-for-CPU normally performed by dma_unmap_single() is
missing before the packet data is passed to the networking stack.

This breaks RX on configurations which require explicit DMA syncing, for
example when booted with swiotlb=force.

Fix this by recording the page pool page and DMA sync offset when the RX
buffer is allocated, and syncing the received packet range for CPU access
before handing the RX buffer to the stack.

The Linux kernel CVE team has assigned CVE-2026-72064 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 6.18 with commit 730ff06d3f5cc2ce0348414b78c10528b767d4a3 and fixed in 7.1.5 with commit bc650dd5ce6434286b96e2b26a41af81f679cc7c
	Issue introduced in 6.18 with commit 730ff06d3f5cc2ce0348414b78c10528b767d4a3 and fixed in 7.2-rc3 with commit c72a0f09c57f92113df69f9b902d11c9e4b132f5

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2026-72064
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	drivers/net/ethernet/microsoft/mana/mana_en.c
	include/net/mana/mana.h


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/bc650dd5ce6434286b96e2b26a41af81f679cc7c
	https://git.kernel.org/stable/c/c72a0f09c57f92113df69f9b902d11c9e4b132f5