CVE-2026-74697: bnxt_en: Disable EOP for TPA on all chips to prevent data corruption

From: Greg Kroah-Hartman <[email protected]>

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

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

bnxt_en: Disable EOP for TPA on all chips to prevent data corruption

EOP (End of frame padding) on the AGG ring may cause overlapping of
zero padding at the end of one segment with the next segment's data.
If Relaxed Ordering (RO) is enabled, the zero padding may overwrite
valid data in the next segment and corrupt the data.  Older chips
(P5 and older) do not automatically disable RO when EOP is enabled.
On some ARM systems, data corruption was reported on 57508 (P5)
chips with RO enabled.

Always disable EOP on all chips on the AGG rings when TPA is enabled
to fix the data corruption.

The Linux kernel CVE team has assigned CVE-2026-74697 to this issue.


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

	Issue introduced in 5.4 with commit bfcd8d791ec18496772d117774398e336917f56e and fixed in 5.10.265 with commit 68c181af7cd1ca9cbf29acd95911073bfd3c6397
	Issue introduced in 5.4 with commit bfcd8d791ec18496772d117774398e336917f56e and fixed in 5.15.216 with commit 7aee22a35978b44784612c156e358e375ddf5d16
	Issue introduced in 5.4 with commit bfcd8d791ec18496772d117774398e336917f56e and fixed in 6.1.183 with commit 410da4428b1f47bf9a84bdc0bcaa089d73ba2048
	Issue introduced in 5.4 with commit bfcd8d791ec18496772d117774398e336917f56e and fixed in 6.6.152 with commit b61c4911204a0a2f900e538d64ceb608f6c9614d
	Issue introduced in 5.4 with commit bfcd8d791ec18496772d117774398e336917f56e and fixed in 6.18.45 with commit aab3b5f4d8ec8598606ee011e219ef824ae25ca0
	Issue introduced in 5.4 with commit bfcd8d791ec18496772d117774398e336917f56e and fixed in 7.1.9 with commit c1962ab4645a914a91ff492735881150ddc8a79e
	Issue introduced in 5.4 with commit bfcd8d791ec18496772d117774398e336917f56e and fixed in 7.2 with commit c3faf548a00f4c17100cc9204746975fa46a73b9

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-2026-74697
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/broadcom/bnxt/bnxt.c


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/68c181af7cd1ca9cbf29acd95911073bfd3c6397
	https://git.kernel.org/stable/c/7aee22a35978b44784612c156e358e375ddf5d16
	https://git.kernel.org/stable/c/410da4428b1f47bf9a84bdc0bcaa089d73ba2048
	https://git.kernel.org/stable/c/b61c4911204a0a2f900e538d64ceb608f6c9614d
	https://git.kernel.org/stable/c/aab3b5f4d8ec8598606ee011e219ef824ae25ca0
	https://git.kernel.org/stable/c/c1962ab4645a914a91ff492735881150ddc8a79e
	https://git.kernel.org/stable/c/c3faf548a00f4c17100cc9204746975fa46a73b9