CVE-2026-72060: net: ethernet: ti: icssg: guard PA stat lookups

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

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

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

net: ethernet: ti: icssg: guard PA stat lookups

icssg_ndo_get_stats64() unconditionally calls emac_get_stat_by_name()
with FW PA stat names regardless of whether the PA stats block is
present on the hardware.  emac_get_stat_by_name() already guards the
PA stats lookup with `if (emac->prueth->pa_stats)`; when that pointer
is NULL the lookup falls through to netdev_err() and returns -EINVAL.
Because ndo_get_stats64 is polled regularly by the networking stack
this produces thousands of log entries of the form:

  icssg-prueth icssg1-eth end0: Invalid stats FW_RX_ERROR

A secondary consequence is that the int(-EINVAL) return value is
implicitly widened to a near-ULLONG_MAX unsigned value when accumulated
into the __u64 fields of rtnl_link_stats64, silently corrupting the
rx_errors, rx_dropped and tx_dropped counters reported by `ip -s link`.

Every other PA-aware code path in the driver is already guarded with
the same `if (emac->prueth->pa_stats)` check.  Apply the same guard
here.

The Linux kernel CVE team has assigned CVE-2026-72060 to this issue.


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

	Issue introduced in 6.16 with commit 0d15a26b247d25cd012134bf8825128fedb15cc9 and fixed in 6.18.40 with commit 121c5f31c3fb70d4a23e8a084f5cb8b3ec63be8d
	Issue introduced in 6.16 with commit 0d15a26b247d25cd012134bf8825128fedb15cc9 and fixed in 7.1.5 with commit b3763f7e22ecaa7ad79bf44bf41816d488edbcf8
	Issue introduced in 6.16 with commit 0d15a26b247d25cd012134bf8825128fedb15cc9 and fixed in 7.2-rc1 with commit 27b9daba50609335db6ca81e4cccf50ded21ec76

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-2026-72060
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/ti/icssg/icssg_common.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/121c5f31c3fb70d4a23e8a084f5cb8b3ec63be8d
	https://git.kernel.org/stable/c/b3763f7e22ecaa7ad79bf44bf41816d488edbcf8
	https://git.kernel.org/stable/c/27b9daba50609335db6ca81e4cccf50ded21ec76