CVE-2026-80779: net/ionic: avoid OOB TX partner lookup for hwstamp RXQ

CVE-2026-80779: net/ionic: avoid OOB TX partner lookup for hwstamp RXQ

[Greg Kroah-Hartman]

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

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

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

net/ionic: avoid OOB TX partner lookup for hwstamp RXQ

The dedicated hardware timestamp RX queue is allocated with q->index
equal to lif->ionic->nrxqs_per_lif. The normal txqcqs array only
contains the regular queue pairs, so using that index to set rxq->partner
can read one entry past txqcqs[] and then write through the derived
pointer.
Only link RX/TX partners for normal queue-pair indexes. Leave the hwstamp
RX queue unpaired, and make the XDP_TX path abort cleanly if an RX queue
has no TX partner.

The Linux kernel CVE team has assigned CVE-2026-80779 to this issue.


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

	Issue introduced in 6.9 with commit 8eeed8373e1cca836799bf8e4a05cffa8e444908 and fixed in 6.12.106 with commit 881a805a8029ba48c0ce81c6674910f8d83f7afb
	Issue introduced in 6.9 with commit 8eeed8373e1cca836799bf8e4a05cffa8e444908 and fixed in 6.18.47 with commit 39fc615e355b65b8d43be30da57aa95ae6eaf688
	Issue introduced in 6.9 with commit 8eeed8373e1cca836799bf8e4a05cffa8e444908 and fixed in 7.1.11 with commit f3868046e8e2e761d4d943a232bd109ff22a7d5b
	Issue introduced in 6.9 with commit 8eeed8373e1cca836799bf8e4a05cffa8e444908 and fixed in 7.2.1 with commit ea081b4435515ac7177eb598a3c0678d1b9e7911
	Issue introduced in 6.9 with commit 8eeed8373e1cca836799bf8e4a05cffa8e444908 and fixed in 7.3-rc1 with commit d92255b405fb6f5acca408239ccd742e0a42c9cb

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-2026-80779
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/pensando/ionic/ionic_lif.c
	drivers/net/ethernet/pensando/ionic/ionic_txrx.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/881a805a8029ba48c0ce81c6674910f8d83f7afb
	https://git.kernel.org/stable/c/39fc615e355b65b8d43be30da57aa95ae6eaf688
	https://git.kernel.org/stable/c/f3868046e8e2e761d4d943a232bd109ff22a7d5b
	https://git.kernel.org/stable/c/ea081b4435515ac7177eb598a3c0678d1b9e7911
	https://git.kernel.org/stable/c/d92255b405fb6f5acca408239ccd742e0a42c9cb