CVE-2026-72045: octeontx2-af: cn10k: restrict VF LMTLINE sharing to its own PF

CVE-2026-72045: octeontx2-af: cn10k: restrict VF LMTLINE sharing to its own PF

[Greg Kroah-Hartman]

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

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

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

octeontx2-af: cn10k: restrict VF LMTLINE sharing to its own PF

rvu_mbox_handler_lmtst_tbl_setup() uses req->base_pcifunc as a direct
index into the LMT map table to read another function's LMTLINE
physical base address and copy it into the caller's own LMT map table
entry. The mailbox dispatcher authenticates req->hdr.pcifunc from the
IRQ source, but req->base_pcifunc is a separate payload field and is
not sanitized.

Reject the request with -EPERM when a VF caller's base_pcifunc is not a
valid function under its own PF. is_pf_func_valid() bounds the FUNC field
to the PF's configured VF count, keeping the computed index inside the
caller's own slot block.

The Linux kernel CVE team has assigned CVE-2026-72045 to this issue.


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

	Issue introduced in 5.14 with commit 893ae97214c385be02f8ec097298cc48c7f0d905 and fixed in 6.6.148 with commit e9c5b03208507dd6d58b0c23a2c60b5c2f4c1b11
	Issue introduced in 5.14 with commit 893ae97214c385be02f8ec097298cc48c7f0d905 and fixed in 6.12.101 with commit 54535692bec9ef464adc714108eb19e49e38b5a2
	Issue introduced in 5.14 with commit 893ae97214c385be02f8ec097298cc48c7f0d905 and fixed in 6.18.42 with commit c73b8795b45f4ad5a95120d2e9b435ea4616e08e
	Issue introduced in 5.14 with commit 893ae97214c385be02f8ec097298cc48c7f0d905 and fixed in 7.1.5 with commit 59da37fee81a8d76079313348ca13c5bc90dd6ae
	Issue introduced in 5.14 with commit 893ae97214c385be02f8ec097298cc48c7f0d905 and fixed in 7.2-rc1 with commit 8cdcf3d2caacdee7ddd363705fb4d93b0c1a0915

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-2026-72045
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/marvell/octeontx2/af/rvu_cn10k.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/e9c5b03208507dd6d58b0c23a2c60b5c2f4c1b11
	https://git.kernel.org/stable/c/54535692bec9ef464adc714108eb19e49e38b5a2
	https://git.kernel.org/stable/c/c73b8795b45f4ad5a95120d2e9b435ea4616e08e
	https://git.kernel.org/stable/c/59da37fee81a8d76079313348ca13c5bc90dd6ae
	https://git.kernel.org/stable/c/8cdcf3d2caacdee7ddd363705fb4d93b0c1a0915