CVE-2026-93278: staging: octeon: add missing napi_disable in cvm_oct_rx_shutdown

CVE-2026-93278: staging: octeon: add missing napi_disable in cvm_oct_rx_shutdown

[Greg Kroah-Hartman]

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

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

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

staging: octeon: add missing napi_disable in cvm_oct_rx_shutdown

cvm_oct_rx_shutdown calls free_irq and netif_napi_del without
disabling the napi instance first. As the free_irq only waits
for completion of hard interrupt handlers, the napi poll
function could still be active. If cvm_oct_remove proceeds to
free the plat structure (which holds the NAPI instances), the
active poll function will access freed memory, resulting in a
use-after-free crash.

The Linux kernel CVE team has assigned CVE-2026-93278 to this issue.


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

	Issue introduced in 2.6.34 with commit 3368c784bcf77124aaf39372e627016c36bd4472 and fixed in 5.15.221 with commit 158389d7af04bbf0664d91c2ce31fcc9eeace1eb
	Issue introduced in 2.6.34 with commit 3368c784bcf77124aaf39372e627016c36bd4472 and fixed in 6.1.188 with commit c124049c3a7006fd6caf629139a5722610bbffb4
	Issue introduced in 2.6.34 with commit 3368c784bcf77124aaf39372e627016c36bd4472 and fixed in 6.6.157 with commit 98f9036b2254c928cb44da0c77dba38f66f7d8f1
	Issue introduced in 2.6.34 with commit 3368c784bcf77124aaf39372e627016c36bd4472 and fixed in 6.12.110 with commit b38fbd68cc36b4f478a1e3cfc169b8616ae1337d
	Issue introduced in 2.6.34 with commit 3368c784bcf77124aaf39372e627016c36bd4472 and fixed in 6.18.52 with commit 89f9f433271fad9351de6a3c713b45b2cfb23e4a
	Issue introduced in 2.6.34 with commit 3368c784bcf77124aaf39372e627016c36bd4472 and fixed in 7.2.6 with commit b2243ffaac14cc3639b5b32a371aac37f96ee554
	Issue introduced in 2.6.34 with commit 3368c784bcf77124aaf39372e627016c36bd4472 and fixed in 7.3-rc1 with commit c0a9a8586a63fda49e61a6b83360feac2a60d898

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-2026-93278
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/staging/octeon/ethernet-rx.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/158389d7af04bbf0664d91c2ce31fcc9eeace1eb
	https://git.kernel.org/stable/c/c124049c3a7006fd6caf629139a5722610bbffb4
	https://git.kernel.org/stable/c/98f9036b2254c928cb44da0c77dba38f66f7d8f1
	https://git.kernel.org/stable/c/b38fbd68cc36b4f478a1e3cfc169b8616ae1337d
	https://git.kernel.org/stable/c/89f9f433271fad9351de6a3c713b45b2cfb23e4a
	https://git.kernel.org/stable/c/b2243ffaac14cc3639b5b32a371aac37f96ee554
	https://git.kernel.org/stable/c/c0a9a8586a63fda49e61a6b83360feac2a60d898