From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-cve-announce@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@kernel.org>
Subject: CVE-2026-43410: firmware: stratix10-rsu: Fix NULL pointer dereference when RSU is disabled
Date: Fri, 8 May 2026 16:22:19 +0200 [thread overview]
Message-ID: <2026050843-CVE-2026-43410-82d1@gregkh> (raw)
From: Greg Kroah-Hartman <gregkh@kernel.org>
Description
===========
In the Linux kernel, the following vulnerability has been resolved:
firmware: stratix10-rsu: Fix NULL pointer dereference when RSU is disabled
When the Remote System Update (RSU) isn't enabled in the First Stage
Boot Loader (FSBL), the driver encounters a NULL pointer dereference when
excute svc_normal_to_secure_thread() thread, resulting in a kernel panic:
Unable to handle kernel NULL pointer dereference at virtual address 0000000000000008
Mem abort info:
...
Data abort info:
...
[0000000000000008] user address but active_mm is swapper
Internal error: Oops: 0000000096000004 [#1] SMP
Modules linked in:
CPU: 0 UID: 0 PID: 79 Comm: svc_smc_hvc_thr Not tainted 6.19.0-rc8-yocto-standard+ #59 PREEMPT
Hardware name: SoCFPGA Stratix 10 SoCDK (DT)
pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : svc_normal_to_secure_thread+0x38c/0x990
lr : svc_normal_to_secure_thread+0x144/0x990
...
Call trace:
svc_normal_to_secure_thread+0x38c/0x990 (P)
kthread+0x150/0x210
ret_from_fork+0x10/0x20
Code: 97cfc113 f9400260 aa1403e1 f9400400 (f9400402)
---[ end trace 0000000000000000 ]---
The issue occurs because rsu_send_async_msg() fails when RSU is not enabled
in firmware, causing the channel to be freed via stratix10_svc_free_channel().
However, the probe function continues execution and registers
svc_normal_to_secure_thread(), which subsequently attempts to access the
already-freed channel, triggering the NULL pointer dereference.
Fix this by properly cleaning up the async client and returning early on
failure, preventing the thread from being used with an invalid channel.
The Linux kernel CVE team has assigned CVE-2026-43410 to this issue.
Affected and fixed versions
===========================
Issue introduced in 6.19 with commit 15847537b623f844d9a08da99ff4568315e1d4f8 and fixed in 6.19.9 with commit aa5739e0c51ad01c6e763ca89c1bfb58fc6ea71a
Issue introduced in 6.19 with commit 15847537b623f844d9a08da99ff4568315e1d4f8 and fixed in 7.0 with commit c45f7263100cece247dd3fa5fe277bd97fdb5687
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-2026-43410
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/firmware/stratix10-rsu.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/aa5739e0c51ad01c6e763ca89c1bfb58fc6ea71a
https://git.kernel.org/stable/c/c45f7263100cece247dd3fa5fe277bd97fdb5687
reply other threads:[~2026-05-08 14:24 UTC|newest]
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