CVE-2026-43410 firmware: stratix10-rsu: Fix NULL pointer dereference when RSU is disabled
A NULL pointer dereference in the Stratix10 RSU driver causes a kernel panic when RSU is disabled in firmware, leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-43410?
CVE-2026-43410 is a medium-severity vulnerability in Linux kernel, published on 8 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-476
Which versions are affected by CVE-2026-43410?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-43410?
Apply the vendor's patch.
Is CVE-2026-43410 being exploited?
There is no known exploitation of CVE-2026-43410 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2026-43410, GHSA-q6cw-2hr2-g93j, ROOT-OS-UBUNTU-2204-CVE-2026-43410, ROOT-OS-UBUNTU-2404-CVE-2026-43410, UBUNTU-CVE-2026-43410.