firmware: stratix10-rsu: Fix NULL pointer dereference when RSU is disabled

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Summary

CVECVE-2026-43410
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-08 15:16:52 UTC
Updated2026-05-08 15:16:52 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 15847537b623f844d9a08da99ff4568315e1d4f8 aa5739e0c51ad01c6e763ca89c1bfb58fc6ea71a git Not specified
CNA Linux Linux affected 15847537b623f844d9a08da99ff4568315e1d4f8 c45f7263100cece247dd3fa5fe277bd97fdb5687 git Not specified
CNA Linux Linux affected 6.19 Not specified
CNA Linux Linux unaffected 6.19 semver Not specified
CNA Linux Linux unaffected 6.19.9 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/c45f7263100cece247dd3fa5fe277bd97fdb5687 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/aa5739e0c51ad01c6e763ca89c1bfb58fc6ea71a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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