CVE-2025-71132

/// Technical description

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

smc91x: fix broken irq-context in PREEMPT_RT

When smc91x.c is built with PREEMPT_RT, the following splat occurs

in FVP_RevC:

[ 13.055000] smc91x LNRO0003:00 eth0: link up, 10Mbps, half-duplex, lpa 0x0000

[ 13.062137] BUG: workqueue leaked atomic, lock or RCU: kworker/2:1[106]

[ 13.062137] preempt=0x00000000 lock=0->0 RCU=0->1 workfn=mld_ifc_work

[ 13.062266] C

** replaying previous printk message **

[ 13.062266] CPU: 2 UID: 0 PID: 106 Comm: kworker/2:1 Not tainted 6.18.0-dirty #179 PREEMPT_{RT,(full)}

[ 13.062353] Hardware name: , BIOS

[ 13.062382] Workqueue: mld mld_ifc_work

[ 13.062469] Call trace:

[ 13.062494] show_stack+0x24/0x40 (C)

[ 13.062602] __dump_stack+0x28/0x48

[ 13.062710] dump_stack_lvl+0x7c/0xb0

[ 13.062818] dump_stack+0x18/0x34

[ 13.062926] process_scheduled_works+0x294/0x450

[ 13.063043] worker_thread+0x260/0x3d8

[ 13.063124] kthread+0x1c4/0x228

[ 13.0632

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References