CVE-2025-71132

MEDIUM EPSS 1.8%
Published Jan 14, 20265mo ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Jan 14, 2026 5mo ago
Last Modified Jun 17, 2026 1w ago

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 [ 13.063235] ret_from_fork+0x10/0x20 This happens because smc_special_trylock() disables IRQs even on PREEMPT_RT, but smc_special_unlock() does not restore IRQs on PREEMPT_RT. The reason is that smc_special_unlock() calls spin_unlock_irqrestore(), and rcu_read_unlock_bh() in __dev_queue_xmit() cannot invoke rcu_read_unlock() through __local_bh_enable_ip() when current->softirq_disable_cnt becomes zero. To address this issue, replace smc_special_trylock() with spin_trylock_irqsave().

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
1.8% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 14

VendorProductVersionRange
linuxlinux_kernel*≥5.15.1  –  <5.15.198
linuxlinux_kernel*≥5.16  –  <6.1.160
linuxlinux_kernel*≥6.2  –  <6.6.120
linuxlinux_kernel*≥6.7  –  <6.12.64
linuxlinux_kernel*≥6.13  –  <6.18.4
linuxlinux_kernel5.15any
linuxlinux_kernel6.19any
linuxlinux_kernel6.19any
linuxlinux_kernel6.19any
linuxlinux_kernel6.19any
linuxlinux_kernel6.19any
linuxlinux_kernel6.19any
linuxlinux_kernel6.19any
linuxlinux_kernel6.19any

References 6

  • git.kernel.org https://git.kernel.org/stable/c/1c4cb705e733250d13243f6a69b8b5a92e39b9f6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/36561b86cb2501647662cfaf91286dd6973804a6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6402078bd9d1ed46e79465e1faaa42e3458f8a33
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9d222141b00156509d67d80c771fbefa92c43ace
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b6018d5c1a8f09d5efe4d6961d7ee45fdf3a7ce3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ef277ae121b3249c99994652210a326b52d527b0
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/1c4cb705e733250d13243f6a69b8b5a92e39b9f6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/36561b86cb2501647662cfaf91286dd6973804a6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6402078bd9d1ed46e79465e1faaa42e3458f8a33
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9d222141b00156509d67d80c771fbefa92c43ace
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b6018d5c1a8f09d5efe4d6961d7ee45fdf3a7ce3
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/ef277ae121b3249c99994652210a326b52d527b0
    Patch