{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-71132",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-71132"
  ],
  "published": "2026-01-14T15:08:11Z",
  "summary": "smc91x: fix broken irq-context in PREEMPT_RT",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmc91x: fix broken irq-context in PREEMPT_RT\n\nWhen smc91x.c is built with PREEMPT_RT, the following splat occurs\nin FVP_RevC:\n\n[   13.055000] smc91x LNRO0003:00 eth0: link up, 10Mbps, half-duplex, lpa 0x0000\n[   13.062137] BUG: workqueue leaked atomic, lock or RCU: kworker/2:1[106]\n[   13.062137]      preempt=0x00000000 lock=0->0 RCU=0->1 workfn=mld_ifc_work\n[   13.062266] C\n** replaying previous printk message **\n[   13.062266] CPU: 2 UID: 0 PID: 106 Comm: kworker/2:1 Not tainted 6.18.0-dirty #179 PREEMPT_{RT,(full)}\n[   13.062353] Hardware name:  , BIOS\n[   13.062382] Workqueue: mld mld_ifc_work\n[   13.062469] Call trace:\n[   13.062494]  show_stack+0x24/0x40 (C)\n[   13.062602]  __dump_stack+0x28/0x48\n[   13.062710]  dump_stack_lvl+0x7c/0xb0\n[   13.062818]  dump_stack+0x18/0x34\n[   13.062926]  process_scheduled_works+0x294/0x450\n[   13.063043]  worker_thread+0x260/0x3d8\n[   13.063124]  kthread+0x1c4/0x228\n[   13.063235]  ret_from_fork+0x10/0x20\n\nThis happens because smc_special_trylock() disables IRQs even on PREEMPT_RT,\nbut smc_special_unlock() does not restore IRQs on PREEMPT_RT.\nThe reason is that smc_special_unlock() calls spin_unlock_irqrestore(),\nand rcu_read_unlock_bh() in __dev_queue_xmit() cannot invoke\nrcu_read_unlock() through __local_bh_enable_ip() when current->softirq_disable_cnt becomes zero.\n\nTo address this issue, replace smc_special_trylock() with spin_trylock_irqsave().",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.160",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-71132"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1c4cb705e733250d13243f6a69b8b5a92e39b9f6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9d222141b00156509d67d80c771fbefa92c43ace"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ef277ae121b3249c99994652210a326b52d527b0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/36561b86cb2501647662cfaf91286dd6973804a6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b6018d5c1a8f09d5efe4d6961d7ee45fdf3a7ce3"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6402078bd9d1ed46e79465e1faaa42e3458f8a33"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z"
  }
}