CVE-2025-71132 (GCVE-0-2025-71132)

Vulnerability from cvelistv5 – Published: 2026-01-14 15:07 – Updated: 2026-01-14 15:07
VLAI?
Title
smc91x: fix broken irq-context in PREEMPT_RT
Summary
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().
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 342a93247e0837101f27bbcca26f402902df98dc , < 9d222141b00156509d67d80c771fbefa92c43ace (git)
Affected: 342a93247e0837101f27bbcca26f402902df98dc , < ef277ae121b3249c99994652210a326b52d527b0 (git)
Affected: 342a93247e0837101f27bbcca26f402902df98dc , < 36561b86cb2501647662cfaf91286dd6973804a6 (git)
Affected: 342a93247e0837101f27bbcca26f402902df98dc , < b6018d5c1a8f09d5efe4d6961d7ee45fdf3a7ce3 (git)
Affected: 342a93247e0837101f27bbcca26f402902df98dc , < 6402078bd9d1ed46e79465e1faaa42e3458f8a33 (git)
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    Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 6.1.160 , ≤ 6.1.* (semver)
Unaffected: 6.6.120 , ≤ 6.6.* (semver)
Unaffected: 6.12.64 , ≤ 6.12.* (semver)
Unaffected: 6.18.4 , ≤ 6.18.* (semver)
Unaffected: 6.19-rc4 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/smsc/smc91x.c"
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          "vendor": "Linux",
          "versions": [
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              "status": "unaffected",
              "version": "0",
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              "status": "unaffected",
              "version": "6.12.64",
              "versionType": "semver"
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              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.4",
              "versionType": "semver"
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      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "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-\u003e0 RCU=0-\u003e1 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-\u003esoftirq_disable_cnt becomes zero.\n\nTo address this issue, replace smc_special_trylock() with spin_trylock_irqsave()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-14T15:07:47.860Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/9d222141b00156509d67d80c771fbefa92c43ace"
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        },
        {
          "url": "https://git.kernel.org/stable/c/6402078bd9d1ed46e79465e1faaa42e3458f8a33"
        }
      ],
      "title": "smc91x: fix broken irq-context in PREEMPT_RT",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-71132",
    "datePublished": "2026-01-14T15:07:47.860Z",
    "dateReserved": "2026-01-13T15:30:19.655Z",
    "dateUpdated": "2026-01-14T15:07:47.860Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-71132\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-01-14T15:16:02.947\",\"lastModified\":\"2026-01-14T16:25:12.057\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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-\u003e0 RCU=0-\u003e1 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-\u003esoftirq_disable_cnt becomes zero.\\n\\nTo address this issue, replace smc_special_trylock() with spin_trylock_irqsave().\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/36561b86cb2501647662cfaf91286dd6973804a6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6402078bd9d1ed46e79465e1faaa42e3458f8a33\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9d222141b00156509d67d80c771fbefa92c43ace\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b6018d5c1a8f09d5efe4d6961d7ee45fdf3a7ce3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ef277ae121b3249c99994652210a326b52d527b0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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