CVE-2026-45904 (GCVE-0-2026-45904)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:17 – Updated: 2026-05-27 12:17
VLAI
Title
powerpc/eeh: fix recursive pci_lock_rescan_remove locking in EEH event handling
Summary
In the Linux kernel, the following vulnerability has been resolved: powerpc/eeh: fix recursive pci_lock_rescan_remove locking in EEH event handling The recent commit 1010b4c012b0 ("powerpc/eeh: Make EEH driver device hotplug safe") restructured the EEH driver to improve synchronization with the PCI hotplug layer. However, it inadvertently moved pci_lock_rescan_remove() outside its intended scope in eeh_handle_normal_event(), leading to broken PCI error reporting and improper EEH event triggering. Specifically, eeh_handle_normal_event() acquired pci_lock_rescan_remove() before calling eeh_pe_bus_get(), but eeh_pe_bus_get() itself attempts to acquire the same lock internally, causing nested locking and disrupting normal EEH event handling paths. This patch adds a boolean parameter do_lock to _eeh_pe_bus_get(), with two public wrappers: eeh_pe_bus_get() with locking enabled. eeh_pe_bus_get_nolock() that skips locking. Callers that already hold pci_lock_rescan_remove() now use eeh_pe_bus_get_nolock() to avoid recursive lock acquisition. Additionally, pci_lock_rescan_remove() calls are restored to the correct position—after eeh_pe_bus_get() and immediately before iterating affected PEs and devices. This ensures EEH-triggered PCI removes occur under proper bus rescan locking without recursive lock contention. The eeh_pe_loc_get() function has been split into two functions: eeh_pe_loc_get(struct eeh_pe *pe) which retrieves the loc for given PE. eeh_pe_loc_get_bus(struct pci_bus *bus) which retrieves the location code for given bus. This resolves lockdep warnings such as: <snip> [ 84.964298] [ T928] ============================================ [ 84.964304] [ T928] WARNING: possible recursive locking detected [ 84.964311] [ T928] 6.18.0-rc3 #51 Not tainted [ 84.964315] [ T928] -------------------------------------------- [ 84.964320] [ T928] eehd/928 is trying to acquire lock: [ 84.964324] [ T928] c000000003b29d58 (pci_rescan_remove_lock){+.+.}-{3:3}, at: pci_lock_rescan_remove+0x28/0x40 [ 84.964342] [ T928] but task is already holding lock: [ 84.964347] [ T928] c000000003b29d58 (pci_rescan_remove_lock){+.+.}-{3:3}, at: pci_lock_rescan_remove+0x28/0x40 [ 84.964357] [ T928] other info that might help us debug this: [ 84.964363] [ T928] Possible unsafe locking scenario: [ 84.964367] [ T928] CPU0 [ 84.964370] [ T928] ---- [ 84.964373] [ T928] lock(pci_rescan_remove_lock); [ 84.964378] [ T928] lock(pci_rescan_remove_lock); [ 84.964383] [ T928] *** DEADLOCK *** [ 84.964388] [ T928] May be due to missing lock nesting notation [ 84.964393] [ T928] 1 lock held by eehd/928: [ 84.964397] [ T928] #0: c000000003b29d58 (pci_rescan_remove_lock){+.+.}-{3:3}, at: pci_lock_rescan_remove+0x28/0x40 [ 84.964408] [ T928] stack backtrace: [ 84.964414] [ T928] CPU: 2 UID: 0 PID: 928 Comm: eehd Not tainted 6.18.0-rc3 #51 VOLUNTARY [ 84.964417] [ T928] Hardware name: IBM,9080-HEX POWER10 (architected) 0x800200 0xf000006 of:IBM,FW1060.00 (NH1060_022) hv:phyp pSeries [ 84.964419] [ T928] Call Trace: [ 84.964420] [ T928] [c0000011a7157990] [c000000001705de4] dump_stack_lvl+0xc8/0x130 (unreliable) [ 84.964424] [ T928] [c0000011a71579d0] [c0000000002f66e0] print_deadlock_bug+0x430/0x440 [ 84.964428] [ T928] [c0000011a7157a70] [c0000000002fd0c0] __lock_acquire+0x1530/0x2d80 [ 84.964431] [ T928] [c0000011a7157ba0] [c0000000002fea54] lock_acquire+0x144/0x410 [ 84.964433] [ T928] [c0000011a7157cb0] [c0000011a7157cb0] __mutex_lock+0xf4/0x1050 [ 84.964436] [ T928] [c0000011a7157e00] [c000000000de21d8] pci_lock_rescan_remove+0x28/0x40 [ 84.964439] [ T928] [c0000011a7157e20] [c00000000004ed98] eeh_pe_bus_get+0x48/0xc0 [ 84.964442] [ T928] [c0000011a7157e50] [c00000 ---truncated---
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 502f08831a9afb72dc98a56ae6504da43e93b250 , < 89810e2d80281d42f855fac813786758ee16e323 (git)
Affected: f56e004b781719d8fdf6c9619b15caf2579bc1f2 , < 788dd28fd49610d6047cbb15dbf1186afffdfbaf (git)
Affected: 59c6d3d81d42bf543c90597b4f38c53d6874c5a1 , < f49faa4a64f8ac0e38983e606075b25dfcfc9ad4 (git)
Affected: a426e8a6ae161f51888585b065db0f8f93ab2e16 , < 87a1f93986aa1500b85aeff16b0b71c29ea116ea (git)
Affected: d2c60a8a387e9fcc28447ef36c03f8e49fd052a6 , < f8b16d5764ee1e78c1ef333017ad383ffe76fcdc (git)
Affected: 1010b4c012b0d78dfb9d3132b49aa2ef024a07a7 , < 6e6561231c6cfc32c5631aeecc0928ff2b14265c (git)
Affected: 1010b4c012b0d78dfb9d3132b49aa2ef024a07a7 , < b85ee287bfe52c6b2d9b41758b5e0d08679d5b39 (git)
Affected: 1010b4c012b0d78dfb9d3132b49aa2ef024a07a7 , < 815a8d2feb5615ae7f0b5befd206af0b0160614c (git)
Affected: d42bbd8f30ac38b1ce54715bf08ec3dac18d6b25 (git)
Affected: 19d5036e7ad766cf212aebec23b9f1d7924a62bc (git)
Affected: 5.10.241 , < 5.10.252 (semver)
Affected: 5.15.190 , < 5.15.202 (semver)
Affected: 6.1.148 , < 6.1.165 (semver)
Affected: 6.6.102 , < 6.6.128 (semver)
Affected: 6.12.42 , < 6.12.75 (semver)
Affected: 6.15.10 , < 6.16 (semver)
Affected: 6.16.1 , < 6.17 (semver)
Create a notification for this product.
Linux Linux Affected: 6.17
Unaffected: 0 , < 6.17 (semver)
Unaffected: 5.10.252 , ≤ 5.10.* (semver)
Unaffected: 5.15.202 , ≤ 5.15.* (semver)
Unaffected: 6.1.165 , ≤ 6.1.* (semver)
Unaffected: 6.6.128 , ≤ 6.6.* (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.14 , ≤ 6.18.* (semver)
Unaffected: 6.19.4 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/eeh: fix recursive pci_lock_rescan_remove locking in EEH event handling\n\nThe recent commit 1010b4c012b0 (\"powerpc/eeh: Make EEH driver device\nhotplug safe\") restructured the EEH driver to improve synchronization\nwith the PCI hotplug layer.\n\nHowever, it inadvertently moved pci_lock_rescan_remove() outside its\nintended scope in eeh_handle_normal_event(), leading to broken PCI\nerror reporting and improper EEH event triggering. Specifically,\neeh_handle_normal_event() acquired pci_lock_rescan_remove() before\ncalling eeh_pe_bus_get(), but eeh_pe_bus_get() itself attempts to\nacquire the same lock internally, causing nested locking and disrupting\nnormal EEH event handling paths.\n\nThis patch adds a boolean parameter do_lock to _eeh_pe_bus_get(),\nwith two public wrappers:\n    eeh_pe_bus_get() with locking enabled.\n    eeh_pe_bus_get_nolock() that skips locking.\n\nCallers that already hold pci_lock_rescan_remove() now use\neeh_pe_bus_get_nolock() to avoid recursive lock acquisition.\n\nAdditionally, pci_lock_rescan_remove() calls are restored to the correct\nposition\u2014after eeh_pe_bus_get() and immediately before iterating affected\nPEs and devices. This ensures EEH-triggered PCI removes occur under proper\nbus rescan locking without recursive lock contention.\n\nThe eeh_pe_loc_get() function has been split into two functions:\n    eeh_pe_loc_get(struct eeh_pe *pe) which retrieves the loc for given PE.\n    eeh_pe_loc_get_bus(struct pci_bus *bus) which retrieves the location\n    code for given bus.\n\nThis resolves lockdep warnings such as:\n\u003csnip\u003e\n[   84.964298] [    T928] ============================================\n[   84.964304] [    T928] WARNING: possible recursive locking detected\n[   84.964311] [    T928] 6.18.0-rc3 #51 Not tainted\n[   84.964315] [    T928] --------------------------------------------\n[   84.964320] [    T928] eehd/928 is trying to acquire lock:\n[   84.964324] [    T928] c000000003b29d58 (pci_rescan_remove_lock){+.+.}-{3:3}, at: pci_lock_rescan_remove+0x28/0x40\n[   84.964342] [    T928]\n                       but task is already holding lock:\n[   84.964347] [    T928] c000000003b29d58 (pci_rescan_remove_lock){+.+.}-{3:3}, at: pci_lock_rescan_remove+0x28/0x40\n[   84.964357] [    T928]\n                       other info that might help us debug this:\n[   84.964363] [    T928]  Possible unsafe locking scenario:\n\n[   84.964367] [    T928]        CPU0\n[   84.964370] [    T928]        ----\n[   84.964373] [    T928]   lock(pci_rescan_remove_lock);\n[   84.964378] [    T928]   lock(pci_rescan_remove_lock);\n[   84.964383] [    T928]\n                       *** DEADLOCK ***\n\n[   84.964388] [    T928]  May be due to missing lock nesting notation\n\n[   84.964393] [    T928] 1 lock held by eehd/928:\n[   84.964397] [    T928]  #0: c000000003b29d58 (pci_rescan_remove_lock){+.+.}-{3:3}, at: pci_lock_rescan_remove+0x28/0x40\n[   84.964408] [    T928]\n                       stack backtrace:\n[   84.964414] [    T928] CPU: 2 UID: 0 PID: 928 Comm: eehd Not tainted 6.18.0-rc3 #51 VOLUNTARY\n[   84.964417] [    T928] Hardware name: IBM,9080-HEX POWER10 (architected) 0x800200 0xf000006 of:IBM,FW1060.00 (NH1060_022) hv:phyp pSeries\n[   84.964419] [    T928] Call Trace:\n[   84.964420] [    T928] [c0000011a7157990] [c000000001705de4] dump_stack_lvl+0xc8/0x130 (unreliable)\n[   84.964424] [    T928] [c0000011a71579d0] [c0000000002f66e0] print_deadlock_bug+0x430/0x440\n[   84.964428] [    T928] [c0000011a7157a70] [c0000000002fd0c0] __lock_acquire+0x1530/0x2d80\n[   84.964431] [    T928] [c0000011a7157ba0] [c0000000002fea54] lock_acquire+0x144/0x410\n[   84.964433] [    T928] [c0000011a7157cb0] [c0000011a7157cb0] __mutex_lock+0xf4/0x1050\n[   84.964436] [    T928] [c0000011a7157e00] [c000000000de21d8] pci_lock_rescan_remove+0x28/0x40\n[   84.964439] [    T928] [c0000011a7157e20] [c00000000004ed98] eeh_pe_bus_get+0x48/0xc0\n[   84.964442] [    T928] [c0000011a7157e50] [c00000\n---truncated---"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-27T12:17:12.504Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/89810e2d80281d42f855fac813786758ee16e323"
        },
        {
          "url": "https://git.kernel.org/stable/c/788dd28fd49610d6047cbb15dbf1186afffdfbaf"
        },
        {
          "url": "https://git.kernel.org/stable/c/f49faa4a64f8ac0e38983e606075b25dfcfc9ad4"
        },
        {
          "url": "https://git.kernel.org/stable/c/87a1f93986aa1500b85aeff16b0b71c29ea116ea"
        },
        {
          "url": "https://git.kernel.org/stable/c/f8b16d5764ee1e78c1ef333017ad383ffe76fcdc"
        },
        {
          "url": "https://git.kernel.org/stable/c/6e6561231c6cfc32c5631aeecc0928ff2b14265c"
        },
        {
          "url": "https://git.kernel.org/stable/c/b85ee287bfe52c6b2d9b41758b5e0d08679d5b39"
        },
        {
          "url": "https://git.kernel.org/stable/c/815a8d2feb5615ae7f0b5befd206af0b0160614c"
        }
      ],
      "title": "powerpc/eeh: fix recursive pci_lock_rescan_remove locking in EEH event handling",
      "x_generator": {
        "engine": "bippy-1.2.0"
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-45904",
    "datePublished": "2026-05-27T12:17:12.504Z",
    "dateReserved": "2026-05-13T15:03:33.084Z",
    "dateUpdated": "2026-05-27T12:17:12.504Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-45904",
      "date": "2026-06-05",
      "epss": "0.00032",
      "percentile": "0.09774"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-45904\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-27T14:17:04.820\",\"lastModified\":\"2026-05-27T14:48:31.480\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\npowerpc/eeh: fix recursive pci_lock_rescan_remove locking in EEH event handling\\n\\nThe recent commit 1010b4c012b0 (\\\"powerpc/eeh: Make EEH driver device\\nhotplug safe\\\") restructured the EEH driver to improve synchronization\\nwith the PCI hotplug layer.\\n\\nHowever, it inadvertently moved pci_lock_rescan_remove() outside its\\nintended scope in eeh_handle_normal_event(), leading to broken PCI\\nerror reporting and improper EEH event triggering. Specifically,\\neeh_handle_normal_event() acquired pci_lock_rescan_remove() before\\ncalling eeh_pe_bus_get(), but eeh_pe_bus_get() itself attempts to\\nacquire the same lock internally, causing nested locking and disrupting\\nnormal EEH event handling paths.\\n\\nThis patch adds a boolean parameter do_lock to _eeh_pe_bus_get(),\\nwith two public wrappers:\\n    eeh_pe_bus_get() with locking enabled.\\n    eeh_pe_bus_get_nolock() that skips locking.\\n\\nCallers that already hold pci_lock_rescan_remove() now use\\neeh_pe_bus_get_nolock() to avoid recursive lock acquisition.\\n\\nAdditionally, pci_lock_rescan_remove() calls are restored to the correct\\nposition\u2014after eeh_pe_bus_get() and immediately before iterating affected\\nPEs and devices. This ensures EEH-triggered PCI removes occur under proper\\nbus rescan locking without recursive lock contention.\\n\\nThe eeh_pe_loc_get() function has been split into two functions:\\n    eeh_pe_loc_get(struct eeh_pe *pe) which retrieves the loc for given PE.\\n    eeh_pe_loc_get_bus(struct pci_bus *bus) which retrieves the location\\n    code for given bus.\\n\\nThis resolves lockdep warnings such as:\\n\u003csnip\u003e\\n[   84.964298] [    T928] ============================================\\n[   84.964304] [    T928] WARNING: possible recursive locking detected\\n[   84.964311] [    T928] 6.18.0-rc3 #51 Not tainted\\n[   84.964315] [    T928] --------------------------------------------\\n[   84.964320] [    T928] eehd/928 is trying to acquire lock:\\n[   84.964324] [    T928] c000000003b29d58 (pci_rescan_remove_lock){+.+.}-{3:3}, at: pci_lock_rescan_remove+0x28/0x40\\n[   84.964342] [    T928]\\n                       but task is already holding lock:\\n[   84.964347] [    T928] c000000003b29d58 (pci_rescan_remove_lock){+.+.}-{3:3}, at: pci_lock_rescan_remove+0x28/0x40\\n[   84.964357] [    T928]\\n                       other info that might help us debug this:\\n[   84.964363] [    T928]  Possible unsafe locking scenario:\\n\\n[   84.964367] [    T928]        CPU0\\n[   84.964370] [    T928]        ----\\n[   84.964373] [    T928]   lock(pci_rescan_remove_lock);\\n[   84.964378] [    T928]   lock(pci_rescan_remove_lock);\\n[   84.964383] [    T928]\\n                       *** DEADLOCK ***\\n\\n[   84.964388] [    T928]  May be due to missing lock nesting notation\\n\\n[   84.964393] [    T928] 1 lock held by eehd/928:\\n[   84.964397] [    T928]  #0: c000000003b29d58 (pci_rescan_remove_lock){+.+.}-{3:3}, at: pci_lock_rescan_remove+0x28/0x40\\n[   84.964408] [    T928]\\n                       stack backtrace:\\n[   84.964414] [    T928] CPU: 2 UID: 0 PID: 928 Comm: eehd Not tainted 6.18.0-rc3 #51 VOLUNTARY\\n[   84.964417] [    T928] Hardware name: IBM,9080-HEX POWER10 (architected) 0x800200 0xf000006 of:IBM,FW1060.00 (NH1060_022) hv:phyp pSeries\\n[   84.964419] [    T928] Call Trace:\\n[   84.964420] [    T928] [c0000011a7157990] [c000000001705de4] dump_stack_lvl+0xc8/0x130 (unreliable)\\n[   84.964424] [    T928] [c0000011a71579d0] [c0000000002f66e0] print_deadlock_bug+0x430/0x440\\n[   84.964428] [    T928] [c0000011a7157a70] [c0000000002fd0c0] __lock_acquire+0x1530/0x2d80\\n[   84.964431] [    T928] [c0000011a7157ba0] [c0000000002fea54] lock_acquire+0x144/0x410\\n[   84.964433] [    T928] [c0000011a7157cb0] [c0000011a7157cb0] __mutex_lock+0xf4/0x1050\\n[   84.964436] [    T928] [c0000011a7157e00] [c000000000de21d8] pci_lock_rescan_remove+0x28/0x40\\n[   84.964439] [    T928] [c0000011a7157e20] [c00000000004ed98] eeh_pe_bus_get+0x48/0xc0\\n[   84.964442] [    T928] [c0000011a7157e50] [c00000\\n---truncated---\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/6e6561231c6cfc32c5631aeecc0928ff2b14265c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/788dd28fd49610d6047cbb15dbf1186afffdfbaf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/815a8d2feb5615ae7f0b5befd206af0b0160614c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/87a1f93986aa1500b85aeff16b0b71c29ea116ea\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/89810e2d80281d42f855fac813786758ee16e323\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b85ee287bfe52c6b2d9b41758b5e0d08679d5b39\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f49faa4a64f8ac0e38983e606075b25dfcfc9ad4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f8b16d5764ee1e78c1ef333017ad383ffe76fcdc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.