PCI: plda: Fix use-after-free of event IRQs during teardown

{
  "id": "28f93f50651ad4b1524dea215aa339424e9cc87daa139f970a03b205ca95ba7f",
  "url": "https://osv.dev/vulnerability/CVE-2026-89455",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "PCI: plda: Fix use-after-free of event IRQs during teardown",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: PCI: plda: Fix use-after-free of event IRQs during teardown plda_pcie_irq_domain_deinit() removes pcie->event_domain via irq_domain_remove(), but the per-event IRQs mapped from that domain are requested with devm_request_irq() in plda_init_interrupts(). The actual free_irq() for a devm-managed IRQ is deferred by devres until after the calling probe()/remove() function returns. This means irq_domain_remove() can free the domain's internal data before the deferred free_irq() for IRQs still mapped into it has run. When devres later processes that deferred cleanup, it can end up dereferencing the already-freed domain. Free each event IRQ explicitly with devm_free_irq() before removing the domain. This triggers the free immediately and removes the IRQ from the devres tracking list, so devres will not attempt to free it a second time later. Also dispose of the event, INTx, and MSI IRQ mappings with irq_dispose_mapping() before their owning domains are removed. Finally, guard the calls to irq_set_chained_handler_and_data() for pcie->irq, pcie->msi_irq, and pcie->intx_irq so they only run when those fields hold a valid (>0) IRQ number. This is a pre-existing issue, flagged by automated review during work on an earlier, unrelated patch to this driver. Build-tested and boot-tested on StarFive VisionFive v1.2A board",
    "evidence": "osv:CVE-2026-89455",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.109",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.50",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-89455",
      "aliases": [
        "CVE-2026-89455"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "fixed": "1d0159e139261996a3ca21798d9114aab2124d3c"
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                {
                  "fixed": "01c2f0c66bd1f892db9c6e82976da6b463cc4427"
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                {
                  "fixed": "e3589ca5f2e6477774753a2202c21509428d4701"
                },
                {
                  "fixed": "26b73bae01d6eb81a4a38f36101812f20b2639de"
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89455.json"
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        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "6.11.0"
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            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "6.13.0"
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                {
                  "fixed": "6.18.50"
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              ]
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            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
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                {
                  "fixed": "7.2.4"
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89455.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:22.141795773Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/01c2f0c66bd1f892db9c6e82976da6b463cc4427",
        "https://git.kernel.org/stable/c/1d0159e139261996a3ca21798d9114aab2124d3c",
        "https://git.kernel.org/stable/c/26b73bae01d6eb81a4a38f36101812f20b2639de",
        "https://git.kernel.org/stable/c/e3589ca5f2e6477774753a2202c21509428d4701",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89455.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-89455",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89455.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-89455",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 488374,
  "published_at": "2026-09-11T19:43:19.37+00:00"
}