CVE-2026-80620 (GCVE-0-2026-80620)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:48 – Updated: 2026-08-28 06:48
VLAI
Title
Revert "PCI/MSI: Unmap MSI-X region on error"
Summary
In the Linux kernel, the following vulnerability has been resolved: Revert "PCI/MSI: Unmap MSI-X region on error" This reverts commit 1a8d4c6ecb4c81261bcdf13556abd4a958eca202. Commit 1a8d4c6ecb4c ("PCI/MSI: Unmap MSI-X region on error") added an iounmap(dev->msix_base) on the error path of msix_capability_init() to release the MSI-X region when msix_setup_interrupts() fails. When msix_setup_interrupts() fails, the call chain is: msix_setup_interrupts() -> __msix_setup_interrupts() struct pci_dev *dev __free(free_msi_irqs) = __dev; ... return ret; // __free cleanup fires on error The __free(free_msi_irqs) cleanup calls pci_free_msi_irqs(), which already handles the unmap: void pci_free_msi_irqs(struct pci_dev *dev) { pci_msi_teardown_msi_irqs(dev); if (dev->msix_base) { iounmap(dev->msix_base); // already unmapped here dev->msix_base = NULL; // and set to NULL } } So dev->msix_base is unmapped and set to NULL before msix_setup_interrupts() returns to msix_capability_init(). The "goto out_unmap" introduced by commit 1a8d4c6ecb4c ("PCI/MSI: Unmap MSI-X region on error") then calls iounmap() a second time on a NULL pointer. This was reproduced on Intel Emerald Rapids (192 CPUs) while running tools/testing/selftests/kexec/test_kexec_jump.sh: WARNING: CPU#44 at iounmap+0x2a/0xe0 RIP: 0010:iounmap+0x2a/0xe0 RDI: 0000000000000000 Call Trace: msix_capability_init+0x317/0x3f0 __pci_enable_msix_range+0x21d/0x2c0 pci_alloc_irq_vectors_affinity+0xa9/0x130 nvme_setup_io_queues+0x2a8/0x420 [nvme] nvme_reset_work+0x151/0x340 [nvme] ... RDI=0 confirms iounmap() is called with NULL. Restore the original "goto out_disable" and leave the unmap to the existing __free(free_msi_irqs) cleanup.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4a7589b615a3db6792d36b874add86cd22188c95 , < 82e120a7dd566c476ba923d30e3fb78e8118a1dd (git)
Affected: 5f007c6acaa7d9a543b492c1e48c48a0ea1d7147 , < 6848ca381edff84f87dd1b6973848c271541e813 (git)
Affected: 76f7abd4ee0188f06465bdd3c053fdc5e8595152 , < 0a2aeb02894b839ecc3ece6dc7e5c3d6c3def16f (git)
Affected: aee8db5f048616990dbdefcc25689ade0a2620ec , < f79519f636059b007d6abc91652f36dea4f54a20 (git)
Affected: 1a8d4c6ecb4c81261bcdf13556abd4a958eca202 , < 3691a82be2095abaf3326a1cbf7b25858a1d959c (git)
Affected: 1a8d4c6ecb4c81261bcdf13556abd4a958eca202 , < f64e03da0d83cb173743888bff4a7e61476a8fc2 (git)
Affected: 19bf27b450fcd5309bacd614b12bd7de1ac6535b (git)
Affected: 6.1.165 , < 6.1.178 (semver)
Affected: 6.6.128 , < 6.6.145 (semver)
Affected: 6.12.75 , < 6.12.97 (semver)
Affected: 6.18.16 , < 6.18.40 (semver)
Affected: 6.19.6 , < 6.20 (semver)
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Linux Linux Affected: 7.0
Unaffected: 0 , < 7.0 (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRevert \"PCI/MSI: Unmap MSI-X region on error\"\n\nThis reverts commit 1a8d4c6ecb4c81261bcdf13556abd4a958eca202.\n\nCommit 1a8d4c6ecb4c (\"PCI/MSI: Unmap MSI-X region on error\") added an\niounmap(dev-\u003emsix_base) on the error path of msix_capability_init() to\nrelease the MSI-X region when msix_setup_interrupts() fails.\n\nWhen msix_setup_interrupts() fails, the call chain is:\n\n  msix_setup_interrupts()\n    -\u003e __msix_setup_interrupts()\n         struct pci_dev *dev __free(free_msi_irqs) = __dev;\n         ...\n         return ret;  // __free cleanup fires on error\n\nThe __free(free_msi_irqs) cleanup calls pci_free_msi_irqs(), which\nalready handles the unmap:\n\n  void pci_free_msi_irqs(struct pci_dev *dev)\n  {\n      pci_msi_teardown_msi_irqs(dev);\n      if (dev-\u003emsix_base) {\n          iounmap(dev-\u003emsix_base);   // already unmapped here\n          dev-\u003emsix_base = NULL;     // and set to NULL\n      }\n  }\n\nSo dev-\u003emsix_base is unmapped and set to NULL before\nmsix_setup_interrupts() returns to msix_capability_init(). The\n\"goto out_unmap\" introduced by commit 1a8d4c6ecb4c (\"PCI/MSI: Unmap\nMSI-X region on error\") then calls iounmap() a second time on a NULL\npointer.\n\nThis was reproduced on Intel Emerald Rapids (192 CPUs) while\nrunning tools/testing/selftests/kexec/test_kexec_jump.sh:\n\n  WARNING: CPU#44 at iounmap+0x2a/0xe0\n  RIP: 0010:iounmap+0x2a/0xe0\n  RDI: 0000000000000000\n  Call Trace:\n   msix_capability_init+0x317/0x3f0\n   __pci_enable_msix_range+0x21d/0x2c0\n   pci_alloc_irq_vectors_affinity+0xa9/0x130\n   nvme_setup_io_queues+0x2a8/0x420 [nvme]\n   nvme_reset_work+0x151/0x340 [nvme]\n   ...\n\nRDI=0 confirms iounmap() is called with NULL.\n\nRestore the original \"goto out_disable\" and leave the unmap to the\nexisting __free(free_msi_irqs) cleanup."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-28T06:48:40.340Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/82e120a7dd566c476ba923d30e3fb78e8118a1dd"
        },
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          "url": "https://git.kernel.org/stable/c/6848ca381edff84f87dd1b6973848c271541e813"
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          "url": "https://git.kernel.org/stable/c/0a2aeb02894b839ecc3ece6dc7e5c3d6c3def16f"
        },
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          "url": "https://git.kernel.org/stable/c/f79519f636059b007d6abc91652f36dea4f54a20"
        },
        {
          "url": "https://git.kernel.org/stable/c/3691a82be2095abaf3326a1cbf7b25858a1d959c"
        },
        {
          "url": "https://git.kernel.org/stable/c/f64e03da0d83cb173743888bff4a7e61476a8fc2"
        }
      ],
      "title": "Revert \"PCI/MSI: Unmap MSI-X region on error\"",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80620",
    "datePublished": "2026-08-28T06:48:40.340Z",
    "dateReserved": "2026-08-26T14:34:25.774Z",
    "dateUpdated": "2026-08-28T06:48:40.340Z",
    "state": "PUBLISHED"
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    "epss": {
      "cve": "CVE-2026-80620",
      "date": "2026-09-01",
      "epss": "0.00172",
      "percentile": "0.06782"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-80620\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-28T08:16:46.083\",\"lastModified\":\"2026-08-28T08:16:46.083\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nRevert \\\"PCI/MSI: Unmap MSI-X region on error\\\"\\n\\nThis reverts commit 1a8d4c6ecb4c81261bcdf13556abd4a958eca202.\\n\\nCommit 1a8d4c6ecb4c (\\\"PCI/MSI: Unmap MSI-X region on error\\\") added an\\niounmap(dev-\u003emsix_base) on the error path of msix_capability_init() to\\nrelease the MSI-X region when msix_setup_interrupts() fails.\\n\\nWhen msix_setup_interrupts() fails, the call chain is:\\n\\n  msix_setup_interrupts()\\n    -\u003e __msix_setup_interrupts()\\n         struct pci_dev *dev __free(free_msi_irqs) = __dev;\\n         ...\\n         return ret;  // __free cleanup fires on error\\n\\nThe __free(free_msi_irqs) cleanup calls pci_free_msi_irqs(), which\\nalready handles the unmap:\\n\\n  void pci_free_msi_irqs(struct pci_dev *dev)\\n  {\\n      pci_msi_teardown_msi_irqs(dev);\\n      if (dev-\u003emsix_base) {\\n          iounmap(dev-\u003emsix_base);   // already unmapped here\\n          dev-\u003emsix_base = NULL;     // and set to NULL\\n      }\\n  }\\n\\nSo dev-\u003emsix_base is unmapped and set to NULL before\\nmsix_setup_interrupts() returns to msix_capability_init(). The\\n\\\"goto out_unmap\\\" introduced by commit 1a8d4c6ecb4c (\\\"PCI/MSI: Unmap\\nMSI-X region on error\\\") then calls iounmap() a second time on a NULL\\npointer.\\n\\nThis was reproduced on Intel Emerald Rapids (192 CPUs) while\\nrunning tools/testing/selftests/kexec/test_kexec_jump.sh:\\n\\n  WARNING: CPU#44 at iounmap+0x2a/0xe0\\n  RIP: 0010:iounmap+0x2a/0xe0\\n  RDI: 0000000000000000\\n  Call Trace:\\n   msix_capability_init+0x317/0x3f0\\n   __pci_enable_msix_range+0x21d/0x2c0\\n   pci_alloc_irq_vectors_affinity+0xa9/0x130\\n   nvme_setup_io_queues+0x2a8/0x420 [nvme]\\n   nvme_reset_work+0x151/0x340 [nvme]\\n   ...\\n\\nRDI=0 confirms iounmap() is called with NULL.\\n\\nRestore the original \\\"goto out_disable\\\" and leave the unmap to the\\nexisting __free(free_msi_irqs) cleanup.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/pci/msi/msi.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4a7589b615a3db6792d36b874add86cd22188c95\",\"lessThan\":\"82e120a7dd566c476ba923d30e3fb78e8118a1dd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5f007c6acaa7d9a543b492c1e48c48a0ea1d7147\",\"lessThan\":\"6848ca381edff84f87dd1b6973848c271541e813\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"76f7abd4ee0188f06465bdd3c053fdc5e8595152\",\"lessThan\":\"0a2aeb02894b839ecc3ece6dc7e5c3d6c3def16f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"aee8db5f048616990dbdefcc25689ade0a2620ec\",\"lessThan\":\"f79519f636059b007d6abc91652f36dea4f54a20\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1a8d4c6ecb4c81261bcdf13556abd4a958eca202\",\"lessThan\":\"3691a82be2095abaf3326a1cbf7b25858a1d959c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1a8d4c6ecb4c81261bcdf13556abd4a958eca202\",\"lessThan\":\"f64e03da0d83cb173743888bff4a7e61476a8fc2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"19bf27b450fcd5309bacd614b12bd7de1ac6535b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6.1.165\",\"lessThan\":\"6.1.178\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.6.128\",\"lessThan\":\"6.6.145\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.12.75\",\"lessThan\":\"6.12.97\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.18.16\",\"lessThan\":\"6.18.40\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.19.6\",\"lessThan\":\"6.20\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/pci/msi/msi.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"7.0\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"7.0\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0a2aeb02894b839ecc3ece6dc7e5c3d6c3def16f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3691a82be2095abaf3326a1cbf7b25858a1d959c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6848ca381edff84f87dd1b6973848c271541e813\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/82e120a7dd566c476ba923d30e3fb78e8118a1dd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f64e03da0d83cb173743888bff4a7e61476a8fc2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f79519f636059b007d6abc91652f36dea4f54a20\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-31T11:14:58+00:00",
      "cve": "CVE-2026-80620",
      "id": "CVE-2026-80620",
      "initial_release_date": "2026-08-28T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Revert \"PCI/MSI: Unmap MSI-X region on error\"",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80620.json",
      "version": "3"
    }
  }
}



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