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FKIE_CVE-2026-80620

Vulnerability from fkie_nvd - Published: 2026-08-28 08:16 - Updated: 2026-08-28 08:16
Severity
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0a2aeb02894b839ecc3ece6dc7e5c3d6c3def16f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3691a82be2095abaf3326a1cbf7b25858a1d959c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6848ca381edff84f87dd1b6973848c271541e813
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/82e120a7dd566c476ba923d30e3fb78e8118a1dd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f64e03da0d83cb173743888bff4a7e61476a8fc2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f79519f636059b007d6abc91652f36dea4f54a20
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/pci/msi/msi.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "82e120a7dd566c476ba923d30e3fb78e8118a1dd",
              "status": "affected",
              "version": "4a7589b615a3db6792d36b874add86cd22188c95",
              "versionType": "git"
            },
            {
              "lessThan": "6848ca381edff84f87dd1b6973848c271541e813",
              "status": "affected",
              "version": "5f007c6acaa7d9a543b492c1e48c48a0ea1d7147",
              "versionType": "git"
            },
            {
              "lessThan": "0a2aeb02894b839ecc3ece6dc7e5c3d6c3def16f",
              "status": "affected",
              "version": "76f7abd4ee0188f06465bdd3c053fdc5e8595152",
              "versionType": "git"
            },
            {
              "lessThan": "f79519f636059b007d6abc91652f36dea4f54a20",
              "status": "affected",
              "version": "aee8db5f048616990dbdefcc25689ade0a2620ec",
              "versionType": "git"
            },
            {
              "lessThan": "3691a82be2095abaf3326a1cbf7b25858a1d959c",
              "status": "affected",
              "version": "1a8d4c6ecb4c81261bcdf13556abd4a958eca202",
              "versionType": "git"
            },
            {
              "lessThan": "f64e03da0d83cb173743888bff4a7e61476a8fc2",
              "status": "affected",
              "version": "1a8d4c6ecb4c81261bcdf13556abd4a958eca202",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "19bf27b450fcd5309bacd614b12bd7de1ac6535b",
              "versionType": "git"
            },
            {
              "lessThan": "6.1.178",
              "status": "affected",
              "version": "6.1.165",
              "versionType": "semver"
            },
            {
              "lessThan": "6.6.145",
              "status": "affected",
              "version": "6.6.128",
              "versionType": "semver"
            },
            {
              "lessThan": "6.12.97",
              "status": "affected",
              "version": "6.12.75",
              "versionType": "semver"
            },
            {
              "lessThan": "6.18.40",
              "status": "affected",
              "version": "6.18.16",
              "versionType": "semver"
            },
            {
              "lessThan": "6.20",
              "status": "affected",
              "version": "6.19.6",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/pci/msi/msi.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.0"
            },
            {
              "lessThan": "7.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "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."
    }
  ],
  "id": "CVE-2026-80620",
  "lastModified": "2026-08-28T08:16:46.083",
  "metrics": {},
  "published": "2026-08-28T08:16:46.083",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "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"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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