CVE-2026-90244 (GCVE-0-2026-90244)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:07 – Updated: 2026-10-19 09:00
VLAI
Title
iommu/dma: Restore locking around msi_page_list
Summary
In the Linux kernel, the following vulnerability has been resolved: iommu/dma: Restore locking around msi_page_list Unlike a group's default domain, which is always freshly allocated and privately owned (iommu_group_alloc_default_domain()), VFIO type1's legacy container merges any newly attached group into an existing domain whenever their iommu_ops and cache-coherency enforcement match. iommu_dma_get_msi_page() only asserts the caller's own group mutex is held (iommu_group_mutex_assert()). On an IOMMU that publishes IOMMU_RESV_SW_MSI, e.g. ARM SMMU, a VM with two such devices assigned through the legacy container can have their guest drivers probe and allocate MSIs in parallel; each host-side VFIO_DEVICE_SET_IRQS lands on a different device fd and group mutex, but both devices' domains are the same merged domain, so both can enter iommu_dma_get_msi_page() concurrently and corrupt msi_page_list. commit 288683c92b1a ("iommu: Make iommu_dma_prepare_msi() into a generic operation") dropped the prior msi_prepare_lock on the reasoning that "each iommu_domain is unique to a group," which holds for default domains but not this VFIO type1 case. Restore the static lock, since it's only guarding a corner case and will likely never be contended. iommufd avoids the equivalent problem by having its own callers (iommufd_sw_map_msi()) take a ctx-wide sw_msi_lock before ever reaching the shared list. VFIO type1 can't mirror that since it dispatches to iommu_dma_sw_msi() which is outside VFIO's jurisdiction.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6637 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 288683c92b1abc32277c83819bea287af614d239 , < e3c53e9173a47d5ce1fae020f2c6b1fb3c1123c2 (git)
Affected: 288683c92b1abc32277c83819bea287af614d239 , < 2af1e99ec14d226d66ceb9f16c663ee2568e6676 (git)
Affected: 288683c92b1abc32277c83819bea287af614d239 , < 5a9e89ea34e0e34ac5d7e949042d665533549e40 (git)
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Linux Linux Affected: 6.15
Unaffected: 0 , < 6.15 (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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Show details on NVD website
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          "programFiles": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/dma: Restore locking around msi_page_list\n\nUnlike a group\u0027s default domain, which is always freshly allocated\nand privately owned (iommu_group_alloc_default_domain()), VFIO type1\u0027s\nlegacy container merges any newly attached group into an existing\ndomain whenever their iommu_ops and cache-coherency enforcement match.\n\niommu_dma_get_msi_page() only asserts the caller\u0027s own group mutex is\nheld (iommu_group_mutex_assert()). On an IOMMU that publishes\nIOMMU_RESV_SW_MSI, e.g. ARM SMMU, a VM with two such devices assigned\nthrough the legacy container can have their guest drivers probe and\nallocate MSIs in parallel; each host-side VFIO_DEVICE_SET_IRQS lands\non a different device fd and group mutex, but both devices\u0027 domains\nare the same merged domain, so both can enter\niommu_dma_get_msi_page() concurrently and corrupt msi_page_list.\n\ncommit 288683c92b1a (\"iommu: Make iommu_dma_prepare_msi() into a\ngeneric operation\") dropped the prior msi_prepare_lock on the\nreasoning that \"each iommu_domain is unique to a group,\" which holds\nfor default domains but not this VFIO type1 case. Restore the static\nlock, since it\u0027s only guarding a corner case and will likely never\nbe contended.\n\niommufd avoids the equivalent problem by having its own callers\n(iommufd_sw_map_msi()) take a ctx-wide sw_msi_lock before ever\nreaching the shared list. VFIO type1 can\u0027t mirror that since it\ndispatches to iommu_dma_sw_msi() which is outside VFIO\u0027s jurisdiction."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
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              "lang": "en",
              "value": "AV:L - The race is entered only via ioctl(VFIO_DEVICE_SET_IRQS) on a local vfio-pci fd: vfio_pci_core_ioctl \u2192 vfio_pci_ioctl_set_irqs \u2192 vfio_pci_set_msi_trigger \u2192 vfio_msi_enable \u2192 pci_alloc_irq_vectors \u2192 its_irq_domain_alloc \u2192 iommu_dma_prepare_msi \u2192 iommu_dma_get_msi_page. No received packet or protocol message carries the trigger.\nAC:L - The attacker issues concurrent VFIO_DEVICE_SET_IRQS on two device fds whose groups vfio_iommu_type1_attach_group already merged onto one domain; iommu_dma_prepare_msi takes only each device\u0027s own group-\u003emutex, so both threads run iommu_dma_get_msi_page() on the shared msi_page_list. The attacker owns both sides of the race.\nPR:L - vfio_pci_ioctl_set_irqs() and vfio_group_fops_open() have no capable() check on the IOMMU-backed path; CAP_SYS_RAWIO gates only VFIO_NO_IOMMU. An unprivileged qemu/kvm-group or DPDK user with two assigned /dev/vfio nodes can attach them to a type1 container and call SET_IRQS.\nUI:N - The attacker attaches its own groups with vfio_iommu_type1_attach_group and fires the concurrent SET_IRQS ioctls on fds it already holds; no other user must mount, open, or otherwise act.\nS:U - The race corrupts the host kernel\u0027s msi_page_list of iommu_dma_msi_page objects. iommu_map() still maps only the irqchip doorbell from its-\u003eget_msi_base() into the IOMMU_RESV_SW_MSI window vfio_iommu_has_sw_msi() reserved; that does not install extra host-RAM translations or bypass the DMA/VM isolation boundary.\nC:H - Concurrent list_for_each_entry() versus unlocked list_add() on msi_page_list can follow a torn next pointer into a freed iommu_dma_msi_page, a use-after-free read of phys/iova and neighboring slab.\nI:H - Unlocked list_add() of iommu_dma_msi_page nodes overwrites kernel list next/prev, and the unlocked msi_cookie-\u003emsi_iova bump in iommu_dma_alloc_iova() can alias IOVAs; a sprayable UAF of that object is an arbitrary-write and control-flow primitive.\nA:H - A corrupted msi_page_list walk or list_add in iommu_dma_get_msi_page() dereferences invalid list pointers and oopses or panics the host kernel even if the UAF is not fully weaponized."
            }
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        "dateUpdated": "2026-10-19T09:00:20.156Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/2af1e99ec14d226d66ceb9f16c663ee2568e6676"
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        {
          "url": "https://git.kernel.org/stable/c/5a9e89ea34e0e34ac5d7e949042d665533549e40"
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      "title": "iommu/dma: Restore locking around msi_page_list",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90244",
    "datePublished": "2026-09-17T16:07:47.121Z",
    "dateReserved": "2026-09-11T19:38:34.795Z",
    "dateUpdated": "2026-10-19T09:00:20.156Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-11-06",
      "epss": "0.00173",
      "percentile": "0.06828"
    },
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      "current_release_date": "2026-10-21T18:37:33.000Z",
      "cve": "CVE-2026-90244",
      "id": "msrc_CVE-2026-90244",
      "initial_release_date": "2026-10-20T22:22:30.000Z",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "iommu/dma: Restore locking around msi_page_list",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-90244.json",
      "version": "2"
    },
    "nvd": {
      "cve": {
        "affected": [
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                "product": "Linux",
                "programFiles": [
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/dma: Restore locking around msi_page_list\n\nUnlike a group\u0027s default domain, which is always freshly allocated\nand privately owned (iommu_group_alloc_default_domain()), VFIO type1\u0027s\nlegacy container merges any newly attached group into an existing\ndomain whenever their iommu_ops and cache-coherency enforcement match.\n\niommu_dma_get_msi_page() only asserts the caller\u0027s own group mutex is\nheld (iommu_group_mutex_assert()). On an IOMMU that publishes\nIOMMU_RESV_SW_MSI, e.g. ARM SMMU, a VM with two such devices assigned\nthrough the legacy container can have their guest drivers probe and\nallocate MSIs in parallel; each host-side VFIO_DEVICE_SET_IRQS lands\non a different device fd and group mutex, but both devices\u0027 domains\nare the same merged domain, so both can enter\niommu_dma_get_msi_page() concurrently and corrupt msi_page_list.\n\ncommit 288683c92b1a (\"iommu: Make iommu_dma_prepare_msi() into a\ngeneric operation\") dropped the prior msi_prepare_lock on the\nreasoning that \"each iommu_domain is unique to a group,\" which holds\nfor default domains but not this VFIO type1 case. Restore the static\nlock, since it\u0027s only guarding a corner case and will likely never\nbe contended.\n\niommufd avoids the equivalent problem by having its own callers\n(iommufd_sw_map_msi()) take a ctx-wide sw_msi_lock before ever\nreaching the shared list. VFIO type1 can\u0027t mirror that since it\ndispatches to iommu_dma_sw_msi() which is outside VFIO\u0027s jurisdiction."
          }
        ],
        "id": "CVE-2026-90244",
        "lastModified": "2026-10-19T09:19:14.897",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
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              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
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        "published": "2026-09-17T17:17:20.400",
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        "vulnStatus": "Received"
      }
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      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-06T01:34:14+00:00",
      "cve": "CVE-2026-90244",
      "id": "CVE-2026-90244",
      "initial_release_date": "2026-09-17T00:00:00+00:00",
      "product_status:known_affected": "110",
      "product_status:known_not_affected": "93",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: iommu/dma: Restore locking around msi_page_list",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90244.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-20T00:41:23Z",
      "cve": "CVE-2026-90244",
      "id": "CVE-2026-90244",
      "initial_release_date": "2026-09-18T00:19:25Z",
      "product_status:known_affected": "0",
      "product_status:known_not_affected": "348",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-90244",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-90244.json",
      "version": "5"
    }
  }
}



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