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vfio/pci: Create persistent INTx handler

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: vfio/pci: Create persistent INTx handler A vulnerability exists where the eventfd for INTx signaling can be deconfigured, which unregisters the IRQ handler but still allows eventfds to be signaled with a NULL context through the SET_IRQS ioctl or through unmask irqfd if the device interrupt is pending. Ideally this could be solved with some additional locking; the igate mutex serializes the ioctl and config space accesses, and the interrupt handler is unregistered relative to the trigger, but the irqfd path runs asynchronous to those. The igate mutex cannot be acquired from the atomic context of the eventfd wake function. Disabling the irqfd relative to the eventfd registration is potentially incompatible with existing userspace. As a result, the solution implemented here moves configuration of the INTx interrupt handler to track the lifetime of the INTx context object and irq_type configuration, rather than registration of a particular trigger eventfd. Synchronization is added between the ioctl path and eventfd_signal() wrapper such that the eventfd trigger can be dynamically updated relative to in-flight interrupts or irqfd callbacks.

Announced Source revision 1
Original source ↗

CVE-2024-26812

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2024-26812

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "89e1f7d4c66d85f42c3d52ea3866eb10cadf6153",
        "lessThan": "b18fa894d615c8527e15d96b76c7448800e13899",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "89e1f7d4c66d85f42c3d52ea3866eb10cadf6153",
        "lessThan": "27d40bf72dd9a6600b76ad05859176ea9a1b4897",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "89e1f7d4c66d85f42c3d52ea3866eb10cadf6153",
        "lessThan": "4cb0d7532126d23145329826c38054b4e9a05e7c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "89e1f7d4c66d85f42c3d52ea3866eb10cadf6153",
        "lessThan": "7d29d4c72c1e196cce6969c98072a272d1a703b3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "89e1f7d4c66d85f42c3d52ea3866eb10cadf6153",
        "lessThan": "69276a555c740acfbff13fb5769ee9c92e1c828e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "89e1f7d4c66d85f42c3d52ea3866eb10cadf6153",
        "lessThan": "4c089cefe30924fbe20dd1ee92774ea1f5eca834",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "89e1f7d4c66d85f42c3d52ea3866eb10cadf6153",
        "lessThan": "0e09cf81959d9f12b75ad5c6dd53d237432ed034",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "89e1f7d4c66d85f42c3d52ea3866eb10cadf6153",
        "lessThan": "18c198c96a815c962adc2b9b77909eec0be7df4d",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/vfio/pci/vfio_pci_intrs.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.6"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.6",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.4.274",
        "versionType": "semver",
        "lessThanOrEqual": "5.4.*"
      },
      {
        "status": "unaffected",
        "version": "5.10.215",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.154",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.84",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.24",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.7.12",
        "versionType": "semver",
        "lessThanOrEqual": "6.7.*"
      },
      {
        "status": "unaffected",
        "version": "6.8.3",
        "versionType": "semver",
        "lessThanOrEqual": "6.8.*"
      },
      {
        "status": "unaffected",
        "version": "6.9",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/vfio/pci/vfio_pci_intrs.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2024-26812

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#26428 · Revision 1
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Publisher date
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