CVE-2024-26810 vfio/pci: Lock external INTx masking ops

2024-04-0508:24:41

Linux

www.cve.org

linux kernel

vfio/pci

vulnerability

resolved

locking

external intx masking ops

racing configuration changes

ioctl

synchronization

7.1 High

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

13.2%

JSON

In the Linux kernel, the following vulnerability has been resolved:

vfio/pci: Lock external INTx masking ops

Mask operations through config space changes to DisINTx may race INTx
configuration changes via ioctl. Create wrappers that add locking for
paths outside of the core interrupt code.

In particular, irq_type is updated holding igate, therefore testing
is_intx() requires holding igate. For example clearing DisINTx from
config space can otherwise race changes of the interrupt configuration.

This aligns interfaces which may trigger the INTx eventfd into two
camps, one side serialized by igate and the other only enabled while
INTx is configured. A subsequent patch introduces synchronization for
the latter flows.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/vfio/pci/vfio_pci_intrs.c"
    ],
    "versions": [
      {
        "version": "89e1f7d4c66d",
        "lessThan": "1e71b6449d55",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "89e1f7d4c66d",
        "lessThan": "3dd9be6cb55e",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "89e1f7d4c66d",
        "lessThan": "ec73e0797292",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "89e1f7d4c66d",
        "lessThan": "3fe0ac10bd11",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "89e1f7d4c66d",
        "lessThan": "04a4a017b9ff",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "89e1f7d4c66d",
        "lessThan": "6fe478d855b2",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "89e1f7d4c66d",
        "lessThan": "03505e3344b0",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "89e1f7d4c66d",
        "lessThan": "810cd4bb5345",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/vfio/pci/vfio_pci_intrs.c"
    ],
    "versions": [
      {
        "version": "3.6",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "3.6",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.4.274",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.215",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.154",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.1.84",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.24",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.7.12",
        "lessThanOrEqual": "6.7.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.8.3",
        "lessThanOrEqual": "6.8.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.9",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]