CVE-2026-89448

Full vulnerability record from the local CVENow database.
Description

In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Force requesting ACS when tboot is enabled Currently the conditions of requesting ACS in detect_intel_iommu() don't include tboot, leading to a possible misconfiguration with ACS disabled (e.g. due to user opts) while iommu is later forced on by tboot_force_iommu(). Fix it by checking tboot in detect_intel_iommu().
Severity
CRITICAL
CVSS score
9.3 (v3.1)
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-09-11 20:19:25.347000
Last modified
2026-10-30 13:20:16.327000
View original CVE JSON
{
  "id": "CVE-2026-89448",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-09-11T20:19:25.347",
  "lastModified": "2026-10-30T13:20:16.327",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/vt-d: Force requesting ACS when tboot is enabled\n\nCurrently the conditions of requesting ACS in detect_intel_iommu()\ndon't include tboot, leading to a possible misconfiguration with ACS\ndisabled (e.g. due to user opts) while iommu is later forced on by\ntboot_force_iommu().\n\nFix it by checking tboot in detect_intel_iommu()."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/iommu/intel/dmar.c",
            "drivers/iommu/intel/iommu.c",
            "drivers/iommu/intel/iommu.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "5d990b627537e59a3a2f039ff588a4750e9c1a6a",
              "lessThan": "3fd2b60ea9bd18348f5e971678f31041ef211047",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "5d990b627537e59a3a2f039ff588a4750e9c1a6a",
              "lessThan": "579eb867d3da63f3b5e32f235925e1daa7ec70d0",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "5d990b627537e59a3a2f039ff588a4750e9c1a6a",
              "lessThan": "aaeb81241e802c86be69394f72d49fde3f861fbb",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "5d990b627537e59a3a2f039ff588a4750e9c1a6a",
              "lessThan": "45705a6bfdb283f7b3b509010fd617b72f942537",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "5d990b627537e59a3a2f039ff588a4750e9c1a6a",
              "lessThan": "87bc611c6c98a41c00feb7b06b0c297dd141a2ae",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "5d990b627537e59a3a2f039ff588a4750e9c1a6a",
              "lessThan": "607432b2618b61df81134be0ef2562b8300c1216",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/iommu/intel/dmar.c",
            "drivers/iommu/intel/iommu.c",
            "drivers/iommu/intel/iommu.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "2.6.33",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "2.6.33",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.191",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.157",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.109",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.50",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.4",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
          "baseScore": 9.3,
          "baseSeverity": "CRITICAL",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 2.5,
        "impactScore": 6.0
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-10-16T19:22:16.872682Z",
          "id": "CVE-2026-89448",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/3fd2b60ea9bd18348f5e971678f31041ef211047",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/45705a6bfdb283f7b3b509010fd617b72f942537",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/579eb867d3da63f3b5e32f235925e1daa7ec70d0",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/607432b2618b61df81134be0ef2562b8300c1216",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/87bc611c6c98a41c00feb7b06b0c297dd141a2ae",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/aaeb81241e802c86be69394f72d49fde3f861fbb",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}