CVE-2026-89823 (GCVE-0-2026-89823)
Vulnerability from cvelistv5
Published
2026-09-16 10:30
Modified
2026-10-19 08:53
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: drm: fix race between partial drm_dev_register() failure and ioctl If drm_dev_register() fails after registering a minor (e.g. render minor registered, primary minor fails), userspace could have opened the first minor and entered a drm_dev_enter() critical section. Since the unplugged flag was never set, the ioctl proceeds while the error path tears down device resources. Fix this by introducing drm_dev_synchronize_unplug(), which sets the unplugged flag and waits for the SRCU barrier, ensuring all in-flight drm_dev_enter() critical sections complete before cleanup proceeds; call it on the error path of drm_dev_register().
References
Impacted products
Vendor Product Version
Linux Linux Version: bee330f3d67273a68dcb99f59480d59553c008b2
Version: bee330f3d67273a68dcb99f59480d59553c008b2
Version: bee330f3d67273a68dcb99f59480d59553c008b2
Version: bee330f3d67273a68dcb99f59480d59553c008b2
Version: bee330f3d67273a68dcb99f59480d59553c008b2
Version: bee330f3d67273a68dcb99f59480d59553c008b2
Version: bee330f3d67273a68dcb99f59480d59553c008b2
Version: bee330f3d67273a68dcb99f59480d59553c008b2
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/drm_drv.c"
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          "vendor": "Linux",
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          "vendor": "Linux",
          "versions": [
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              "version": "4.18"
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              "status": "unaffected",
              "version": "0",
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              "version": "5.10.270",
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            {
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              "version": "5.15.221",
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              "version": "6.1.188",
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              "version": "6.6.157",
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              "status": "unaffected",
              "version": "6.12.110",
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              "status": "unaffected",
              "version": "6.18.51",
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              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.270",
                  "versionStartIncluding": "4.18",
                  "vulnerable": true
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                  "versionEndExcluding": "7.3",
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                  "vulnerable": true
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm: fix race between partial drm_dev_register() failure and ioctl\n\nIf drm_dev_register() fails after registering a minor (e.g. render minor\nregistered, primary minor fails), userspace could have opened the first\nminor and entered a drm_dev_enter() critical section. Since the\nunplugged flag was never set, the ioctl proceeds while the error path\ntears down device resources.\n\nFix this by introducing drm_dev_synchronize_unplug(), which sets the\nunplugged flag and waits for the SRCU barrier, ensuring all in-flight\ndrm_dev_enter() critical sections complete before cleanup proceeds; call\nit on the error path of drm_dev_register()."
        }
      ],
      "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": [
            {
              "lang": "en",
              "value": "AV:L - The race is entered by opening a newly published DRM minor (/dev/dri/renderD* or card*) and issuing ioctl/mmap into drm_dev_enter(); that is a local char-dev syscall path, not network, adjacent-radio, or USB packet processing.\nAC:L - The attacker controls the userspace side (inotify on the new node, open, concurrent DRM_RENDER_ALLOW ioctl/mmap) and can force later drm_dev_register() steps to fail after the first minor is live (ENOMEM in create_compat_control_link or drm_modeset_register_all). Modern drivers skip drm_global_mutex, so open is not serialized with register.\nPR:L - The commit\u0027s example publishes the render minor first; that node has no CAP_SYS_ADMIN check, and the overlapping ioctls are DRM_RENDER_ALLOW. Unprivileged local users on phones, desktops, and GPU VMs routinely open /dev/dri/renderD*.\nUI:N - The attacker opens their own DRM fd and issues ioctls; GPU or hotplug display probe runs in kernel driver init and does not require a victim to mount media or open a file.\nS:U - The use-after-free is of host-kernel DRM/driver resources that drm_dev_enter() is meant to protect, remaining in the same kernel authority; this is not a VM escape or IOMMU/DMA bypass.\nC:H - On drm_dev_register() error, probe rollback frees devm MMIO and driver objects while an in-flight drm_dev_enter() ioctl/mmap still uses them, a use-after-free that enables kernel memory disclosure.\nI:H - The same use-after-free of driver state during concurrent ioctl/mmap allows heap spraying, arbitrary writes, and control-flow hijack, matching kernel guidance that UAF is Integrity High.\nA:H - Racing ioctl/mmap against probe teardown oopses or panics via stale mappings or freed objects; a use-after-free also crashes when not fully exploited."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:53:17.224Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/26d9162213952927cd59c0d94b7e0e992b347bec"
        },
        {
          "url": "https://git.kernel.org/stable/c/24d28d15c0f7f7d4a1c229f8730314f0f8758810"
        },
        {
          "url": "https://git.kernel.org/stable/c/6729990df9e70623bf53f855b521ae71ca9cb278"
        },
        {
          "url": "https://git.kernel.org/stable/c/a0a7e2e177f2f18b9e7318a4c64ac44efd9ef22c"
        },
        {
          "url": "https://git.kernel.org/stable/c/19dbfe4d586aecfed121cb3fa62281761d9d341f"
        },
        {
          "url": "https://git.kernel.org/stable/c/79d09cfe90304ff4f195e47d569800f5e0f8b854"
        },
        {
          "url": "https://git.kernel.org/stable/c/2d1215a72159d00001e08dee162e27718934bee9"
        },
        {
          "url": "https://git.kernel.org/stable/c/eb197f7d60f00d0f5b1b3505dfc86a7e36045a3e"
        }
      ],
      "title": "drm: fix race between partial drm_dev_register() failure and ioctl",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89823",
    "datePublished": "2026-09-16T10:30:55.534Z",
    "dateReserved": "2026-09-11T19:38:34.768Z",
    "dateUpdated": "2026-10-19T08:53:17.224Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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