CVE-2026-46065 (GCVE-0-2026-46065)
Vulnerability from cvelistv5
Published
2026-05-27 12:57
Modified
2026-06-14 17:51
Summary
In the Linux kernel, the following vulnerability has been resolved: fbdev: defio: Disconnect deferred I/O from the lifetime of struct fb_info Hold state of deferred I/O in struct fb_deferred_io_state. Allocate an instance as part of initializing deferred I/O and remove it only after the final mapping has been closed. If the fb_info and the contained deferred I/O meanwhile goes away, clear struct fb_deferred_io_state.info to invalidate the mapping. Any access will then result in a SIGBUS signal. Fixes a long-standing problem, where a device hot-unplug happens while user space still has an active mapping of the graphics memory. The hot- unplug frees the instance of struct fb_info. Accessing the memory will operate on undefined state.
Impacted products
Vendor Product Version
Linux Linux Version: 60b59beafba875aef6d378078bce0baf2287ae14
Version: 60b59beafba875aef6d378078bce0baf2287ae14
Version: 60b59beafba875aef6d378078bce0baf2287ae14
Version: 60b59beafba875aef6d378078bce0baf2287ae14
Version: 60b59beafba875aef6d378078bce0baf2287ae14
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{
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            "drivers/video/fbdev/core/fb_defio.c",
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            "include/linux/fb.h"
          ],
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          "vendor": "Linux",
          "versions": [
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              "version": "2.6.22"
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              "versionType": "semver"
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            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbdev: defio: Disconnect deferred I/O from the lifetime of struct fb_info\n\nHold state of deferred I/O in struct fb_deferred_io_state. Allocate an\ninstance as part of initializing deferred I/O and remove it only after\nthe final mapping has been closed. If the fb_info and the contained\ndeferred I/O meanwhile goes away, clear struct fb_deferred_io_state.info\nto invalidate the mapping. Any access will then result in a SIGBUS\nsignal.\n\nFixes a long-standing problem, where a device hot-unplug happens while\nuser space still has an active mapping of the graphics memory. The hot-\nunplug frees the instance of struct fb_info. Accessing the memory will\noperate on undefined state."
        }
      ],
      "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"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-14T17:51:47.030Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2a40f8bc9bb713329f1c35ffc199ee961a7135b0"
        },
        {
          "url": "https://git.kernel.org/stable/c/2b53d3a52e8e5403a4f4fb57ac6cad3fd2cb1066"
        },
        {
          "url": "https://git.kernel.org/stable/c/25c2b77bc463f29ee71a54b883548baf9386a0db"
        },
        {
          "url": "https://git.kernel.org/stable/c/a0aafb421dd15e935d81543152617f2742cefa70"
        },
        {
          "url": "https://git.kernel.org/stable/c/9ded47ad003f09a94b6a710b5c47f4aa5ceb7429"
        }
      ],
      "title": "fbdev: defio: Disconnect deferred I/O from the lifetime of struct fb_info",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46065",
    "datePublished": "2026-05-27T12:57:32.968Z",
    "dateReserved": "2026-05-13T15:03:33.095Z",
    "dateUpdated": "2026-06-14T17:51:47.030Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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