Vulnerability-Lookup

GHSA-W279-MJ9J-W893

Vulnerability from github – Published: 2026-05-27 15:33 – Updated: 2026-05-27 15:33

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-46065"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-27T14:17:27Z",
    "severity": null
  },
  "details": "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.",
  "id": "GHSA-w279-mj9j-w893",
  "modified": "2026-05-27T15:33:23Z",
  "published": "2026-05-27T15:33:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46065"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/25c2b77bc463f29ee71a54b883548baf9386a0db"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2a40f8bc9bb713329f1c35ffc199ee961a7135b0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2b53d3a52e8e5403a4f4fb57ac6cad3fd2cb1066"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9ded47ad003f09a94b6a710b5c47f4aa5ceb7429"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a0aafb421dd15e935d81543152617f2742cefa70"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-46065 (GCVE-0-2026-46065)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:57 – Updated: 2026-05-27 12:57

Title

fbdev: defio: Disconnect deferred I/O from the lifetime of struct fb_info

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.

Severity

No CVSS data available.

Assigner

Linux

References

5 references

URL	Tags
https://git.kernel.org/stable/c/2a40f8bc9bb713329…
https://git.kernel.org/stable/c/2b53d3a52e8e5403a…
https://git.kernel.org/stable/c/25c2b77bc463f29ee…
https://git.kernel.org/stable/c/a0aafb421dd15e935…
https://git.kernel.org/stable/c/9ded47ad003f09a94…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 60b59beafba875aef6d378078bce0baf2287ae14 , < 2a40f8bc9bb713329f1c35ffc199ee961a7135b0 (git) Affected: 60b59beafba875aef6d378078bce0baf2287ae14 , < 2b53d3a52e8e5403a4f4fb57ac6cad3fd2cb1066 (git) Affected: 60b59beafba875aef6d378078bce0baf2287ae14 , < 25c2b77bc463f29ee71a54b883548baf9386a0db (git) Affected: 60b59beafba875aef6d378078bce0baf2287ae14 , < a0aafb421dd15e935d81543152617f2742cefa70 (git) Affected: 60b59beafba875aef6d378078bce0baf2287ae14 , < 9ded47ad003f09a94b6a710b5c47f4aa5ceb7429 (git)
Linux	Linux	Affected: 2.6.22 Unaffected: 0 , < 2.6.22 (semver) Unaffected: 6.6.140 , ≤ 6.6.* (semver) Unaffected: 6.12.88 , ≤ 6.12.* (semver) Unaffected: 6.18.30 , ≤ 6.18.* (semver) Unaffected: 7.0.4 , ≤ 7.0.* (semver) Unaffected: 7.1-rc1 , ≤ * (original_commit_for_fix)

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JSON

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{
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      "affected": [
        {
          "defaultStatus": "unaffected",
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          "programFiles": [
            "drivers/video/fbdev/core/fb_defio.c",
            "include/linux/fb.h"
          ],
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          "vendor": "Linux",
          "versions": [
            {
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        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/video/fbdev/core/fb_defio.c",
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          ],
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.22"
            },
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              "status": "unaffected",
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              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.12.88",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.30",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
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          "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."
        }
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        {
          "url": "https://git.kernel.org/stable/c/9ded47ad003f09a94b6a710b5c47f4aa5ceb7429"
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      ],
      "title": "fbdev: defio: Disconnect deferred I/O from the lifetime of struct fb_info",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46065",
    "datePublished": "2026-05-27T12:57:32.968Z",
    "dateReserved": "2026-05-13T15:03:33.095Z",
    "dateUpdated": "2026-05-27T12:57:32.968Z",
    "state": "PUBLISHED"
  },
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-W279-MJ9J-W893

CVE-2026-46065 (GCVE-0-2026-46065)

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Sightings

Nomenclature