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

Vulnerability from cvelistv5 – Published: 2026-05-27 12:57 – Updated: 2026-06-19 11:59
VLAI
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
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 60b59beafba875aef6d378078bce0baf2287ae14 , < 4aab89603b637a2e441b38808c4f6fe7d1184df6 (git)
Affected: 60b59beafba875aef6d378078bce0baf2287ae14 , < 4fda0d6b45faad44926dd3e4f55f118d899b2e27 (git)
Affected: 60b59beafba875aef6d378078bce0baf2287ae14 , < 2a40f8bc9bb713329f1c35ffc199ee961a7135b0 (git)
Affected: 60b59beafba875aef6d378078bce0baf2287ae14 , < 2b53d3a52e8e5403a4f4fb57ac6cad3fd2cb1066 (git)
Affected: 60b59beafba875aef6d378078bce0baf2287ae14 , < 25c2b77bc463f29ee71a54b883548baf9386a0db (git)
Affected: 60b59beafba875aef6d378078bce0baf2287ae14 , < a0aafb421dd15e935d81543152617f2742cefa70 (git)
Affected: 60b59beafba875aef6d378078bce0baf2287ae14 , < 9ded47ad003f09a94b6a710b5c47f4aa5ceb7429 (git)
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Linux Linux Affected: 2.6.22
Unaffected: 0 , < 2.6.22 (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (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 , ≤ * (original_commit_for_fix)
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-02T19:16:31+00:00",
      "cve": "CVE-2026-46065",
      "id": "CVE-2026-46065",
      "initial_release_date": "2026-05-27T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: fbdev: defio: Disconnect deferred I/O from the lifetime of struct fb_info",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46065.json",
      "version": "3"
    }
  }
}



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