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

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-46065

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-46065

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "60b59beafba875aef6d378078bce0baf2287ae14",
        "lessThan": "4aab89603b637a2e441b38808c4f6fe7d1184df6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "60b59beafba875aef6d378078bce0baf2287ae14",
        "lessThan": "4fda0d6b45faad44926dd3e4f55f118d899b2e27",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "60b59beafba875aef6d378078bce0baf2287ae14",
        "lessThan": "2a40f8bc9bb713329f1c35ffc199ee961a7135b0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "60b59beafba875aef6d378078bce0baf2287ae14",
        "lessThan": "2b53d3a52e8e5403a4f4fb57ac6cad3fd2cb1066",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "60b59beafba875aef6d378078bce0baf2287ae14",
        "lessThan": "25c2b77bc463f29ee71a54b883548baf9386a0db",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "60b59beafba875aef6d378078bce0baf2287ae14",
        "lessThan": "a0aafb421dd15e935d81543152617f2742cefa70",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "60b59beafba875aef6d378078bce0baf2287ae14",
        "lessThan": "9ded47ad003f09a94b6a710b5c47f4aa5ceb7429",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/video/fbdev/core/fb_defio.c",
      "include/linux/fb.h"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.22"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.22",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.210",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.176",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.140",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.88",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.30",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/video/fbdev/core/fb_defio.c",
      "include/linux/fb.h"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-46065

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40112 · Revision 1
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Publisher date
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