CVE-2026-46065 (GCVE-0-2026-46065)
Vulnerability from cvelistv5
Published
2026-05-27 12:57
Modified
2026-08-05 12:29
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: 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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 60b59beafba875aef6d378078bce0baf2287ae14
Version: 60b59beafba875aef6d378078bce0baf2287ae14
Version: 60b59beafba875aef6d378078bce0baf2287ae14
Version: 60b59beafba875aef6d378078bce0baf2287ae14
Version: 60b59beafba875aef6d378078bce0baf2287ae14
Version: 60b59beafba875aef6d378078bce0baf2287ae14
Version: 60b59beafba875aef6d378078bce0baf2287ae14
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/video/fbdev/core/fb_defio.c",
            "include/linux/fb.h"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/video/fbdev/core/fb_defio.c",
            "include/linux/fb.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "5.15.210",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.176",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.140",
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            {
              "lessThanOrEqual": "6.12.*",
              "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",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.210",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.176",
                  "versionStartIncluding": "2.6.22",
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable fault handlers are reached by mmap\u0027ing /dev/fbN and accessing the mapping \u2014 a local operation requiring no network. Device removal (the precondition) can be non-physical (VM host-driven removal, sysfs unbind, module unload), so Local is the most severe defensible vector over Physical.\nAC:L - Once the device is removed while a mapping is active, any access deterministically hits the freed defio state/video pages \u2014 no race must be won to trigger it. In a kiosk/embedded scenario with a removable display the attacker controls both the mapping and the removal, and heap reclaim is attacker-influenced.\nPR:L - Exploitation requires only a local user with access to the framebuffer device, which is granted to the logged-in/console user, video-group members, Android apps, and is often world-accessible on embedded/kiosk systems. No root or init-namespace privilege is needed.\nUI:N - The attacker performs all steps themselves \u2014 map the framebuffer, cause/await removal, then access the mapping \u2014 with no separate victim action required.\nS:U - The use-after-free corrupts kernel memory within the same security authority; even in the VM-framebuffer case the impact stays inside the guest kernel and does not cross into the hypervisor.\nC:H - The fault handler returns freed-and-reclaimed video pages and the freed pagerefs array to userspace, allowing disclosure of arbitrary reallocated kernel/user memory \u2014 a use-after-free read primitive.\nI:H - The write-fault path writes a page pointer and offset into the kvfree\u0027d pagerefs array and exposes freed/reallocated pages for writing, giving a use-after-free write primitive usable for control-flow hijacking via heap spraying.\nA:H - Accessing the mapping after teardown uses a destroyed mutex, freed pagerefs, and hits BUG_ON(!info-\u003efbdefio-\u003emapping), reliably causing an oops/panic; any use-after-free crashes the kernel."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:29:27.785Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4aab89603b637a2e441b38808c4f6fe7d1184df6"
        },
        {
          "url": "https://git.kernel.org/stable/c/4fda0d6b45faad44926dd3e4f55f118d899b2e27"
        },
        {
          "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": "2026-08-05T12:29:27.785Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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