CVE-2026-68255 (GCVE-0-2026-68255)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:01 – Updated: 2026-08-19 16:32
VLAI
Title
drm/virtio: bound EDID block reads to the response buffer
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/virtio: bound EDID block reads to the response buffer virtio_get_edid_block() validates the read offset only against the device-supplied resp->size field, never against the fixed-size resp->edid array. The EDID block index is driven by the device-supplied extension count, so a malicious virtio-gpu backend can advertise a large size together with a high block count and read far past the array into adjacent kernel memory, which is then surfaced in the parsed EDID (an out-of-bounds read / info leak). Also reject any read whose end exceeds the size of the edid array. Conforming EDID responses stay within the array and are unaffected.
Severity
7.7 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b4b01b4995fb15b55a2d067eb405917f5ab32709 , < 3f506a85a905b080cadc029a1651a310479090a6 (git)
Affected: b4b01b4995fb15b55a2d067eb405917f5ab32709 , < 9fc2a017c5d597937e0c28b9a9669844aa796c42 (git)
Affected: b4b01b4995fb15b55a2d067eb405917f5ab32709 , < 2757e6e803092cf0aeaf4b735e16b5d3bdc705c5 (git)
Affected: b4b01b4995fb15b55a2d067eb405917f5ab32709 , < 35be0e2c6862abcd5e5f5445261f1fd910d4a9b4 (git)
Affected: b4b01b4995fb15b55a2d067eb405917f5ab32709 , < 375c1934ef0196d3b6d3a1eae3232bef8dae7bf7 (git)
Affected: b4b01b4995fb15b55a2d067eb405917f5ab32709 , < 4e1a53892ba7f8a3e1da6bfc53c83ae7c812dccd (git)
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Linux Linux Affected: 5.0
Unaffected: 0 , < 5.0 (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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              "versionType": "original_commit_for_fix"
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/virtio: bound EDID block reads to the response buffer\n\nvirtio_get_edid_block() validates the read offset only against the\ndevice-supplied resp-\u003esize field, never against the fixed-size resp-\u003eedid\narray. The EDID block index is driven by the device-supplied extension\ncount, so a malicious virtio-gpu backend can advertise a large size\ntogether with a high block count and read far past the array into adjacent\nkernel memory, which is then surfaced in the parsed EDID (an out-of-bounds\nread / info leak).\n\nAlso reject any read whose end exceeds the size of the edid array.\nConforming EDID responses stay within the array and are unaffected."
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            "version": "3.1"
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              "value": "AV:L - The attacker is a malicious or compromised virtio-gpu backend (host/hypervisor device emulation or a vhost-user device process) supplying crafted EDID responses over the virtqueue; this is device-to-guest-kernel access, not remote network access.\nAC:L - The device fully controls resp-\u003esize, the EDID extension count and the timing of the read by raising VIRTIO_GPU_EVENT_DISPLAY config-change interrupts, so it can trigger the out-of-bounds read reliably and repeatedly with no conditions outside its control.\nPR:N - No guest credentials are needed at all: the vulnerable path runs in the virtio-gpu probe and the config-changed workqueue in kernel context, driven purely by device responses.\nUI:N - EDID re-reads are initiated automatically at probe and on device-raised display events; no guest user has to open, mount or interact with anything.\nS:U - The out-of-bounds read and the resulting disclosure both occur within the guest kernel\u0027s own security authority; no IOMMU, VM or sandbox boundary is crossed by the impact itself.\nC:H - Block indices up to 255 give start offsets of ~32 KB past the 1024-byte resp-\u003eedid array, reading far beyond the kmalloc\u0027d response object into adjacent kernel heap memory, which is then surfaced as parsed EDID via the connector blob property and world-readable sysfs edid file, and hex-dumped for bad blocks.\nI:N - Destination buffers in _drm_do_get_edid() are allocated from the block count, so the flaw is strictly an over-read of the response buffer with no out-of-bounds write or kernel data modification.\nA:H - The memcpy can walk tens of kilobytes past the slab object into unmapped or guarded memory, causing an oops/panic (and an immediate BUG under KASAN/hardened builds), and the device can repeat it at will."
            }
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/4e1a53892ba7f8a3e1da6bfc53c83ae7c812dccd"
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    "cveId": "CVE-2026-68255",
    "datePublished": "2026-08-10T12:01:24.835Z",
    "dateReserved": "2026-07-30T09:28:09.377Z",
    "dateUpdated": "2026-08-19T16:32:26.120Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2026-68255",
      "date": "2026-08-20",
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-13T23:15:32+00:00",
      "cve": "CVE-2026-68255",
      "id": "CVE-2026-68255",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "92",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/virtio: bound EDID block reads to the response buffer",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68255.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-14T23:45:33Z",
      "cve": "CVE-2026-68255",
      "id": "CVE-2026-68255",
      "initial_release_date": "2026-08-14T17:15:13Z",
      "product_status:known_affected": "144",
      "product_status:known_not_affected": "152",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68255",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68255.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.