CVE-2026-68255 (GCVE-0-2026-68255)
Vulnerability from cvelistv5
Published
2026-08-10 12:01
Modified
2026-08-23 12:46
Severity ?
VLAI Severity ?
EPSS score ?
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: b4b01b4995fb15b55a2d067eb405917f5ab32709 Version: b4b01b4995fb15b55a2d067eb405917f5ab32709 Version: b4b01b4995fb15b55a2d067eb405917f5ab32709 Version: b4b01b4995fb15b55a2d067eb405917f5ab32709 Version: b4b01b4995fb15b55a2d067eb405917f5ab32709 Version: b4b01b4995fb15b55a2d067eb405917f5ab32709 Version: b4b01b4995fb15b55a2d067eb405917f5ab32709 Version: b4b01b4995fb15b55a2d067eb405917f5ab32709 |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/gpu/drm/virtio/virtgpu_vq.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "65ce911f341ad8ff0c08922eff5bb6db75666eb0",
"status": "affected",
"version": "b4b01b4995fb15b55a2d067eb405917f5ab32709",
"versionType": "git"
},
{
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"status": "affected",
"version": "b4b01b4995fb15b55a2d067eb405917f5ab32709",
"versionType": "git"
},
{
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"status": "affected",
"version": "b4b01b4995fb15b55a2d067eb405917f5ab32709",
"versionType": "git"
},
{
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"status": "affected",
"version": "b4b01b4995fb15b55a2d067eb405917f5ab32709",
"versionType": "git"
},
{
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"status": "affected",
"version": "b4b01b4995fb15b55a2d067eb405917f5ab32709",
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{
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"versionType": "git"
},
{
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"status": "affected",
"version": "b4b01b4995fb15b55a2d067eb405917f5ab32709",
"versionType": "git"
},
{
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"status": "affected",
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"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/gpu/drm/virtio/virtgpu_vq.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.0"
},
{
"lessThan": "5.0",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.266",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.217",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.183",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.148",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.101",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.42",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.266",
"versionStartIncluding": "5.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.217",
"versionStartIncluding": "5.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.183",
"versionStartIncluding": "5.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.148",
"versionStartIncluding": "5.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.101",
"versionStartIncluding": "5.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.42",
"versionStartIncluding": "5.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.6",
"versionStartIncluding": "5.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "5.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"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."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.7,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"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."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-23T12:46:13.247Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/65ce911f341ad8ff0c08922eff5bb6db75666eb0"
},
{
"url": "https://git.kernel.org/stable/c/64bedd2758eccbc74d39f7006a7ec16fa39dc901"
},
{
"url": "https://git.kernel.org/stable/c/3f506a85a905b080cadc029a1651a310479090a6"
},
{
"url": "https://git.kernel.org/stable/c/9fc2a017c5d597937e0c28b9a9669844aa796c42"
},
{
"url": "https://git.kernel.org/stable/c/2757e6e803092cf0aeaf4b735e16b5d3bdc705c5"
},
{
"url": "https://git.kernel.org/stable/c/35be0e2c6862abcd5e5f5445261f1fd910d4a9b4"
},
{
"url": "https://git.kernel.org/stable/c/375c1934ef0196d3b6d3a1eae3232bef8dae7bf7"
},
{
"url": "https://git.kernel.org/stable/c/4e1a53892ba7f8a3e1da6bfc53c83ae7c812dccd"
}
],
"title": "drm/virtio: bound EDID block reads to the response buffer",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-68255",
"datePublished": "2026-08-10T12:01:24.835Z",
"dateReserved": "2026-07-30T09:28:09.377Z",
"dateUpdated": "2026-08-23T12:46:13.247Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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