{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-68255", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.377Z", "datePublished": "2026-08-10T12:01:24.835Z", "dateUpdated": "2026-08-23T12:46:13.247Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-23T12:46:13.247Z" }, "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->size field, never against the fixed-size resp->edid\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": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.7, "baseSeverity": "HIGH" }, "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->size, 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's 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->edid array, reading far beyond the kmalloc'd 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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/gpu/drm/virtio/virtgpu_vq.c" ], "versions": [ { "version": "b4b01b4995fb15b55a2d067eb405917f5ab32709", "lessThan": "65ce911f341ad8ff0c08922eff5bb6db75666eb0", "status": "affected", "versionType": "git" }, { "version": "b4b01b4995fb15b55a2d067eb405917f5ab32709", "lessThan": "64bedd2758eccbc74d39f7006a7ec16fa39dc901", "status": "affected", "versionType": "git" }, { "version": "b4b01b4995fb15b55a2d067eb405917f5ab32709", "lessThan": "3f506a85a905b080cadc029a1651a310479090a6", "status": "affected", "versionType": "git" }, { "version": "b4b01b4995fb15b55a2d067eb405917f5ab32709", "lessThan": "9fc2a017c5d597937e0c28b9a9669844aa796c42", "status": "affected", "versionType": "git" }, { "version": "b4b01b4995fb15b55a2d067eb405917f5ab32709", "lessThan": "2757e6e803092cf0aeaf4b735e16b5d3bdc705c5", "status": "affected", "versionType": "git" }, { "version": "b4b01b4995fb15b55a2d067eb405917f5ab32709", "lessThan": "35be0e2c6862abcd5e5f5445261f1fd910d4a9b4", "status": "affected", "versionType": "git" }, { "version": "b4b01b4995fb15b55a2d067eb405917f5ab32709", "lessThan": "375c1934ef0196d3b6d3a1eae3232bef8dae7bf7", "status": "affected", "versionType": "git" }, { "version": "b4b01b4995fb15b55a2d067eb405917f5ab32709", "lessThan": "4e1a53892ba7f8a3e1da6bfc53c83ae7c812dccd", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/gpu/drm/virtio/virtgpu_vq.c" ], "versions": [ { "version": "5.0", "status": "affected" }, { "version": "0", "lessThan": "5.0", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.266", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.217", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "5.10.266" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "5.15.217" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.1.183" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.6.148" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.12.101" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "6.18.42" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "7.1.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0", "versionEndExcluding": "7.2" } ] } ] } ], "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" } } } }