310 lines
17 KiB
JSON
310 lines
17 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-64546",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-07-19T15:36:31.795Z",
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"datePublished": "2026-07-27T20:10:37.217Z",
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"dateUpdated": "2026-10-19T20:48:40.025Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-17T04:57:23.260Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/edid: fix OOB read in drm_parse_tiled_block()\n\ndrm_parse_tiled_block() casts the DisplayID block to a\nstruct displayid_tiled_block and reads the full fixed layout up to\ntile->topology_id[7] without checking block->num_bytes. The DisplayID\niterator only validates the declared payload length, so a crafted EDID\ncan advertise a tiled-display block (tag DATA_BLOCK_TILED_DISPLAY, or\nDATA_BLOCK_2_TILED_DISPLAY_TOPOLOGY for v2.0) with a small num_bytes at\nthe end of a DisplayID extension. The read then runs past the end of the\nexact-sized kmemdup()'d EDID allocation, a heap out-of-bounds read.\n\nReject blocks shorter than the spec's 22-byte tiled payload before\nreading the fixed struct, as drm_parse_vesa_mso_data() already does.\n\n BUG: KASAN: slab-out-of-bounds in drm_edid_connector_update\n Read of size 2 at addr ffff888010077700 by task exploit/147\n dump_stack_lvl (lib/dump_stack.c:94 ...)\n print_report (mm/kasan/report.c:378 ...)\n kasan_report (mm/kasan/report.c:595)\n drm_edid_connector_update (drivers/gpu/drm/drm_edid.c:7581)\n bochs_connector_helper_get_modes (drivers/gpu/drm/tiny/bochs.c:574)\n drm_helper_probe_single_connector_modes (drivers/gpu/drm/drm_probe_helper.c:426)\n status_store (drivers/gpu/drm/drm_sysfs.c:219)\n ...\n vfs_write (fs/read_write.c:595 fs/read_write.c:688)\n ksys_write (fs/read_write.c:740)"
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
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"baseScore": 7.1,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The crafted EDID reaches the parser through a local device node — an unprivileged DRM client supplying a raw EDID buffer via the exynos vidi `DRM_AUTH` ioctl, or root via the connector's debugfs `edid_override` plus a sysfs re-probe. No network path exists, and local ioctl delivery is the lowest-friction vector (a physically attached malicious monitor/dock is an additional, equally automatic route).\nAC:L - The attacker fully controls the EDID bytes and only needs to place a tiled-display DisplayID block with a small `num_bytes` at the tail of the last extension block; `drm_edid_valid()` checks nothing but the header and checksums, which the attacker computes. No race and no memory-layout precondition is needed to trigger the read.\nPR:L - Handing an arbitrary EDID to `drm_edid_connector_update()` via `DRM_IOCTL_EXYNOS_VIDI_CONNECTION` requires only an authenticated DRM client (`DRM_AUTH`), i.e. an ordinary logged-in user with access to /dev/dri — no CAP_SYS_ADMIN and no root.\nUI:N - The attacker drives the connector probe itself through the ioctl, and on the hotplug path the EDID is read and parsed automatically by the kernel. No victim action is involved.\nS:U - The out-of-bounds read stays within the kernel's own heap and the impact is confined to the kernel security authority; no hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - Up to ~21 bytes of adjacent slab memory are read past the exact-size EDID allocation, and eight of those bytes are persisted into the connector's tile fields and handed back to userspace in the TILE property blob via `DRM_IOCTL_MODE_GETPROPBLOB`, giving a repeatable heap-content leak usable to defeat KASLR or recover neighbouring object data.\nI:N - The defect is purely a read; `drm_mode_create_tile_group()` copies the OOB source into a properly sized destination, so no out-of-bounds write or control-flow corruption occurs.\nA:H - The read runs past the end of the slab object and, for exact-fit allocations at a slab boundary, can touch unmapped memory; on KASAN or panic_on_warn kernels it is an immediate fatal report, and the resulting garbage tile geometry is propagated to the modesetting path."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/gpu/drm/drm_edid.c"
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],
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/gpu/drm/drm_edid.c"
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],
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{
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"version": "3.19",
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"status": "affected"
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"version": "0",
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"lessThan": "3.19",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.261",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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},
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{
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"version": "5.15.212",
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"lessThanOrEqual": "5.15.*",
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},
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"version": "6.1.178",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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"version": "6.6.145",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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},
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{
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"version": "6.12.97",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.40",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1.5",
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"lessThanOrEqual": "7.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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"cpeApplicability": [
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},
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{
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"url": "https://git.kernel.org/stable/c/157727131ce8a52d8d9bc676c372ef82db6436c4"
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},
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{
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"url": "https://git.kernel.org/stable/c/bfa05d89dc3ca3fb1a9099ef5185549a5ec8490d"
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},
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{
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"url": "https://git.kernel.org/stable/c/4f5484d25f85ad6c989bad5f6a43450cecfcfd28"
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},
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{
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"url": "https://git.kernel.org/stable/c/9cc0f8e63e8c34cf43def35cbd305ba711181a1f"
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{
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"url": "https://git.kernel.org/stable/c/4137e1ecec9c8cb6c4fcee28ffabbbc7409eb7fb"
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},
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{
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"url": "https://git.kernel.org/stable/c/faaa1e1155833e7d4ce7e3cfaf64c0d636b190db"
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}
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],
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"title": "drm/edid: fix OOB read in drm_parse_tiled_block()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-64546",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T15:42:17.796608Z"
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}
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-125",
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"description": "CWE-125 Out-of-bounds Read"
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}
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]
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-19T20:48:40.025Z"
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}
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}
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]
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}
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} |