CVE-2026-64546 (GCVE-0-2026-64546)
Vulnerability from cvelistv5
Published
2026-07-27 20:10
Modified
2026-08-17 04:57
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
drm/edid: fix OOB read in drm_parse_tiled_block()
drm_parse_tiled_block() casts the DisplayID block to a
struct displayid_tiled_block and reads the full fixed layout up to
tile->topology_id[7] without checking block->num_bytes. The DisplayID
iterator only validates the declared payload length, so a crafted EDID
can advertise a tiled-display block (tag DATA_BLOCK_TILED_DISPLAY, or
DATA_BLOCK_2_TILED_DISPLAY_TOPOLOGY for v2.0) with a small num_bytes at
the end of a DisplayID extension. The read then runs past the end of the
exact-sized kmemdup()'d EDID allocation, a heap out-of-bounds read.
Reject blocks shorter than the spec's 22-byte tiled payload before
reading the fixed struct, as drm_parse_vesa_mso_data() already does.
BUG: KASAN: slab-out-of-bounds in drm_edid_connector_update
Read of size 2 at addr ffff888010077700 by task exploit/147
dump_stack_lvl (lib/dump_stack.c:94 ...)
print_report (mm/kasan/report.c:378 ...)
kasan_report (mm/kasan/report.c:595)
drm_edid_connector_update (drivers/gpu/drm/drm_edid.c:7581)
bochs_connector_helper_get_modes (drivers/gpu/drm/tiny/bochs.c:574)
drm_helper_probe_single_connector_modes (drivers/gpu/drm/drm_probe_helper.c:426)
status_store (drivers/gpu/drm/drm_sysfs.c:219)
...
vfs_write (fs/read_write.c:595 fs/read_write.c:688)
ksys_write (fs/read_write.c:740)
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 40d9b043a89e2301e1f97ade055a73ecc28e9afe Version: 40d9b043a89e2301e1f97ade055a73ecc28e9afe Version: 40d9b043a89e2301e1f97ade055a73ecc28e9afe Version: 40d9b043a89e2301e1f97ade055a73ecc28e9afe Version: 40d9b043a89e2301e1f97ade055a73ecc28e9afe Version: 40d9b043a89e2301e1f97ade055a73ecc28e9afe Version: 40d9b043a89e2301e1f97ade055a73ecc28e9afe Version: 40d9b043a89e2301e1f97ade055a73ecc28e9afe |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/gpu/drm/drm_edid.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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},
{
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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"status": "affected",
"version": "3.19"
},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "5.10.261",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
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}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"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-\u003etopology_id[7] without checking block-\u003enum_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()\u0027d EDID allocation, a heap out-of-bounds read.\n\nReject blocks shorter than the spec\u0027s 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)"
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.1,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The crafted EDID reaches the parser through a local device node \u2014 an unprivileged DRM client supplying a raw EDID buffer via the exynos vidi `DRM_AUTH` ioctl, or root via the connector\u0027s 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 \u2014 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\u0027s 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\u0027s 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."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T04:57:23.260Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/c4ab04ca1bbf87eefa9fec5c80e1880450d2e7c0"
},
{
"url": "https://git.kernel.org/stable/c/9acd5c1ddc17ca4c5ffa0c373e3fdf480506e061"
},
{
"url": "https://git.kernel.org/stable/c/157727131ce8a52d8d9bc676c372ef82db6436c4"
},
{
"url": "https://git.kernel.org/stable/c/bfa05d89dc3ca3fb1a9099ef5185549a5ec8490d"
},
{
"url": "https://git.kernel.org/stable/c/4f5484d25f85ad6c989bad5f6a43450cecfcfd28"
},
{
"url": "https://git.kernel.org/stable/c/9cc0f8e63e8c34cf43def35cbd305ba711181a1f"
},
{
"url": "https://git.kernel.org/stable/c/4137e1ecec9c8cb6c4fcee28ffabbbc7409eb7fb"
},
{
"url": "https://git.kernel.org/stable/c/faaa1e1155833e7d4ce7e3cfaf64c0d636b190db"
}
],
"title": "drm/edid: fix OOB read in drm_parse_tiled_block()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-64546",
"datePublished": "2026-07-27T20:10:37.217Z",
"dateReserved": "2026-07-19T15:36:31.795Z",
"dateUpdated": "2026-08-17T04:57:23.260Z",
"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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