drm/edid: fix OOB read in drm_parse_tiled_block()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64546
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-27 21:17:07 UTC
Updated2026-07-30 06:25:58 UTC
DescriptionIn 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)

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

EPSS: 0.001260000 probability, percentile 0.026350000 (date 2026-08-01)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
3.1CNADECLARED7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 40d9b043a89e2301e1f97ade055a73ecc28e9afe c4ab04ca1bbf87eefa9fec5c80e1880450d2e7c0 git Not specified
CNA Linux Linux affected 40d9b043a89e2301e1f97ade055a73ecc28e9afe 9acd5c1ddc17ca4c5ffa0c373e3fdf480506e061 git Not specified
CNA Linux Linux affected 40d9b043a89e2301e1f97ade055a73ecc28e9afe 157727131ce8a52d8d9bc676c372ef82db6436c4 git Not specified
CNA Linux Linux affected 40d9b043a89e2301e1f97ade055a73ecc28e9afe bfa05d89dc3ca3fb1a9099ef5185549a5ec8490d git Not specified
CNA Linux Linux affected 40d9b043a89e2301e1f97ade055a73ecc28e9afe 4f5484d25f85ad6c989bad5f6a43450cecfcfd28 git Not specified
CNA Linux Linux affected 40d9b043a89e2301e1f97ade055a73ecc28e9afe 9cc0f8e63e8c34cf43def35cbd305ba711181a1f git Not specified
CNA Linux Linux affected 40d9b043a89e2301e1f97ade055a73ecc28e9afe 4137e1ecec9c8cb6c4fcee28ffabbbc7409eb7fb git Not specified
CNA Linux Linux affected 40d9b043a89e2301e1f97ade055a73ecc28e9afe faaa1e1155833e7d4ce7e3cfaf64c0d636b190db git Not specified
CNA Linux Linux affected 3.19 Not specified
CNA Linux Linux unaffected 3.19 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/c4ab04ca1bbf87eefa9fec5c80e1880450d2e7c0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4f5484d25f85ad6c989bad5f6a43450cecfcfd28 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9acd5c1ddc17ca4c5ffa0c373e3fdf480506e061 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9cc0f8e63e8c34cf43def35cbd305ba711181a1f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/157727131ce8a52d8d9bc676c372ef82db6436c4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4137e1ecec9c8cb6c4fcee28ffabbbc7409eb7fb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bfa05d89dc3ca3fb1a9099ef5185549a5ec8490d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/faaa1e1155833e7d4ce7e3cfaf64c0d636b190db 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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