CVE-2026-64546

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)