CVE-2026-64546

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)

Affected Software

VendorProductVersion RangeStatus
LinuxLinux40d9b043a89e2301e1f97ade055a73ecc28e9afe < c4ab04ca1bbf87eefa9fec5c80e1880450d2e7c0affected
LinuxLinux40d9b043a89e2301e1f97ade055a73ecc28e9afe < 9acd5c1ddc17ca4c5ffa0c373e3fdf480506e061affected
LinuxLinux40d9b043a89e2301e1f97ade055a73ecc28e9afe < 157727131ce8a52d8d9bc676c372ef82db6436c4affected
LinuxLinux40d9b043a89e2301e1f97ade055a73ecc28e9afe < bfa05d89dc3ca3fb1a9099ef5185549a5ec8490daffected
LinuxLinux40d9b043a89e2301e1f97ade055a73ecc28e9afe < 4f5484d25f85ad6c989bad5f6a43450cecfcfd28affected
LinuxLinux40d9b043a89e2301e1f97ade055a73ecc28e9afe < 9cc0f8e63e8c34cf43def35cbd305ba711181a1faffected
LinuxLinux40d9b043a89e2301e1f97ade055a73ecc28e9afe < 4137e1ecec9c8cb6c4fcee28ffabbbc7409eb7fbaffected
LinuxLinux40d9b043a89e2301e1f97ade055a73ecc28e9afe < faaa1e1155833e7d4ce7e3cfaf64c0d636b190dbaffected
LinuxLinux3.19affected
LinuxLinux0 < 3.19unaffected
LinuxLinux5.10.261 <= 5.10.*unaffected
LinuxLinux5.15.212 <= 5.15.*unaffected
LinuxLinux6.1.178 <= 6.1.*unaffected
LinuxLinux6.6.145 <= 6.6.*unaffected
LinuxLinux6.12.97 <= 6.12.*unaffected
LinuxLinux6.18.40 <= 6.18.*unaffected
LinuxLinux7.1.5 <= 7.1.*unaffected
LinuxLinux7.2-rc1 <= *unaffected

Weaknesses

References