{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64546",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64546"
  ],
  "published": "2026-07-27T20:10:44Z",
  "summary": "drm/edid: fix OOB read in drm_parse_tiled_block()",
  "details": "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->topology_id[7] without checking block->num_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()'d EDID allocation, a heap out-of-bounds read.\n\nReject blocks shorter than the spec's 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)",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H"
    }
  ],
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-64546"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c4ab04ca1bbf87eefa9fec5c80e1880450d2e7c0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9acd5c1ddc17ca4c5ffa0c373e3fdf480506e061"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/157727131ce8a52d8d9bc676c372ef82db6436c4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bfa05d89dc3ca3fb1a9099ef5185549a5ec8490d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4f5484d25f85ad6c989bad5f6a43450cecfcfd28"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9cc0f8e63e8c34cf43def35cbd305ba711181a1f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4137e1ecec9c8cb6c4fcee28ffabbbc7409eb7fb"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/faaa1e1155833e7d4ce7e3cfaf64c0d636b190db"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:24:08Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.1,
      "cvss_v3_severity": "High",
      "scenario": "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's 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's 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's 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."
    }
  }
}