{"id":"CVE-2026-64546","state":"PUBLISHED","title":"drm/edid: fix OOB read in drm_parse_tiled_block()","description":"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)","publishedAt":"2026-07-27T20:10:37.217Z","updatedAt":"2026-10-19T20:48:40.025Z","severity":{"score":7.1,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"40d9b043a89e2301e1f97ade055a73ecc28e9afe","status":"affected","lessThan":"c4ab04ca1bbf87eefa9fec5c80e1880450d2e7c0","versionType":"git"},{"version":"40d9b043a89e2301e1f97ade055a73ecc28e9afe","status":"affected","lessThan":"9acd5c1ddc17ca4c5ffa0c373e3fdf480506e061","versionType":"git"},{"version":"40d9b043a89e2301e1f97ade055a73ecc28e9afe","status":"affected","lessThan":"157727131ce8a52d8d9bc676c372ef82db6436c4","versionType":"git"},{"version":"40d9b043a89e2301e1f97ade055a73ecc28e9afe","status":"affected","lessThan":"bfa05d89dc3ca3fb1a9099ef5185549a5ec8490d","versionType":"git"},{"version":"40d9b043a89e2301e1f97ade055a73ecc28e9afe","status":"affected","lessThan":"4f5484d25f85ad6c989bad5f6a43450cecfcfd28","versionType":"git"},{"version":"40d9b043a89e2301e1f97ade055a73ecc28e9afe","status":"affected","lessThan":"9cc0f8e63e8c34cf43def35cbd305ba711181a1f","versionType":"git"},{"version":"40d9b043a89e2301e1f97ade055a73ecc28e9afe","status":"affected","lessThan":"4137e1ecec9c8cb6c4fcee28ffabbbc7409eb7fb","versionType":"git"},{"version":"40d9b043a89e2301e1f97ade055a73ecc28e9afe","status":"affected","lessThan":"faaa1e1155833e7d4ce7e3cfaf64c0d636b190db","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/drm_edid.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.19","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/drm_edid.c"]}],"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"],"weaknesses":["CWE-125"],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64546.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64546","state":"PUBLISHED","datePublished":"2026-07-27T20:10:37.217Z","dateUpdated":"2026-10-19T20:48:40.025Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T15:36:31.795Z"},"containers":{"cna":{"title":"drm/edid: fix OOB read in drm_parse_tiled_block()","descriptions":[{"lang":"en","value":"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)"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"40d9b043a89e2301e1f97ade055a73ecc28e9afe","status":"affected","lessThan":"c4ab04ca1bbf87eefa9fec5c80e1880450d2e7c0","versionType":"git"},{"version":"40d9b043a89e2301e1f97ade055a73ecc28e9afe","status":"affected","lessThan":"9acd5c1ddc17ca4c5ffa0c373e3fdf480506e061","versionType":"git"},{"version":"40d9b043a89e2301e1f97ade055a73ecc28e9afe","status":"affected","lessThan":"157727131ce8a52d8d9bc676c372ef82db6436c4","versionType":"git"},{"version":"40d9b043a89e2301e1f97ade055a73ecc28e9afe","status":"affected","lessThan":"bfa05d89dc3ca3fb1a9099ef5185549a5ec8490d","versionType":"git"},{"version":"40d9b043a89e2301e1f97ade055a73ecc28e9afe","status":"affected","lessThan":"4f5484d25f85ad6c989bad5f6a43450cecfcfd28","versionType":"git"},{"version":"40d9b043a89e2301e1f97ade055a73ecc28e9afe","status":"affected","lessThan":"9cc0f8e63e8c34cf43def35cbd305ba711181a1f","versionType":"git"},{"version":"40d9b043a89e2301e1f97ade055a73ecc28e9afe","status":"affected","lessThan":"4137e1ecec9c8cb6c4fcee28ffabbbc7409eb7fb","versionType":"git"},{"version":"40d9b043a89e2301e1f97ade055a73ecc28e9afe","status":"affected","lessThan":"faaa1e1155833e7d4ce7e3cfaf64c0d636b190db","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/drm_edid.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.19","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/drm_edid.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/c4ab04ca1bbf87eefa9fec5c80e1880450d2e7c0"},{"url":"https://git.kernel.org/stable/c/9acd5c1ddc17ca4c5ffa0c373e3fdf480506e061"},{"url":"https://git.kernel.org/stable/c/157727131ce8a52d8d9bc676c372ef82db6436c4"},{"url":"https://git.kernel.org/stable/c/bfa05d89dc3ca3fb1a9099ef5185549a5ec8490d"},{"url":"https://git.kernel.org/stable/c/4f5484d25f85ad6c989bad5f6a43450cecfcfd28"},{"url":"https://git.kernel.org/stable/c/9cc0f8e63e8c34cf43def35cbd305ba711181a1f"},{"url":"https://git.kernel.org/stable/c/4137e1ecec9c8cb6c4fcee28ffabbbc7409eb7fb"},{"url":"https://git.kernel.org/stable/c/faaa1e1155833e7d4ce7e3cfaf64c0d636b190db"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","baseScore":7.1,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The crafted EDID reaches the parser through a local device node — 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 — 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."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T04:57:23.260Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"5.10.261"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.19","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-64546","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-10-16T15:42:17.796608Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-125","lang":"en","type":"CWE","description":"CWE-125 Out-of-bounds Read"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T20:48:40.025Z"}}]}}}