{"id":"CVE-2026-64524","revision":null,"records":[{"revision":"2c7eb2e995f14b0aaa8fdfae7784fcc2","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-64524","aliases":[],"title":"drm/hyperv: validate resolution_count and fix WIN8 fallback","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/hyperv: validate resolution_count and fix WIN8 fallback\n\nA SYNTHVID_RESOLUTION_RESPONSE with resolution_count > 64 walks past\nthe supported_resolution[SYNTHVID_MAX_RESOLUTION_COUNT] array in the\nparse loop. Bound resolution_count against the array size, folded\ninto the existing zero-check.\n\nWhen the WIN10 resolution probe fails, the caller in\nhyperv_connect_vsp() left hv->screen_*_max / preferred_* unpopulated,\nwhich sets mode_config.max_width / max_height to 0 and makes\ndrm_internal_framebuffer_create() reject every userspace framebuffer\nwith -EINVAL. The pre-WIN10 branch had the same gap for\npreferred_width / preferred_height. Use a single post-probe fallback\nguarded by screen_width_max == 0 so both paths converge on the WIN8\ndefaults.","state":0,"publishedAt":"2026-07-25T09:20:48.193+00:00","modifiedAt":"2026-10-19T20:48:38.013+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/gpu/drm/hyperv/hyperv_drm_proto.c\"\n ],\n \"versions\": [\n {\n \"version\": \"76c56a5affeba1e163b66b9d8cc192e6154466f0\",\n \"lessThan\": \"96f7de3172d4aa878b7f87173b2b3507c350fcd6\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"76c56a5affeba1e163b66b9d8cc192e6154466f0\",\n \"lessThan\": \"bc573752f3dac0d1ab8df7078c1851bc76717653\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"76c56a5affeba1e163b66b9d8cc192e6154466f0\",\n \"lessThan\": \"1fb565b77b8f44afabb02de6310065f109d89e94\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"76c56a5affeba1e163b66b9d8cc192e6154466f0\",\n \"lessThan\": \"a321c908f2eeea01539668eb270d074d9b88e490\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"76c56a5affeba1e163b66b9d8cc192e6154466f0\",\n \"lessThan\": \"9c698b2c43c2667c34f5336bf46ad5786216ac2a\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"76c56a5affeba1e163b66b9d8cc192e6154466f0\",\n \"lessThan\": \"8a114b25b5521eae451b13bce98ae978624962e5\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"76c56a5affeba1e163b66b9d8cc192e6154466f0\",\n \"lessThan\": \"13d33b9ef67066c77c84273fac5a1d3fde3533d1\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/gpu/drm/hyperv/hyperv_drm_proto.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.14\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.14\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.210\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.176\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.143\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.93\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.35\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.0.12\",\n \"lessThanOrEqual\": \"7.0.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","score":7.7,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/96f7de3172d4aa878b7f87173b2b3507c350fcd6","https://git.kernel.org/stable/c/bc573752f3dac0d1ab8df7078c1851bc76717653","https://git.kernel.org/stable/c/1fb565b77b8f44afabb02de6310065f109d89e94","https://git.kernel.org/stable/c/a321c908f2eeea01539668eb270d074d9b88e490","https://git.kernel.org/stable/c/9c698b2c43c2667c34f5336bf46ad5786216ac2a","https://git.kernel.org/stable/c/8a114b25b5521eae451b13bce98ae978624962e5","https://git.kernel.org/stable/c/13d33b9ef67066c77c84273fac5a1d3fde3533d1"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64524","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-64524","identifiers":["CVE-2026-64524"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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