{"id":"CVE-2026-64524","summary":"drm/hyperv: validate resolution_count and fix WIN8 fallback","details":"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 \u003e 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-\u003escreen_*_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.","modified":"2026-07-28T04:03:10.836949332Z","published":"2026-07-25T09:20:48.193Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64524.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/13d33b9ef67066c77c84273fac5a1d3fde3533d1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1fb565b77b8f44afabb02de6310065f109d89e94"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8a114b25b5521eae451b13bce98ae978624962e5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/96f7de3172d4aa878b7f87173b2b3507c350fcd6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9c698b2c43c2667c34f5336bf46ad5786216ac2a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a321c908f2eeea01539668eb270d074d9b88e490"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bc573752f3dac0d1ab8df7078c1851bc76717653"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64524.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64524"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"76c56a5affeba1e163b66b9d8cc192e6154466f0"},{"fixed":"96f7de3172d4aa878b7f87173b2b3507c350fcd6"},{"fixed":"bc573752f3dac0d1ab8df7078c1851bc76717653"},{"fixed":"1fb565b77b8f44afabb02de6310065f109d89e94"},{"fixed":"a321c908f2eeea01539668eb270d074d9b88e490"},{"fixed":"9c698b2c43c2667c34f5336bf46ad5786216ac2a"},{"fixed":"8a114b25b5521eae451b13bce98ae978624962e5"},{"fixed":"13d33b9ef67066c77c84273fac5a1d3fde3533d1"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64524.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.14.0"},{"fixed":"5.15.210"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.176"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.143"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.93"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.35"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.12"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64524.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"}]}