{"id":"CVE-2026-80702","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-80702","summary":"drm/vmwgfx: fix guest_memory_dirty bitfield clobbered as size","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vmwgfx: fix guest_memory_dirty bitfield clobbered as size\n\nTwo sites in vmwgfx_resource.c assign boolean literals to\nres->guest_memory_size, which is an unsigned long allocation-size\nfield; the intended target is the adjacent res->guest_memory_dirty\nbitfield.  After the assignments the field holds 0 or 1 instead of\nthe resource's MOB allocation size:\n\n  - vmw_resource_release()       writes 0 (false), and\n  - vmw_resource_unbind_list()   writes 1 (true).\n\nSubsequent revalidation paths read guest_memory_size when computing\nthe dirty page range (vmw_bo_dirty_transfer_to_res()) and the buffer\nallocation size (vmw_resource_buf_alloc()), producing zero-length\nwalks or wrap-around ranges that read or write past the MOB bitmap.\nThe dirty-tracking intent of the original code (mark the resource as\ndirtied since the last sync) is also lost, since guest_memory_dirty\nis never updated.\n\nRename both assignments to guest_memory_dirty.","published":"2026-08-28T06:53:05.253Z","modified":"2026-08-30T03:48:21.214393437Z","cvss":{"score":7.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"6.6.151"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/21bbe38faee4a195d33a93e3908e307807f7745d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/282f261cb035e5f01a486f76d356b7e9dbfba73f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3b2bb16a5b622867140d69925db411ac8ecb3b2b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/83195b778f2d109a3a4f3ffaba4dce7e4cdb58aa"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9d6cbb76fe9cd760351f6b0b20f1bf788eab8fa6"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80702.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80702"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-30T03:48:21.214393437Z"}}