{"id":"CVE-2026-74312","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-74312","summary":"vhost/vdpa: validate virtqueue index in mmap and fault paths","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nvhost/vdpa: validate virtqueue index in mmap and fault paths\n\nvhost_vdpa_mmap() and vhost_vdpa_fault() use vma->vm_pgoff as a\nvirtqueue index for get_vq_notification(), but they do not validate\nthat the index is smaller than v->nvqs.\n\nThe ioctl path already performs both a bounds check and\narray_index_nospec(), but the mmap/fault path only checks that the\nindex fits in u16. This allows an out-of-range queue index to reach\ndriver-specific get_vq_notification() callbacks.\n\nFix this by extracting a unified vhost_vdpa_get_vq_notification()\nhelper that validates the queue index against v->nvqs and applies\narray_index_nospec() before calling the driver callback. Both the\nmmap and fault paths use this helper, and the bounds checking is\nconsolidated into a single location.\n\nFrom source inspection, the most defensible impact is out-of-bounds\naccess in the callback path, potentially leading to invalid PFN\nremaps and crash/DoS.","published":"2026-08-15T05:58:11.395Z","modified":"2026-08-18T03:56:46.670781105Z","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":"5.10.261"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0f310bac6db9bd3bb1655707d692d9d2a86eeb17"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1f5f94c6c6b2e4eaa5b45815509e21d0c6cfa81e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2b3f79b90b231a682315fe2191bb71925650e183"},{"type":"WEB","url":"https://git.kernel.org/stable/c/32ac9097aa2463fcfc12f61cc4a9ebc3579cba7d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4bf5a51963ff816f7443702dc536b9327cf5e550"},{"type":"WEB","url":"https://git.kernel.org/stable/c/55a644031e610ea93fbde2702c7b8f267476552f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/929e4f044621c8cc30b612fb74e1410bef09e41b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bbba4f92515238d76018e9b75e41b16d83df52c8"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74312.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74312"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-18T03:56:46.670781105Z"}}