{"cve":"CVE-2026-64284","nvd":{"published":"2026-07-25T10:17:09.033","modified":"2026-10-19T21:17:29.530","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Ensure vendor's exit handler runs before fastpath userspace exits\n\nMove the handling of fastpath userspace exits into vendor code to ensure\nKVM runs vendor specific operations that need to run before userspace gains\ncontrol of the vCPU.  E.g. for VMX (and soon to be for SVM as well), KVM\nneeds to flush the PML buffer prior to exiting to userspace, otherwise any\nmemory written by the final KVM_RUN might never be flagged as dirty.\n\nNote, waiting to snapshot CR0 and CR3 until svm_handle_exit() is flawed in\ngeneral, as that risks consuming stale state in a fastpath handler.  That\nwill be addressed in a future change.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","score":7.1},"cwes":["CWE-367","CWE-362"],"references":["https://git.kernel.org/stable/c/0ffedf43910e44b76c2c1db4e9fbf12b268190c1","https://git.kernel.org/stable/c/4ad73ef0e7966ecfe67de0060537b4cb14d9acd4","https://git.kernel.org/stable/c/b3436d9b9b1affe1c3191ac9831308923f5f03c3","https://git.kernel.org/stable/c/f2ca2b5326211bd38490f0497eb583721ce0bbc0"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-21T03:43:09.190223697+00:00"},"epss":{"cve":"CVE-2026-64284","score":0.00132,"percentile":0.02739,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}