{"id":"CVE-2025-8860","summary":"Qemu-kvm: uefi-vars: information disclosure vulnerability in uefi_vars_write callback","details":"A flaw was found in QEMU in the uefi-vars virtual device. When the guest writes to register UEFI_VARS_REG_BUFFER_SIZE, the .write callback `uefi_vars_write` is invoked. The function allocates a heap buffer without zeroing the memory, leaving the buffer filled with residual data from prior allocations. When the guest later reads from register UEFI_VARS_REG_PIO_BUFFER_TRANSFER, the .read callback `uefi_vars_read` returns leftover metadata or other sensitive process memory from the previously allocated buffer, leading to an information disclosure vulnerability.","modified":"2026-07-15T01:48:51.421665743Z","published":"2026-02-18T20:49:06.186Z","database_specific":{"cwe_ids":["CWE-212"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/8xxx/CVE-2025-8860.json","cna_assigner":"fedora"},"references":[{"type":"WEB","url":"https://access.redhat.com/downloads/content/package-browser/"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2025-8860"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/8xxx/CVE-2025-8860.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-8860"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2387588"},{"type":"PACKAGE","url":"https://gitlab.com/qemu-project/qemu"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://gitlab.com/qemu-project/qemu","events":[{"introduced":"7c949c53e936aa3a658d84ab53bae5cadaa5d59c"},{"fixed":"f8b2f64e2336a28bf0d50b6ef8a7d8c013e9bcf3"}],"database_specific":{"extracted_events":[{"introduced":"10.0.0"},{"fixed":"10.1.0"}],"source":"AFFECTED_FIELD"}}],"versions":["v10.1.0-rc4","v10.1.0-rc3","v10.1.0-rc2","v10.1.0-rc1","v10.1.0-rc0","v10.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-8860.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"}]}