Qemu-kvm: uefi-vars: information disclosure vulnerability in uefi_vars_write callback_CVE-2025-8860

3.3 / 10

LOW

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Description

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.

Basic Information

ID CVE-2025-8860

Source fedora

Published Feb 18, 2026 at 20:49

Affected Product

Version 10.0.0

Affected Versions 10.0.0

CWE Classification

CWE-212

References

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    "published": "2026-02-18T20:49:06.186Z",
    "modified": "2026-02-18T20:49:06.186Z",
    "type": "cve",
    "title": "Qemu-kvm: uefi-vars: information disclosure vulnerability in uefi_vars_write callback",
    "source": "fedora",
    "references": "https://access.redhat.com/security/cve/CVE-2025-8860\nhttps://bugzilla.redhat.com/show_bug.cgi?id=2387588",
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