CVE-2025-8860

CVE-2025-8860 · Qemu-kvm: uefi-vars: information disclosure vulnerability in uefi_vars_write callback

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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.

CVSS 3.3 · Low · EPSS 0.2% · Fix available

Published

2026-02-18T20:49:06.186Z

Updated

2026-02-19T14:35:51.033Z

Stack: system

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