CVE-2025-8860 Affecting qemu package, versions <1:10.0.3+ds-4


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.15% (5th percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-QEMU-11798031
  • published14 Aug 2025
  • disclosed18 Feb 2026

Introduced: 14 Aug 2025

CVE-2025-8860  (opens in a new tab)

How to fix?

Upgrade Debian:unstable qemu to version 1:10.0.3+ds-4 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream qemu package and not the qemu package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

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 Base Scores

version 3.1