CVE-2025-8860 Affecting qemu-guest-agent package, versions <31:7.2.0-37.el9


Severity

Recommended
medium

Based on Oracle Linux security rating.

Threat Intelligence

EPSS
0.15% (5th percentile)

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  • Snyk IDSNYK-ORACLE9-QEMUGUESTAGENT-16324368
  • published1 May 2026
  • disclosed18 Feb 2026

Introduced: 18 Feb 2026

CVE-2025-8860  (opens in a new tab)

How to fix?

Upgrade Oracle:9 qemu-guest-agent to version 31:7.2.0-37.el9 or higher.
This issue was patched in ELSA-2026-50241.

NVD Description

Note: Versions mentioned in the description apply only to the upstream qemu-guest-agent package and not the qemu-guest-agent package as distributed by Oracle. See How to fix? for Oracle:9 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