Vulnerability · Published Feb 18, 2026 · Assigned by fedora
CVE-2025-8860Qemu-kvm: uefi-vars: information disclosure vulnerability in uefi_vars_write callback
Low 3.3
In plain English
A low-severity security flaw in qemu. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 6% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | qemu | 1:10.0.3+ds-4 | DEBIAN-CVE-2025-8860 |
| Debian:14 | qemu | 1:10.0.3+ds-4 | DEBIAN-CVE-2025-8860 |
| Ubuntu:22.04:LTS | qemu | no fix listed | UBUNTU-CVE-2025-8860 |
| Ubuntu:24.04:LTS | qemu | no fix listed | UBUNTU-CVE-2025-8860 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| qemu | 10.0.0 – before 10.1.0 | |
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 6 | see references |
| Red Hat | Red Hat Enterprise Linux 7 | see references |
| Red Hat | Red Hat Enterprise Linux 7 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 8 Advanced Virtualization | see references |
| Red Hat | Red Hat Enterprise Linux 8 Advanced Virtualization | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
| Red Hat | Red Hat OpenShift Container Platform 4 | see references |
Weakness: CWE-212 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
References
- https://access.redhat.com/security/cve/CVE-2025-8860 vdb-entry, x_refsource_REDHAT
- RHBZ#2387588 issue-tracking, x_refsource_REDHAT