CVE-2025-8860
published 2026-02-18CVE-2025-8860: 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…
PriorityP413low3.3CVSS 3.1
AVLACLPRLUINSUCLINAN
EPSS
0.15%
4.4th percentile
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
3 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | qemu | < qemu 1:10.0.3+ds-4 (forky) | qemu 1:10.0.3+ds-4 (forky) |
| qemu | qemu | >= 0 < 1:10.0.3+ds-4 | 1:10.0.3+ds-4 |
| qemu | qemu | >= 0 < 1:10.0.3+ds-4 | 1:10.0.3+ds-4 |
CVSS provenance
nvdv3.13.3LOWCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
osv3.3LOW
vendor_debian3.3LOW
vendor_redhat3.3LOW
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Red Hat
qemu-kvm: uefi-vars: information disclosure vulnerability in uefi_vars_write callback
vendor_redhat·2025-08-11·CVSS 3.3
CVE-2025-8860 [LOW] CWE-212 qemu-kvm: uefi-vars: information disclosure vulnerability in uefi_vars_write callback
qemu-kvm: uefi-vars: information disclosure vulnerability in uefi_vars_write callback
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.
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_va
Debian
CVE-2025-8860: qemu - A flaw was found in QEMU in the uefi-vars virtual device. When the guest writes ...
vendor_debian·2025·CVSS 3.3
CVE-2025-8860 [LOW] CVE-2025-8860: qemu - A flaw was found in QEMU in the uefi-vars virtual device. When the guest writes ...
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.
Scope: local
bookworm: resolved
bullseye: resolved
forky: resolved (fixed in 1:10.0.3+ds-4)
sid: resolved (fixed in 1:10.0.3+ds-4)
trixie: resolved (fixed in 1:10.0.3+ds-4)
GHSA
GHSA-xrj7-v4x4-74hr: A flaw was found in QEMU in the uefi-vars virtual device
ghsa_unreviewed·2026-02-18
CVE-2025-8860 [LOW] CWE-212 GHSA-xrj7-v4x4-74hr: A flaw was found in QEMU in the uefi-vars virtual device
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.
OSV
CVE-2025-8860: A flaw was found in QEMU in the uefi-vars virtual device
osv·2026-02-18·CVSS 3.3
CVE-2025-8860 [LOW] CVE-2025-8860: A flaw was found in QEMU in the uefi-vars virtual device
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.
OSV
CVE-2025-8860: When the guest writes to register UEFI_VARS_REG_BUFFER_SIZE, the
osv·2025-08-20·CVSS 3.3
CVE-2025-8860 [LOW] CVE-2025-8860: When the guest writes to register UEFI_VARS_REG_BUFFER_SIZE, the
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.
No detection rules found.
No public exploits indexed.
2026-02-18
Published