Vulnerability 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.
CVSS Score
LOW
Related Weaknesses (CWE)
References
- https://access.redhat.com/security/cve/CVE-2025-8860
- https://bugzilla.redhat.com/show_bug.cgi?id=2387588
FAQ
What is CVE-2025-8860?
CVE-2025-8860 is a vulnerability with a CVSS score of 3.3 (LOW). 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 b...
How severe is CVE-2025-8860?
CVE-2025-8860 has been rated LOW with a CVSS base score of 3.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-8860?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.