CVE-2026-105958 Spice-server: spice: heap oob read/write via unchecked migration data offsets
A malicious authenticated SPICE client can trigger heap out-of-bounds read/write during VM live migration, potentially leading to code execution or information disclosure.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-105958?
CVE-2026-105958 is a high-severity memory corruption vulnerability in Red Hat Enterprise Linux 6, published on 16 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A flaw was found in spice-server. Multiple migration data handlers use client-supplied offsets from SPICE_MSGC_MIGRATE_DATA messages without bounds validation, allowing a malicious authenticated SPICE client during VM live migration to read arbitrary heap memory or trigger heap corruption via out-of-bounds read and write operations on the message buffer.
Weakness: CWE-787
Which versions are affected by CVE-2026-105958?
How do I fix CVE-2026-105958?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-105958 being exploited?
There is no known exploitation of CVE-2026-105958 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-105958, DEBIAN-CVE-2026-105958, GHSA-q367-g3jh-xmfv, UBUNTU-CVE-2026-105958.