Description
A flaw was found in spice-server. The GLZ encoder dictionary restore path truncates a size_t allocation size to int when calling the malloc callback, allowing a malicious authenticated SPICE client during VM live migration to trigger a massive heap buffer overflow by sending a crafted max_encoders value in migration data.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | spice | No fix yet | — |
| Debian 13 | spice | No fix yet | — |
| Debian 12 | spice | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | spice +2 | No fix yet | — |
| Ubuntu 26.04 LTS | spice +2 | No fix yet | — |
| Ubuntu 24.04 LTS | spice +2 | No fix yet | — |
| Ubuntu 22.04 LTS | spice +2 | No fix yet | — |
| Ubuntu 20.04 LTS | spice +2 | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | spice +2 | No fix yet | — |
| Ubuntu 16.04 LTS | spice +2 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | spice | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | spice | 0.16.0-3.1 | openSUSE-SU-2026:12222-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | spice-server +1 | 0.14.0-10.amzn2 | ALAS2-2026-4030 |
Advisories 2
- ALAS2-2026-4030 Important: spice security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Oct 26, 2026
- openSUSE-SU-2026:12222-1 libspice-server-devel-0.16.0-3.1 on GA media SUSE / openSUSE Security Updates · Oct 22, 2026