Quick answers
- Is CVE-2026-100839 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-100839 being exploited in the wild.
- How severe is CVE-2026-100839?
- High severity, with a CVSS score of 8.4, published 27 September 2026.
- Which products and versions are affected?
- Edgeless Systems Contrast before 1.18.0.
- Is there a fix for CVE-2026-100839?
- A patch was published on 2026-03-24: v1.18.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-100839 attacked?
- It is attacked with local access.
- Am I affected by CVE-2026-100839?
- Check whether you run Edgeless Systems Contrast at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is an AML injection attack in the guest kernel's ACPI/AML interpreter. ACPI tables containing AML bytecode are passed from the host (QEMU) through firmware (OVMF) to the Linux kernel, where the AML interpreter executes them with access to full guest memory including private pages. An attacker with host-level control can craft malicious, Turing-complete AML bytecode to achieve arbitrary code execution and read/write confidential guest data. The fix sandboxes the AML interpreter to block private memory access via page table lookups.
Affected products
- Edgeless Systems Contrast before 1.18.0
Timeline
- 2026-03-24: disclosed
- 2026-09-27: advisory
- 2026-03-24: patched: v1.18.0