An issue was discovered in split_region in uc.c in Unicorn Engine before 2.0.0-rc5.
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
An issue was discovered in split_region in uc.c in Unicorn Engine before 2.0.0-rc5. It allows local attackers to escape the sandbox. An attacker must first obtain the ability to execute crafted code in the target sandbox in order to exploit this vulnerability. The specific flaw exists within the virtual memory manager. The issue results from the faulty comparison of GVA and GPA while calling uc_mem_map_ptr to free part of a claimed memory block. An attacker can leverage this vulnerability to escape the sandbox and execute arbitrary code on the host machine.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:unicorn-engine:unicorn_engine:*:*:*:*:*:*:*:* | up to 1.0.3 | Vulnerable | Unicorn-engine |
| cpe:2.3:a:unicorn-engine:unicorn_engine:2.0.0:rc1:*:*:*:*:*:* | 2.0.0 rc1 | Vulnerable | Unicorn-engine |
| cpe:2.3:a:unicorn-engine:unicorn_engine:2.0.0:rc2:*:*:*:*:*:* | 2.0.0 rc2 | Vulnerable | Unicorn-engine |
| cpe:2.3:a:unicorn-engine:unicorn_engine:2.0.0:rc3:*:*:*:*:*:* | 2.0.0 rc3 | Vulnerable | Unicorn-engine |
| cpe:2.3:a:unicorn-engine:unicorn_engine:2.0.0:rc4:*:*:*:*:*:* | 2.0.0 rc4 | Vulnerable | Unicorn-engine |
- cpe:2.3:a:unicorn-engine:unicorn_engine:*:*:*:*:*:*:*:* Versions up to 1.0.3 Vulnerable ·Unicorn-engine
- cpe:2.3:a:unicorn-engine:unicorn_engine:2.0.0:rc1:*:*:*:*:*:* Versions 2.0.0 rc1 Vulnerable ·Unicorn-engine
- cpe:2.3:a:unicorn-engine:unicorn_engine:2.0.0:rc2:*:*:*:*:*:* Versions 2.0.0 rc2 Vulnerable ·Unicorn-engine
- cpe:2.3:a:unicorn-engine:unicorn_engine:2.0.0:rc3:*:*:*:*:*:* Versions 2.0.0 rc3 Vulnerable ·Unicorn-engine
- cpe:2.3:a:unicorn-engine:unicorn_engine:2.0.0:rc4:*:*:*:*:*:* Versions 2.0.0 rc4 Vulnerable ·Unicorn-engine
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-44078
- 2026-10-03 Alias added: GHSA-rmvm-v6m6-87vr
References
Patch 2
More Unicorn-engine Unicorn Engine vulnerabilities
- TI-2022-12108 Unicorn Engine v2.0.0-rc7 and below was discovered to contain a NULL pointer dereference via qemu_ram_free. CVSS 3.1HIGH 7.5
- TI-2022-12106 Unicorn Engine v1.0.3 was discovered to contain a use-after-free vulnerability via the hook function. CVSS 3.1HIGH 7.8
- TI-2022-12109 Unicorn Engine v2.0.0-rc7 contains memory leaks caused by an incomplete unicorn engine initialization. CVSS 3.1HIGH 7.5
- TI-2022-12107 Unicorn Engine v2.0.0-rc7 and below was discovered to contain a memory leak via the… CVSS 3.1HIGH 7.5
- TI-2021-15054 Unicorn Engine 1.0.2 has an out-of-bounds write in tb_flush_armeb (called from… CVSS 3.1MEDIUM 5.5
- TI-2020-18679 Unicorn Engine 1.0.2 has an out-of-bounds write in helper_wfe_arm. CVSS 3.1MEDIUM 5.5
Sources
- CVE-2021-44078 · CVE Program
- CVE-2021-44078 · NVD
- FIRST EPSS
- GHSA-rmvm-v6m6-87vr · GitHub Advisory Database · CC BY 4.0
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