CVE-2026-23789 Use after free in Exynos 850 firmware
A double-free in the Exynos MFC encoder driver allows attackers to corrupt kernel memory and potentially execute arbitrary code on affected Samsung devices.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-23789?
CVE-2026-23789 is a high-severity use after free vulnerability in Samsung Exynos 850 firmware, published on 14 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
An issue was discovered in MFC in Samsung Mobile Processor and Wearable Processor Exynos 850, 1080, 2100, 1280, 2200, 1330, 1380, 1480, 2400, 1580, 2500, 2600, 1680, W920, W930, and W1000. A double-free vulnerability in the Exynos MFC encoder driver (due to improper cleanup of dma_buf references during error handling) leads to kernel memory corruption and potential arbitrary code execution.
Weakness: CWE-415
Which versions are affected by CVE-2026-23789?
How do I fix CVE-2026-23789?
No fix has been published for CVE-2026-23789 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-23789 being exploited?
There is no known exploitation of CVE-2026-23789 in the wild and no public exploit code.
Sources
Also known as GHSA-9jqf-p4p9-5v4p.