Quick answers
- Is CVE-2026-121803 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-121803 being exploited in the wild.
- How severe is CVE-2026-121803?
- Critical severity, with a CVSS score of 9.3, published 4 November 2026.
- Which products and versions are affected?
- Unisoc SC9863A; Unisoc SC9832E; Unisoc SC7731E; Unisoc T310; and 12 more.
- Is there a fix for CVE-2026-121803?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-121803 attacked?
- It is attacked with physical access, in device firmware.
- Am I affected by CVE-2026-121803?
- Check whether you run Unisoc Sc7731e, Unisoc Sc9832e, Unisoc Sc9863a or one of the others listed. 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 UFS Field Firmware Update (FFU) functionality lacks bounds checking on the PRDT (Physical Region Descriptor Table) size, resulting in an out-of-bounds write (CWE-787). The vulnerability requires physical access to the device and no elevation of privilege. Exploitation can lead to heap memory corruption, arbitrary code execution, or denial of service. Chipsets affected include SC9863A, SC9832E, SC7731E, T310, T610, T618, T7200, T7225, T7250, T7255, T7280, T8100, T9100, T8200, T7300, and T8300.
Affected products
- Unisoc SC9863A
- Unisoc SC9832E
- Unisoc SC7731E
- Unisoc T310
- Unisoc T610
- Unisoc T618
- Unisoc T7200
- Unisoc T7225
- Unisoc T7250
- Unisoc T7255
- Unisoc T7280
- Unisoc T8100
- Unisoc T9100
- Unisoc T8200
- Unisoc T7300
- Unisoc T8300
Timeline
- 2026-11-04: disclosed