CVE-2026-4967: Unisoc IMS out of bounds read in modem firmware

CVE-2026-4967 · Severity: high · CVSS 7.5 · Published 2026-07-03

A vulnerability exists in the IP Multimedia Subsystem (IMS) of several Unisoc chipsets, which are components responsible for handling voice and data services on mobile devices. An attacker could remotely exploit this flaw to crash the device's modem functionality, leading to a total loss of cellular connectivity and a denial of service. This attack can be carried out over the network without any user interaction or special permissions.

Quick answers

Is CVE-2026-4967 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-4967 being exploited in the wild.
How severe is CVE-2026-4967?
High severity, with a CVSS score of 7.5, published 3 July 2026.
Which products and versions are affected?
Unisoc SC7731E Android 13, 14, 15, 16; Unisoc SC9832E Android 13, 14, 15, 16; Unisoc SC9863A Android 13, 14, 15, 16; Unisoc T310 Android 13, 14, 15, 16; and 12 more.
Is there a fix for CVE-2026-4967?
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-2026-4967 attacked?
It is attacked over the network, in device firmware.
Am I affected by CVE-2026-4967?
Check whether anything you run is named in the advisory. 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

A vulnerability classified as a stack-based buffer overflow (CWE-121) and out-of-bounds read exists in the IMS (IP Multimedia Subsystem) component of the Unisoc modem firmware. The root cause is a missing bounds check when processing incoming network data. A remote, unauthenticated attacker can exploit this over the network (AV:N) with low complexity (AC:L) and no user interaction (UI:N). Successful exploitation results in a denial of service (DoS) of the modem functionality. The issue affects multiple chipsets including SC7731E, T610, and T8300 running Android versions 13 through 16.

Affected products

  • Unisoc SC7731E Android 13, 14, 15, 16
  • Unisoc SC9832E Android 13, 14, 15, 16
  • Unisoc SC9863A Android 13, 14, 15, 16
  • Unisoc T310 Android 13, 14, 15, 16
  • Unisoc T610 Android 13, 14, 15, 16
  • Unisoc T618 Android 13, 14, 15, 16
  • Unisoc T7200 Android 13, 14, 15, 16
  • Unisoc T7225 Android 13, 14, 15, 16
  • Unisoc T7250 Android 13, 14, 15, 16
  • Unisoc T7255 Android 13, 14, 15, 16
  • Unisoc T7280 Android 13, 14, 15, 16
  • Unisoc T7300 Android 13, 14, 15, 16
  • Unisoc T8100 Android 13, 14, 15, 16
  • Unisoc T9100 Android 13, 14, 15, 16
  • Unisoc T8200 Android 13, 14, 15, 16
  • Unisoc T8300 Android 13, 14, 15, 16

Timeline

  • 2026-07-03: advisory
  • 2026-07-03: disclosed

References

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