CVE-2021-25370: Samsung Mobile Devices Memory Corruption Vulnerability

CVE-2021-25370 is a memory corruption vulnerability in Samsung mobile devices that use the Mali GPU. An incorrect implementation for handling a file descriptor in the dpu driver can cause memory corruption that leads to a kernel panic. The issue was chained with CVE-2021-25337 and CVE-2021-25369. For enterprise and security teams managing fleets of Samsung devices, this matters because kernel-level instability or compromise on mobile endpoints can disrupt operations, enable further privilege escalation chains, and increase the risk of device takeover if left unpatched. Confirm all product and version details against the vendor advisory.

How it works

The weakness is classified as CWE-416. According to the available summary, Samsung mobile devices using the Mali GPU contain an incorrect implementation for handling a file descriptor inside the dpu driver. That flaw produces memory corruption and can result in a kernel panic. Public detail on exact exploit mechanics is limited; an attacker who can reach the vulnerable driver path would abuse the incorrect file-descriptor handling to trigger the corruption. The vulnerability has been observed chained with CVE-2021-25337 and CVE-2021-25369, which can increase impact by combining multiple flaws. Specifics of any local or remote trigger conditions must be confirmed against the vendor advisory rather than assumed.

Am I affected? How to find it in your systems

This issue affects Samsung mobile devices that incorporate the Mali GPU and the associated dpu driver. Such devices commonly appear as employee smartphones, tablets, or managed mobile endpoints in corporate environments. Inventory steps include:

• Query mobile-device management (MDM) or enterprise mobility management (EMM) consoles for Samsung models and their current OS or security-patch levels.
• Check device settings or diagnostic reports for Mali GPU presence and dpu-related driver components where the platform exposes that information.
• Cross-reference installed firmware or security patch dates against the Samsung advisory for CVE-2021-25370; do not rely on generic Android version numbers alone.
• Review crash or kernel-panic logs from devices for dpu-driver or GPU-related faults that coincide with the vulnerability window, while recognizing that panics alone are not definitive proof of exploitation.

Telemetry signs of exploitation are not detailed in public sources for this CVE; monitor for unexpected kernel panics, repeated device reboots, or anomalous local privilege activity that might indicate chaining with the related CVEs. Always validate affected configurations against the official vendor advisory.

How to remediate

Apply the updates supplied by Samsung according to the vendor instructions, as required by the CISA guidance for this vulnerability. Prioritize devices that are in active use and those that have not yet received the security patch addressing the dpu-driver file-descriptor handling flaw. After patching:

• Verify the installed security patch level or firmware version matches the fixed release listed in the advisory.
• Reboot devices if required by the update process and confirm the dpu driver is no longer vulnerable.
• For the broader class of memory-corruption issues in GPU or display drivers, enforce least-privilege app permissions, keep the full OS security baseline current, and restrict sideloading of untrusted packages that could interact with low-level drivers.

Document the remediation status in your asset inventory so that residual risk can be tracked.

If you can't patch immediately

When immediate patching is not feasible, reduce exposure with compensating controls while the vendor update is scheduled:

• Segment affected Samsung devices onto restricted network segments or apply mobile-device policies that limit access to sensitive corporate resources.
• Use MDM/EMM controls to disable unnecessary local features or apps that could interact with the GPU or display pipeline if the advisory indicates such options exist.
• Increase monitoring for kernel panics, unexpected reboots, and signs of privilege-escalation activity that might relate to chaining with CVE-2021-25337 or CVE-2021-25369.
• Apply any available virtual-patching or endpoint-protection rules that detect anomalous driver interactions, while recognizing these are temporary measures only.
• Restrict physical and local access to the devices and enforce strong authentication so that an attacker has fewer opportunities to reach the vulnerable code path.

These steps lower risk but do not eliminate the underlying memory-corruption condition; plan to apply the official update as soon as possible.

If your data may have been exposed

Actively exploited vulnerabilities can lead to device compromise and subsequent data exposure even when ransomware use is not documented for this specific CVE. If you suspect devices were targeted, treat them as potentially compromised: isolate them, collect forensic images where feasible, rotate credentials that may have been accessible from the device, and review access logs for lateral movement. Readers can also run a free exposure scan of their email addresses against known breach data sets to determine whether associated accounts appear in public breach corpora, then follow standard credential-reset and monitoring practices.