---
id: CVE-2026-63973
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: mana: Add NULL guards in teardown path to prevent panic on attach failure

  When queue allocation fails partway through, the error cleanup frees
  and NULLs apc->tx_q…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: mana: Add NULL guards in teardown path to prevent panic on attach failure

  When queue allocation fails partway through, the error cleanup frees
  and NULLs apc->tx_q…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-476
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 5.13, < 6.1.176'
  - 'linux_kernel >= 6.2, < 6.6.143'
  - 'linux_kernel >= 6.7, < 6.12.93'
  - 'linux_kernel >= 6.13, < 6.18.35'
  - 'linux_kernel >= 6.19, < 7.0.12'
  - linux_kernel = 7.1
patched:
  - linux_kernel 7.0.12
published: '2026-07-19'
updated: '2026-10-02'
sourceUpdated: '2026-10-02T19:42:32.457'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-63973'
references:
  - url: 'https://git.kernel.org/stable/c/0a9c520fdcb1cb2e79c163c12d359b5e1ee40007'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/17bfe0a8c014ee1d542ad352cd6a0a505361664a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/26a96fa81496afe7d162d172ccdc8cb9dbc685d2'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/95e414f8324385771bdfd6d497a01d5593813ccb'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/da7e4a1aaf397af6a094f640c92d6bc7564c10db'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/da87896f34e0a51489811d1a684e2953099ca98f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00211
epssPercentile: 0.10356
ingestedAt: '2026-10-02T22:33:09.808Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

net: mana: Add NULL guards in teardown path to prevent panic on attach failure

When queue allocation fails partway through, the error cleanup frees
and NULLs apc->tx_qp and apc->rxqs. Multiple teardown paths such as
mana_remove(), mana_change_mtu() recovery, and internal error handling
in mana_alloc_queues() can subsequently call into functions that
dereference these pointers without NULL checks:

- mana_chn_setxdp() dereferences apc->rxqs[0], causing a NULL pointer
  dereference panic (CR2: 0000000000000000 at mana_chn_setxdp+0x26).
- mana_destroy_vport() iterates apc->rxqs without a NULL check.
- mana_fence_rqs() iterates apc->rxqs without a NULL check.
- mana_dealloc_queues() iterates apc->tx_qp without a NULL check.

Add NULL guards for apc->rxqs in mana_fence_rqs(),
mana_destroy_vport(), and before the mana_chn_setxdp() call. Add a
NULL guard for apc->tx_qp in mana_dealloc_queues() to skip TX queue
draining when TX queues were never allocated or already freed.

## Affected

- `linux_kernel >= 5.13, < 6.1.176`
- `linux_kernel >= 6.2, < 6.6.143`
- `linux_kernel >= 6.7, < 6.12.93`
- `linux_kernel >= 6.13, < 6.18.35`
- `linux_kernel >= 6.19, < 7.0.12`
- `linux_kernel = 7.1`

## Remediation

Upgrade past the affected range:

- `linux_kernel 7.0.12`