---
id: CVE-2026-98807
title: 'net/mlx5: Fix slab-out-of-bounds when handling team device events'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net/mlx5: Fix slab-out-of-bounds when handling team device events

  The mlx5_handle_changeupper_event() and mlx5_handle_changeinfodata_event()
  functions check for LAG ma…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 54493a08e21f46446b3b24577c5a6f229d049757 <
    16ca0e79f31ea810346a79dda545ba344ede1d47
  - >-
    Linux >= 54493a08e21f46446b3b24577c5a6f229d049757 <
    3a6e67ff267af2053a793825c3b7844741fed461
  - >-
    Linux >= 54493a08e21f46446b3b24577c5a6f229d049757 <
    8117cbc504cb01980258d8a8c9be8f57cf0aaceb
  - >-
    Linux >= 54493a08e21f46446b3b24577c5a6f229d049757 <
    04c824940d52871c49866a4ac67b504146f7cf35
  - Linux 5.18
published: '2026-10-18'
updated: '2026-10-18'
sourceUpdated: '2026-10-18T15:48:53.992Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-98807'
references:
  - url: 'https://git.kernel.org/stable/c/16ca0e79f31ea810346a79dda545ba344ede1d47'
  - url: 'https://git.kernel.org/stable/c/3a6e67ff267af2053a793825c3b7844741fed461'
  - url: 'https://git.kernel.org/stable/c/8117cbc504cb01980258d8a8c9be8f57cf0aaceb'
  - url: 'https://git.kernel.org/stable/c/04c824940d52871c49866a4ac67b504146f7cf35'
tags:
  - cve.org
ingestedAt: '2026-10-18T16:47:32.480Z'
---

## Overview

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

net/mlx5: Fix slab-out-of-bounds when handling team device events

The mlx5_handle_changeupper_event() and mlx5_handle_changeinfodata_event()
functions check for LAG masters (which includes both bonding and team
devices) but only call bonding-specific APIs. When processing team device
events, calling bond_slave_get_rcu() and bond_is_slave_inactive() on
team_port structures causes KASAN to detect an out-of-bounds memory access
since team_port is smaller than bond slave.

Fix this by wrapping the bond-specific API calls with a check for bonding
devices. This allows the function to still process LAG events for both
bonding and teams but only calls bond-specific functions when dealing with
actual bonding devices.

For mlx5_handle_changeinfodata_event(), keep the explicit bond check as
mlx5 doesn't handle state information for team ports anyway.

Tested with Mellanox ConnectX-5 on Linux 7.2.0-rc6:
- Bonding: PASS (no regressions)
- Team device: PASS (no KASAN errors)

## Affected

- `Linux >= 54493a08e21f46446b3b24577c5a6f229d049757 < 16ca0e79f31ea810346a79dda545ba344ede1d47`
- `Linux >= 54493a08e21f46446b3b24577c5a6f229d049757 < 3a6e67ff267af2053a793825c3b7844741fed461`
- `Linux >= 54493a08e21f46446b3b24577c5a6f229d049757 < 8117cbc504cb01980258d8a8c9be8f57cf0aaceb`
- `Linux >= 54493a08e21f46446b3b24577c5a6f229d049757 < 04c824940d52871c49866a4ac67b504146f7cf35`
- `Linux 5.18`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.