UBUNTU-CVE-2026-98807: Low severity ubuntu/linux-hwe-edge vulnerability
In the Linux kernel, the following vulnerability has been resolved: net/mlx5: Fix slab-out-of-bounds when handling team device events The mlx5handlechangeupperevent() and mlx5handlechangeinfodataevent() functions check for LAG masters (which includes both bonding and team devices) but only call bonding-specific APIs. When processing team device events, calling bondslavegetrcu() and bondisslaveinactive() on teamport structures causes KASAN to detect an out-of-bounds memory access since teamport 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 mlx5handlechangeinfodataevent(), 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 Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Compensating control
Wrap the bonding-specific API calls in mlx5_handle_changeupper_event() and mlx5_handle_changeinfodata_event() with checks that the device is a bonding device; retain the explicit bond check in mlx5_handle_changeinfodata_event() because mlx5 does not handle state information for team ports.