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 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)

Timeline

1. Oct 18, 2026, 3:48 PM UTCCVE published
2. Oct 19, 2026, 9:26 AM UTCRecord last updated

Affected versions

• Linux Linux

  From 54493a08e21f46446b3b24577c5a6f229d049757 · fixed in 16ca0e79f31ea810346a79dda545ba344ede1d47; From 54493a08e21f46446b3b24577c5a6f229d049757 · fixed in 3a6e67ff267af2053a793825c3b7844741fed461; From 54493a08e21f46446b3b24577c5a6f229d049757 · fixed in 8117cbc504cb01980258d8a8c9be8f57cf0aaceb; From 54493a08e21f46446b3b24577c5a6f229d049757 · fixed in 04c824940d52871c49866a4ac67b504146f7cf35

• Linux Linux

  5.18

• KernelLinux

  From 5.18.0 · fixed in 6.12.113; From 6.13.0 · fixed in 6.18.56; From 6.19.0 · fixed in 7.2.10

References 4