CVE-2026-64122

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

net/mlx5e: Fix use-after-free in mlx5e_tx_reporter_timeout_recover

mlx5e_tx_reporter_timeout_recover() accesses sq->netdev after

mlx5e_safe_reopen_channels() has torn down and freed the channel (and

its embedded SQs). Replace the three sq->netdev references with

priv->netdev which is safe because priv outlives channel teardown.

The netdev_err() call already used priv->netdev for this reason; make

the trylock/unlock and health_channel_eq_recover calls consistent.

This fixes the following KASAN splat:

BUG: KASAN: use-after-free in mlx5e_tx_reporter_timeout_recover+0x1dd/0x360 [mlx5_core]

Read of size 8 at addr ffff889860ed0b28 by task kworker/u113:2/5277

Call Trace:

mlx5e_tx_reporter_timeout_recover+0x1dd/0x360 [mlx5_core]

devlink_health_reporter_recover+0xa2/0x150

devlink_health_report+0x254/0x7c0

mlx5e_reporter_tx_timeout+0x297/0x380 [mlx5_core]

mlx5e_tx_timeout_work+0x109/0x170 [mlx5_core]

process_one_work+0x677/0xf20

worker_thread+0x51f/0xd90

kthread+0x3a5/0x810

ret_from_fork+0x208/0x400

ret_from_fork_asm+0x1a/0x30