CVE-2026-64122
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk38th percentile - higher than 38% of all known CVEs
Summary
In the Linux kernel, a use-after-free vulnerability was found in the mlx5e driver in the mlx5e_tx_reporter_timeout_recover function. The issue occurs when the function accesses sq->netdev after mlx5e_safe_reopen_channels() has torn down and freed the channel (and its SQs). The fix replaces three sq->netdev references with priv->netdev, which is safe because priv outlives channel teardown.
Risk Assessment
The vulnerability could lead to system crashes (kernel panic) or potentially arbitrary code execution in kernel context, posing a serious risk to system stability and security.
Recommendation
Immediately update the Linux kernel to a version containing the fix (commit in the net/mlx5e branch). Monitor official kernel distribution sources and apply the security patch.
Original NVD description (English source)
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