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

net/mlx5e: CT: Fix null-ptr-deref in add rule err flow

In error flow of mlx5_tc_ct_entry_add_rule(), in case ct_rule_add()
callback returns error, zone_rule->attr is used uninitiated. Fix it to
use attr which has the needed pointer value.

Kernel log:
 BUG: kernel NULL pointer dereference, address: 0000000000000110
 RIP: 0010:mlx5_tc_ct_entry_add_rule+0x2b1/0x2f0 [mlx5_core]
…
 Call Trace:
  <TASK>
  ? __die+0x20/0x70
  ? page_fault_oops+0x150/0x3e0
  ? exc_page_fault+0x74/0x140
  ? asm_exc_page_fault+0x22/0x30
  ? mlx5_tc_ct_entry_add_rule+0x2b1/0x2f0 [mlx5_core]
  ? mlx5_tc_ct_entry_add_rule+0x1d5/0x2f0 [mlx5_core]
  mlx5_tc_ct_block_flow_offload+0xc6a/0xf90 [mlx5_core]
  ? nf_flow_offload_tuple+0xd8/0x190 [nf_flow_table]
  nf_flow_offload_tuple+0xd8/0x190 [nf_flow_table]
  flow_offload_work_handler+0x142/0x320 [nf_flow_table]
  ? finish_task_switch.isra.0+0x15b/0x2b0
  process_one_work+0x16c/0x320
  worker_thread+0x28c/0x3a0
  ? __pfx_worker_thread+0x10/0x10
  kthread+0xb8/0xf0
  ? __pfx_kthread+0x10/0x10
  ret_from_fork+0x2d/0x50
  ? __pfx_kthread+0x10/0x10
  ret_from_fork_asm+0x1a/0x30
  </TASK>

https://git.kernel.org/stable/c/06dc488a593020bd2f006798557d2a32104d8359

https://git.kernel.org/stable/c/0c7c70ff8b696cfedba350411dca736361ef9a0f

https://git.kernel.org/stable/c/6030f8bd7902e9e276a0edc09bf11979e4e2bc2e

https://git.kernel.org/stable/c/e99c6873229fe0482e7ceb7d5600e32d623ed9d9