{
  "cveId": "CVE-2022-50726",
  "url": "https://patchblox.com/security/cve/CVE-2022-50726",
  "summary": "CVE-2022-50726 is fixed in 47 products on 1 platform, first by RHSA-2023:2458, released May 9, 2023. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  net/mlx5: Fix possible use-after-free in async c...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  net/mlx5: Fix possible use-after-free in async command interface  mlx5_cmd_cleanup_async_ctx should return only after all its callback handlers were completed. Before this patch, the below race between mlx5_cmd_cleanup_async_ctx and mlx5_cmd_exec_cb_handler was possible and lead to a use-after-free:  1. mlx5_cmd_cleanup_async_ctx is called while num_inflight is 2 (i.e.    elevated by 1, a single inflight callback). 2. mlx5_cmd_cleanup_async_ctx decreases num_inflight to 1. 3. mlx5_cmd_exec_cb_handler is called, decreases num_inflight to 0 and    is about to call wake_up(). 4. mlx5_cmd_cleanup_async_ctx calls wait_event, which returns    immediately as the condition (num_inflight == 0) holds. 5. mlx5_cmd_cleanup_async_ctx returns. 6. The caller of mlx5_cmd_cleanup_async_ctx frees the mlx5_async_ctx    object. 7. mlx5_cmd_exec_cb_handler goes on and calls wake_up() on the freed    object.  Fix it by syncing using a completion object. Mark it completed when num_inflight reaches 0.  Trace:  BUG: KASAN: use-after-free in do_raw_spin_lock\u002B0x23d/0x270 Read of size 4 at addr ffff888139cd12f4 by task swapper/5/0  CPU: 5 PID: 0 Comm: swapper/5 Not tainted 6.0.0-rc3_for_upstream_debug_2022_08_30_13_10 #1 Hardware name: QEMU Standard PC (Q35 \u002B ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014 Call Trace:  \u003CIRQ\u003E  dump_stack_lvl\u002B0x57/0x7d  print_report.cold\u002B0x2d5/0x684  ? do_raw_spin_lock\u002B0x23d/0x270  kasan_report\u002B0xb1/0x1a0  ? do_raw_spin_lock\u002B0x23d/0x270  do_raw_spin_lock\u002B0x23d/0x270  ? rwlock_bug.part.0\u002B0x90/0x90  ? __delete_object\u002B0xb8/0x100  ? lock_downgrade\u002B0x6e0/0x6e0  _raw_spin_lock_irqsave\u002B0x43/0x60  ? __wake_up_common_lock\u002B0xb9/0x140  __wake_up_common_lock\u002B0xb9/0x140  ? __wake_up_common\u002B0x650/0x650  ? destroy_tis_callback\u002B0x53/0x70 [mlx5_core]  ? kasan_set_track\u002B0x21/0x30  ? destroy_tis_callback\u002B0x53/0x70 [mlx5_core]  ? kfree\u002B0x1ba/0x520  ? do_raw_spin_unlock\u002B0x54/0x220  mlx5_cmd_exec_cb_handler\u002B0x136/0x1a0 [mlx5_core]  ? mlx5_cmd_cleanup_async_ctx\u002B0x220/0x220 [mlx5_core]  ? mlx5_cmd_cleanup_async_ctx\u002B0x220/0x220 [mlx5_core]  mlx5_cmd_comp_handler\u002B0x65a/0x12b0 [mlx5_core]  ? dump_command\u002B0xcc0/0xcc0 [mlx5_core]  ? lockdep_hardirqs_on_prepare\u002B0x400/0x400  ? cmd_comp_notifier\u002B0x7e/0xb0 [mlx5_core]  cmd_comp_notifier\u002B0x7e/0xb0 [mlx5_core]  atomic_notifier_call_chain\u002B0xd7/0x1d0  mlx5_eq_async_int\u002B0x3ce/0xa20 [mlx5_core]  atomic_notifier_call_chain\u002B0xd7/0x1d0  ? irq_release\u002B0x140/0x140 [mlx5_core]  irq_int_handler\u002B0x19/0x30 [mlx5_core]  __handle_irq_event_percpu\u002B0x1f2/0x620  handle_irq_event\u002B0xb2/0x1d0  handle_edge_irq\u002B0x21e/0xb00  __common_interrupt\u002B0x79/0x1a0  common_interrupt\u002B0x78/0xa0  \u003C/IRQ\u003E  \u003CTASK\u003E  asm_common_interrupt\u002B0x22/0x40 RIP: 0010:default_idle\u002B0x42/0x60 Code: c1 83 e0 07 48 c1 e9 03 83 c0 03 0f b6 14 11 38 d0 7c 04 84 d2 75 14 8b 05 eb 47 22 02 85 c0 7e 07 0f 00 2d e0 9f 48 00 fb f4 \u003Cc3\u003E 48 c7 c7 80 08 7f 85 e8 d1 d3 3e fe eb de 66 66 2e 0f 1f 84 00 RSP: 0018:ffff888100dbfdf0 EFLAGS: 00000242 RAX: 0000000000000001 RBX: ffffffff84ecbd48 RCX: 1ffffffff0afe110 RDX: 0000000000000004 RSI: 0000000000000000 RDI: ffffffff835cc9bc RBP: 0000000000000005 R08: 0000000000000001 R09: ffff88881dec4ac3 R10: ffffed1103bd8958 R11: 0000017d0ca571c9 R12: 0000000000000005 R13: ffffffff84f024e0 R14: 0000000000000000 R15: dffffc0000000000  ? default_idle_call\u002B0xcc/0x450  default_idle_call\u002B0xec/0x450  do_idle\u002B0x394/0x450  ? arch_cpu_idle_exit\u002B0x40/0x40  ? do_idle\u002B0x17/0x450  cpu_startup_entry\u002B0x19/0x20  start_secondary\u002B0x221/0x2b0  ? set_cpu_sibling_map\u002B0x2070/0x2070  secondary_startup_64_no_verify\u002B0xcd/0xdb  \u003C/TASK\u003E  Allocated by task 49502:  kasan_save_stack\u002B0x1e/0x40  __kasan_kmalloc\u002B0x81/0xa0  kvmalloc_node\u002B0x48/0xe0  mlx5e_bulk_async_init\u002B0x35/0x110 [mlx5_core]  mlx5e_tls_priv_tx_list_cleanup\u002B0x84/0x3e0 [mlx5_core]  mlx5e_ktls_cleanup_tx\u002B0x38f/0x760 [mlx5_core]  mlx5e_cleanup_nic_tx\u002B0xa7/0x100 [mlx5_core]  mlx5e_detach_netdev\u002B0x1c ---truncated---",
  "published": "2023-05-09T00:00:00Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.0019,
  "epssPercentile": 0.0873,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
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