net/mlx5: Fix possible use-after-free in async command interface
CVSS Skor
7.8
EPSS İhtimal
%0.2
Risk Skoru
0.0
Yayın
9 ay önce
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CVE-2022-50726 için toplanan üretici, dağıtım, yama ve güvenlik kaynağı kayıtlarını karşılaştırıp kanıt bağlantılı bir açıklama hazırlayalım.
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+0x23d/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 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014 Call Trace: <IRQ> dump_stack_lvl+0x57/0x7d print_report.cold+0x2d5/0x684 ? do_raw_spin_lock+0x23d/0x270 kasan_report+0xb1/0x1a0 ? do_raw_spin_lock+0x23d/0x270 do_raw_spin_lock+0x23d/0x270 ? rwlock_bug.part.0+0x90/0x90 ? __delete_object+0xb8/0x100 ? lock_downgrade+0x6e0/0x6e0 _raw_spin_lock_irqsave+0x43/0x60 ? __wake_up_common_lock+0xb9/0x140 __wake_up_common_lock+0xb9/0x140 ? __wake_up_common+0x650/0x650 ? destroy_tis_callback+0x53/0x70 [mlx5_core] ? kasan_set_track+0x21/0x30 ? destroy_tis_callback+0x53/0x70 [mlx5_core] ? kfree+0x1ba/0x520 ? do_raw_spin_unlock+0x54/0x220 mlx5_cmd_exec_cb_handler+0x136/0x1a0 [mlx5_core] ? mlx5_cmd_cleanup_async_ctx+0x220/0x220 [mlx5_core] ? mlx5_cmd_cleanup_async_ctx+0x220/0x220 [mlx5_core] mlx5_cmd_comp_handler+0x65a/0x12b0 [mlx5_core] ? dump_command+0xcc0/0xcc0 [mlx5_core] ? lockdep_hardirqs_on_prepare+0x400/0x400 ? cmd_comp_notifier+0x7e/0xb0 [mlx5_core] cmd_comp_notifier+0x7e/0xb0 [mlx5_core] atomic_notifier_call_chain+0xd7/0x1d0 mlx5_eq_async_int+0x3ce/0xa20 [mlx5_core] atomic_notifier_call_chain+0xd7/0x1d0 ? irq_release+0x140/0x140 [mlx5_core] irq_int_handler+0x19/0x30 [mlx5_core] __handle_irq_event_percpu+0x1f2/0x620 handle_irq_event+0xb2/0x1d0 handle_edge_irq+0x21e/0xb00 __common_interrupt+0x79/0x1a0 common_interrupt+0x78/0xa0 </IRQ> <TASK> asm_common_interrupt+0x22/0x40 RIP: 0010:default_idle+0x42/0x60 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 <c3> 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+0xcc/0x450 default_idle_call+0xec/0x450 do_idle+0x394/0x450 ? arch_cpu_idle_exit+0x40/0x40 ? do_idle+0x17/0x450 cpu_startup_entry+0x19/0x20 start_secondary+0x221/0x2b0 ? set_cpu_sibling_map+0x2070/0x2070 secondary_startup_64_no_verify+0xcd/0xdb </TASK> Allocated by task 49502: kasan_save_stack+0x1e/0x40 __kasan_kmalloc+0x81/0xa0 kvmalloc_node+0x48/0xe0 mlx5e_bulk_async_init+0x35/0x110 [mlx5_core] mlx5e_tls_priv_tx_list_cleanup+0x84/0x3e0 [mlx5_core] mlx5e_ktls_cleanup_tx+0x38f/0x760 [mlx5_core] mlx5e_cleanup_nic_tx+0xa7/0x100 [mlx5_core] mlx5e_detach_netdev+0x1c ---truncated---
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The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from various sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| 7.8 | CVSS V3_1 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | CVE CNA |
| 7.8 | CVSS V31 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | NVD |
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Zafiyet Dağılımı ve Saldırı Kalıpları (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2022-50726 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2022-50726 weaknesses.
Saldırı Vektörü ve Erişilebilirlik Karakteristiği
Resmi Kaynaklar ve Danışma Bültenleri
CVSS Vektör Radar Grafiği
7.8 / 10Vulnerability Scoring Details
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HYama durumu bilinmiyor
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