CVE-2022-50002

MEDIUM
Published Jun 18, 2025 Modified Nov 14, 2025 CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: net/mlx5: LAG, fix logic over MLX5_LAG_FLAG_NDEVS_READY Only set MLX5_LAG_FLAG_NDEVS_READY if both netdevices are registered. Doing so guarantees that both ldev->pf[MLX5_LAG_P0].dev and ldev->pf[MLX5_LAG_P1].dev have valid pointers when MLX5_LAG_FLAG_NDEVS_READY is set. The core issue is asymmetry in setting MLX5_LAG_FLAG_NDEVS_READY and clearing it. Setting it is done wrongly when both ldev->pf[MLX5_LAG_P0].dev and ldev->pf[MLX5_LAG_P1].dev are set; clearing it is done right when either of ldev->pf[i].netdev is cleared. Consider the following scenario: 1. PF0 loads and sets ldev->pf[MLX5_LAG_P0].dev to a valid pointer 2. PF1 loads and sets both ldev->pf[MLX5_LAG_P1].dev and ldev->pf[MLX5_LAG_P1].netdev with valid pointers. This results in MLX5_LAG_FLAG_NDEVS_READY is set. 3. PF0 is unloaded before setting dev->pf[MLX5_LAG_P0].netdev. MLX5_LAG_FLAG_NDEVS_READY remains set. Further execution of mlx5_do_bond() will result in null pointer dereference when calling mlx5_lag_is_multipath() This patch fixes the following call trace actually encountered: [ 1293.475195] BUG: kernel NULL pointer dereference, address: 00000000000009a8 [ 1293.478756] #PF: supervisor read access in kernel mode [ 1293.481320] #PF: error_code(0x0000) - not-present page [ 1293.483686] PGD 0 P4D 0 [ 1293.484434] Oops: 0000 [#1] SMP PTI [ 1293.485377] CPU: 1 PID: 23690 Comm: kworker/u16:2 Not tainted 5.18.0-rc5_for_upstream_min_debug_2022_05_05_10_13 #1 [ 1293.488039] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014 [ 1293.490836] Workqueue: mlx5_lag mlx5_do_bond_work [mlx5_core] [ 1293.492448] RIP: 0010:mlx5_lag_is_multipath+0x5/0x50 [mlx5_core] [ 1293.494044] Code: e8 70 40 ff e0 48 8b 14 24 48 83 05 5c 1a 1b 00 01 e9 19 ff ff ff 48 83 05 47 1a 1b 00 01 eb d7 0f 1f 44 00 00 0f 1f 44 00 00 <48> 8b 87 a8 09 00 00 48 85 c0 74 26 48 83 05 a7 1b 1b 00 01 41 b8 [ 1293.498673] RSP: 0018:ffff88811b2fbe40 EFLAGS: 00010202 [ 1293.500152] RAX: ffff88818a94e1c0 RBX: ffff888165eca6c0 RCX: 0000000000000000 [ 1293.501841] RDX: 0000000000000001 RSI: ffff88818a94e1c0 RDI: 0000000000000000 [ 1293.503585] RBP: 0000000000000000 R08: ffff888119886740 R09: ffff888165eca73c [ 1293.505286] R10: 0000000000000018 R11: 0000000000000018 R12: ffff88818a94e1c0 [ 1293.506979] R13: ffff888112729800 R14: 0000000000000000 R15: ffff888112729858 [ 1293.508753] FS: 0000000000000000(0000) GS:ffff88852cc40000(0000) knlGS:0000000000000000 [ 1293.510782] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1293.512265] CR2: 00000000000009a8 CR3: 00000001032d4002 CR4: 0000000000370ea0 [ 1293.514001] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1293.515806] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

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CVSS v3.1 Score

5.5
MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-476 CWE-476

Affected Products

Vendor Product
linux linux_kernel
linux linux_kernel
linux linux_kernel

References

Frequently Asked Questions

What is CVE-2022-50002? +
In the Linux kernel, the following vulnerability has been resolved: net/mlx5: LAG, fix logic over MLX5_LAG_FLAG_NDEVS_READY Only set MLX5_LAG_FLAG_NDEVS_READY if both netdevices are registered. Doing so guarantees that both ldev->pf[MLX5_LAG_P0].dev and ldev->pf[MLX5_LAG_P1].dev have valid pointers when MLX5_LAG_FLAG_NDEVS_READY is set. The core issue is asymmetry in setting MLX5_LAG_FLAG_NDEVS_READY and clearing it. Setting it is done wrongly when both ldev->pf[MLX5_LAG_P0].dev and ldev->pf[MLX5_LAG_P1].dev are set; clearing it is done right when either of ldev->pf[i].netdev is cleared. Consider the following scenario: 1. PF0 loads and sets ldev->pf[MLX5_LAG_P0].dev to a valid pointer 2. PF1 loads and sets both ldev->pf[MLX5_LAG_P1].dev and ldev->pf[MLX5_LAG_P1].netdev with valid pointers. This results in MLX5_LAG_FLAG_NDEVS_READY is set. 3. PF0 is unloaded before setting dev->pf[MLX5_LAG_P0].netdev. MLX5_LAG_FLAG_NDEVS_READY remains set. Further execution of mlx5_do_bond() will result in null pointer dereference when calling mlx5_lag_is_multipath() This patch fixes the following call trace actually encountered: [ 1293.475195] BUG: kernel NULL pointer dereference, address: 00000000000009a8 [ 1293.478756] #PF: supervisor read access in kernel mode [ 1293.481320] #PF: error_code(0x0000) - not-present page [ 1293.483686] PGD 0 P4D 0 [ 1293.484434] Oops: 0000 [#1] SMP PTI [ 1293.485377] CPU: 1 PID: 23690 Comm: kworker/u16:2 Not tainted 5.18.0-rc5_for_upstream_min_debug_2022_05_05_10_13 #1 [ 1293.488039] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014 [ 1293.490836] Workqueue: mlx5_lag mlx5_do_bond_work [mlx5_core] [ 1293.492448] RIP: 0010:mlx5_lag_is_multipath+0x5/0x50 [mlx5_core] [ 1293.494044] Code: e8 70 40 ff e0 48 8b 14 24 48 83 05 5c 1a 1b 00 01 e9 19 ff ff ff 48 83 05 47 1a 1b 00 01 eb d7 0f 1f 44 00 00 0f 1f 44 00 00 <48> 8b 87 a8 09 00 00 48 85 c0 74 26 48 83 05 a7 1b 1b 00 01 41 b8 [ 1293.498673] RSP: 0018:ffff88811b2fbe40 EFLAGS: 00010202 [ 1293.500152] RAX: ffff88818a94e1c0 RBX: ffff888165eca6c0 RCX: 0000000000000000 [ 1293.501841] RDX: 0000000000000001 RSI: ffff88818a94e1c0 RDI: 0000000000000000 [ 1293.503585] RBP: 0000000000000000 R08: ffff888119886740 R09: ffff888165eca73c [ 1293.505286] R10: 0000000000000018 R11: 0000000000000018 R12: ffff88818a94e1c0 [ 1293.506979] R13: ffff888112729800 R14: 0000000000000000 R15: ffff888112729858 [ 1293.508753] FS: 0000000000000000(0000) GS:ffff88852cc40000(0000) knlGS:0000000000000000 [ 1293.510782] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1293.512265] CR2: 00000000000009a8 CR3: 00000001032d4002 CR4: 0000000000370ea0 [ 1293.514001] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1293.515806] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 It has a CVSS v3.1 base score of 5.5 (MEDIUM).
How severe is CVE-2022-50002? +
CVE-2022-50002 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.
What products are affected by CVE-2022-50002? +
CVE-2022-50002 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2022-50002? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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