{"cve":"CVE-2022-50002","nvd":{"published":"2025-06-18T11:15:28.063","modified":"2026-06-17T05:22:31.917","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5: LAG, fix logic over MLX5_LAG_FLAG_NDEVS_READY\n\nOnly set MLX5_LAG_FLAG_NDEVS_READY if both netdevices are registered.\nDoing so guarantees that both ldev->pf[MLX5_LAG_P0].dev and\nldev->pf[MLX5_LAG_P1].dev have valid pointers when\nMLX5_LAG_FLAG_NDEVS_READY is set.\n\nThe core issue is asymmetry in setting MLX5_LAG_FLAG_NDEVS_READY and\nclearing it. Setting it is done wrongly when both\nldev->pf[MLX5_LAG_P0].dev and ldev->pf[MLX5_LAG_P1].dev are set;\nclearing it is done right when either of ldev->pf[i].netdev is cleared.\n\nConsider the following scenario:\n1. PF0 loads and sets ldev->pf[MLX5_LAG_P0].dev to a valid pointer\n2. PF1 loads and sets both ldev->pf[MLX5_LAG_P1].dev and\n   ldev->pf[MLX5_LAG_P1].netdev with valid pointers. This results in\n   MLX5_LAG_FLAG_NDEVS_READY is set.\n3. PF0 is unloaded before setting dev->pf[MLX5_LAG_P0].netdev.\n   MLX5_LAG_FLAG_NDEVS_READY remains set.\n\nFurther execution of mlx5_do_bond() will result in null pointer\ndereference when calling mlx5_lag_is_multipath()\n\nThis patch fixes the following call trace actually encountered:\n\n[ 1293.475195] BUG: kernel NULL pointer dereference, address: 00000000000009a8\n[ 1293.478756] #PF: supervisor read access in kernel mode\n[ 1293.481320] #PF: error_code(0x0000) - not-present page\n[ 1293.483686] PGD 0 P4D 0\n[ 1293.484434] Oops: 0000 [#1] SMP PTI\n[ 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\n[ 1293.488039] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014\n[ 1293.490836] Workqueue: mlx5_lag mlx5_do_bond_work [mlx5_core]\n[ 1293.492448] RIP: 0010:mlx5_lag_is_multipath+0x5/0x50 [mlx5_core]\n[ 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\n[ 1293.498673] RSP: 0018:ffff88811b2fbe40 EFLAGS: 00010202\n[ 1293.500152] RAX: ffff88818a94e1c0 RBX: ffff888165eca6c0 RCX: 0000000000000000\n[ 1293.501841] RDX: 0000000000000001 RSI: ffff88818a94e1c0 RDI: 0000000000000000\n[ 1293.503585] RBP: 0000000000000000 R08: ffff888119886740 R09: ffff888165eca73c\n[ 1293.505286] R10: 0000000000000018 R11: 0000000000000018 R12: ffff88818a94e1c0\n[ 1293.506979] R13: ffff888112729800 R14: 0000000000000000 R15: ffff888112729858\n[ 1293.508753] FS:  0000000000000000(0000) GS:ffff88852cc40000(0000) knlGS:0000000000000000\n[ 1293.510782] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 1293.512265] CR2: 00000000000009a8 CR3: 00000001032d4002 CR4: 0000000000370ea0\n[ 1293.514001] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[ 1293.515806] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-476"],"references":["https://git.kernel.org/stable/c/4c040acf5744e87a7b3490f9ec8bedd0d15c9f29","https://git.kernel.org/stable/c/a6e675a66175869b7d87c0e1dd0ddf93e04f8098"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:03:23.287444849+00:00"},"epss":{"cve":"CVE-2022-50002","score":0.00235,"percentile":0.14562,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}