{"id":"CVE-2022-50002","state":"PUBLISHED","title":"net/mlx5: LAG, fix logic over MLX5_LAG_FLAG_NDEVS_READY","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","publishedAt":"2025-06-18T11:01:02.653Z","updatedAt":"2026-05-11T19:10:49.568Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8a66e45859797e5dd77ff17dd37781f99d5f5b9b","status":"affected","lessThan":"4c040acf5744e87a7b3490f9ec8bedd0d15c9f29","versionType":"git"},{"version":"8a66e45859797e5dd77ff17dd37781f99d5f5b9b","status":"affected","lessThan":"a6e675a66175869b7d87c0e1dd0ddf93e04f8098","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.14","versionType":"semver"},{"version":"5.19.6","status":"unaffected","lessThanOrEqual":"5.19.*","versionType":"semver"},{"version":"6.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c"]}],"references":["https://git.kernel.org/stable/c/4c040acf5744e87a7b3490f9ec8bedd0d15c9f29","https://git.kernel.org/stable/c/a6e675a66175869b7d87c0e1dd0ddf93e04f8098"],"weaknesses":[],"ingestedAt":"2026-10-29T20:05:26.763Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2022/50xxx/CVE-2022-50002.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-50002","state":"PUBLISHED","datePublished":"2025-06-18T11:01:02.653Z","dateUpdated":"2026-05-11T19:10:49.568Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-06-18T10:57:27.387Z"},"containers":{"cna":{"title":"net/mlx5: LAG, fix logic over MLX5_LAG_FLAG_NDEVS_READY","descriptions":[{"lang":"en","value":"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"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8a66e45859797e5dd77ff17dd37781f99d5f5b9b","status":"affected","lessThan":"4c040acf5744e87a7b3490f9ec8bedd0d15c9f29","versionType":"git"},{"version":"8a66e45859797e5dd77ff17dd37781f99d5f5b9b","status":"affected","lessThan":"a6e675a66175869b7d87c0e1dd0ddf93e04f8098","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.14","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.14","versionType":"semver"},{"version":"5.19.6","status":"unaffected","lessThanOrEqual":"5.19.*","versionType":"semver"},{"version":"6.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/4c040acf5744e87a7b3490f9ec8bedd0d15c9f29"},{"url":"https://git.kernel.org/stable/c/a6e675a66175869b7d87c0e1dd0ddf93e04f8098"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T19:10:49.568Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"5.19.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.14","versionEndExcluding":"6.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}