CVE-2024-38557

{"id": "CVE-2024-38557", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "published": "2024-06-19T14:15:15.900", "references": [{"url": "https://git.kernel.org/stable/c/0f06228d4a2dcc1fca5b3ddb0eefa09c05b102c4", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/0f320f28f54b1b269a755be2e3fb3695e0b80b07", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/e93fc8d959e56092e2eca1e5511c2d2f0ad6807a", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/f03c714a0fdd1f93101a929d0e727c28a66383fc", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-667"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5: Reload only IB representors upon lag disable/enable\n\nOn lag disable, the bond IB device along with all of its\nrepresentors are destroyed, and then the slaves' representors get reloaded.\n\nIn case the slave IB representor load fails, the eswitch error flow\nunloads all representors, including ethernet representors, where the\nnetdevs get detached and removed from lag bond. Such flow is inaccurate\nas the lag driver is not responsible for loading/unloading ethernet\nrepresentors. Furthermore, the flow described above begins by holding\nlag lock to prevent bond changes during disable flow. However, when\nreaching the ethernet representors detachment from lag, the lag lock is\nrequired again, triggering the following deadlock:\n\nCall trace:\n__switch_to+0xf4/0x148\n__schedule+0x2c8/0x7d0\nschedule+0x50/0xe0\nschedule_preempt_disabled+0x18/0x28\n__mutex_lock.isra.13+0x2b8/0x570\n__mutex_lock_slowpath+0x1c/0x28\nmutex_lock+0x4c/0x68\nmlx5_lag_remove_netdev+0x3c/0x1a0 [mlx5_core]\nmlx5e_uplink_rep_disable+0x70/0xa0 [mlx5_core]\nmlx5e_detach_netdev+0x6c/0xb0 [mlx5_core]\nmlx5e_netdev_change_profile+0x44/0x138 [mlx5_core]\nmlx5e_netdev_attach_nic_profile+0x28/0x38 [mlx5_core]\nmlx5e_vport_rep_unload+0x184/0x1b8 [mlx5_core]\nmlx5_esw_offloads_rep_load+0xd8/0xe0 [mlx5_core]\nmlx5_eswitch_reload_reps+0x74/0xd0 [mlx5_core]\nmlx5_disable_lag+0x130/0x138 [mlx5_core]\nmlx5_lag_disable_change+0x6c/0x70 [mlx5_core] // hold ldev->lock\nmlx5_devlink_eswitch_mode_set+0xc0/0x410 [mlx5_core]\ndevlink_nl_cmd_eswitch_set_doit+0xdc/0x180\ngenl_family_rcv_msg_doit.isra.17+0xe8/0x138\ngenl_rcv_msg+0xe4/0x220\nnetlink_rcv_skb+0x44/0x108\ngenl_rcv+0x40/0x58\nnetlink_unicast+0x198/0x268\nnetlink_sendmsg+0x1d4/0x418\nsock_sendmsg+0x54/0x60\n__sys_sendto+0xf4/0x120\n__arm64_sys_sendto+0x30/0x40\nel0_svc_common+0x8c/0x120\ndo_el0_svc+0x30/0xa0\nel0_svc+0x20/0x30\nel0_sync_handler+0x90/0xb8\nel0_sync+0x160/0x180\n\nThus, upon lag enable/disable, load and unload only the IB representors\nof the slaves preventing the deadlock mentioned above.\n\nWhile at it, refactor the mlx5_esw_offloads_rep_load() function to have\na static helper method for its internal logic, in symmetry with the\nrepresentor unload design."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/mlx5: recarga solo los representantes IB al desactivar/activar el retraso. Al desactivar el retraso, el dispositivo IB de enlace junto con todos sus representantes se destruyen y luego se recargan los representantes de los esclavos. . En caso de que falle la carga del representante IB esclavo, el flujo de error de conmutaci\u00f3n descarga todos los representantes, incluidos los representantes de Ethernet, donde los netdevs se desconectan y se eliminan del v\u00ednculo de retraso. Dicho flujo es inexacto ya que el controlador de retraso no es responsable de cargar/descargar representantes de Ethernet. Adem\u00e1s, el flujo descrito anteriormente comienza manteniendo el bloqueo de retardo para evitar cambios de uni\u00f3n durante la desactivaci\u00f3n del flujo. Sin embargo, cuando se alcanza la separaci\u00f3n del retraso de los representantes de Ethernet, se requiere nuevamente el bloqueo del retraso, lo que desencadena el siguiente punto muerto: Seguimiento de llamadas: __switch_to+0xf4/0x148 __schedule+0x2c8/0x7d0 Schedule+0x50/0xe0 Schedule_preempt_disabled+0x18/0x28 __mutex_lock.isra. 13+0x2b8/0x570 __mutex_lock_slowpath+0x1c/0x28 mutex_lock+0x4c/0x68 mlx5_lag_remove_netdev+0x3c/0x1a0 [mlx5_core] mlx5e_uplink_rep_disable+0x70/0xa0 [mlx5_core] 6c/0xb0 [mlx5_core] mlx5e_netdev_change_profile+0x44/0x138 [mlx5_core] mlx5e_netdev_attach_nic_profile+0x28 /0x38 [mlx5_core] mlx5e_vport_rep_unload+0x184/0x1b8 [mlx5_core] mlx5_esw_offloads_rep_load+0xd8/0xe0 [mlx5_core] mlx5_eswitch_reload_reps+0x74/0xd0 [mlx5_core] 138 [mlx5_core] mlx5_lag_disable_change+0x6c/0x70 [mlx5_core] // mantenga presionado ldev- >bloquear mlx5_devlink_eswitch_mode_set+0xc0/0x410 [mlx5_core] devlink_nl_cmd_eswitch_set_doit+0xdc/0x180 genl_family_rcv_msg_doit.isra.17+0xe8/0x138 genl_rcv_msg+0xe4/0x220 b+0x44/0x108 genl_rcv+0x40/0x58 netlink_unicast+0x198/0x268 netlink_sendmsg+0x1d4/0x418 sock_sendmsg +0x54/0x60 __sys_sendto+0xf4/0x120 __arm64_sys_sendto+0x30/0x40 el0_svc_common+0x8c/0x120 do_el0_svc+0x30/0xa0 el0_svc+0x20/0x30 el0_sync_handler+0x90/0xb8 el0_sync+0x160/0x180 Por lo tanto, tras el retraso habilitar/deshabilitar, cargar y descargar s\u00f3lo los representantes IB de los esclavos evitan el punto muerto mencionado anteriormente. Mientras lo hace, refactorice la funci\u00f3n mlx5_esw_offloads_rep_load() para tener un m\u00e9todo auxiliar est\u00e1tico para su l\u00f3gica interna, en simetr\u00eda con el dise\u00f1o de descarga del representante."}], "lastModified": "2024-08-29T02:23:35.880", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "92AC1231-0841-463A-9EA5-8770AEF0714B", "versionEndExcluding": "6.6.33", "versionStartIncluding": "5.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "80550309-67AB-4FD1-AC07-3DED5C4F01B2", "versionEndExcluding": "6.8.12", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E07124C1-19E8-4D21-828D-9932A01D3011", "versionEndExcluding": "6.9.3", "versionStartIncluding": "6.9"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}