In the Linux kernel, the following vulnerability has been resolved:
net/mlx5: Reload only IB representors upon lag disable/enable
On lag disable, the bond IB device along with all of its representors are destroyed, and then the slaves' representors get reloaded.
In case the slave IB representor load fails, the eswitch error flow unloads all representors, including ethernet representors, where the netdevs get detached and removed from lag bond. Such flow is inaccurate as the lag driver is not responsible for loading/unloading ethernet representors. Furthermore, the flow described above begins by holding lag lock to prevent bond changes during disable flow. However, when reaching the ethernet representors detachment from lag, the lag lock is required again, triggering the following deadlock:
Call trace: __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] mlx5e_detach_netdev+0x6c/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] mlx5_disable_lag+0x130/0x138 [mlx5_core] mlx5_lag_disable_change+0x6c/0x70 [mlx5_core] // hold ldev->lock 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 netlink_rcv_skb+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
Thus, upon lag enable/disable, load and unload only the IB representors of the slaves preventing the deadlock mentioned above.
While at it, refactor the mlx5_esw_offloads_rep_load() function to have a static helper method for its internal logic, in symmetry with the representor unload design.
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | No solution existsUpgrade linux | May 15, 2025 | Jun 19, 2024 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Jun 19, 2024 |
| Suse | — | Upgrade kernel-64kb-develUpgrade kernel-debug-develUpgrade kernel-default-livepatch-develUpgrade dtb-lgUpgrade dlm-kmp-azureUpgrade kernel-azure-optionalUpgrade kernel-default-baseUpgrade kernel-obs-qaUpgrade kernel-rt_debug-develUpgrade kernel-rt_debug-livepatch-develUpgrade kernel-zfcpdumpUpgrade kernel-64kb-extraUpgrade cluster-md-kmp-azureUpgrade kernel-docsUpgrade kselftests-kmp-azureUpgrade dlm-kmp-defaultUpgrade reiserfs-kmp-rtUpgrade kernel-kvmsmall-livepatch-develUpgrade kernel-debug-livepatch-develUpgrade ocfs2-kmp-azureUpgrade dtb-broadcomUpgrade kernel-rt-optionalUpgrade dtb-appleUpgrade kernel-64kb-livepatch-develUpgrade reiserfs-kmp-defaultUpgrade kselftests-kmp-rtUpgrade cluster-md-kmp-defaultUpgrade kernel-rt-livepatch-develUpgrade dtb-hisiliconUpgrade gfs2-kmp-64kbUpgrade kernel-kvmsmall-vdsoUpgrade kernel-kvmsmall-develUpgrade kernel-syms-rtUpgrade kernel-64kb-optionalUpgrade dtb-apmUpgrade gfs2-kmp-rtUpgrade kernel-docs-htmlUpgrade dtb-renesasUpgrade gfs2-kmp-defaultUpgrade ocfs2-kmp-64kbUpgrade kernel-rt_debugUpgrade kernel-default-livepatchUpgrade kernel-rt_debug-vdsoUpgrade kernel-source-azureUpgrade kernel-64kbUpgrade kernel-symsUpgrade ocfs2-kmp-rtUpgrade dtb-amazonUpgrade kernel-azure-extraUpgrade kernel-azure-vdsoUpgrade kernel-debugUpgrade dtb-socionextUpgrade kernel-default-develUpgrade reiserfs-kmp-64kbUpgrade kernel-source-rtUpgrade dtb-amdUpgrade dtb-freescaleUpgrade dtb-marvellUpgrade kselftests-kmp-64kbUpgrade kernel-source-vanillaUpgrade kernel-develUpgrade kernel-rt-vdsoUpgrade kernel-devel-rtUpgrade kernel-default-vdsoUpgrade dtb-exynosUpgrade kernel-azure-develUpgrade kernel-sourceUpgrade kernel-debug-vdsoUpgrade kernel-default-extraUpgrade kernel-defaultUpgrade cluster-md-kmp-64kbUpgrade dlm-kmp-64kbUpgrade kernel-rt-livepatchUpgrade kernel-rt-develUpgrade kernel-kvmsmallUpgrade kernel-rt-extraUpgrade dtb-nvidiaUpgrade dtb-mediatekUpgrade ocfs2-kmp-defaultUpgrade kernel-rtUpgrade kernel-macrosUpgrade dtb-caviumUpgrade kernel-devel-azureUpgrade cluster-md-kmp-rtUpgrade kernel-azureUpgrade dtb-rockchipUpgrade kernel-default-base-rebuildUpgrade dtb-amlogicUpgrade kernel-syms-azureUpgrade dtb-xilinxUpgrade dlm-kmp-rtUpgrade kselftests-kmp-defaultUpgrade dtb-qcomUpgrade dtb-armUpgrade dtb-allwinnerUpgrade dtb-sprdUpgrade dtb-alteraUpgrade gfs2-kmp-azureUpgrade kernel-azure-livepatch-develUpgrade reiserfs-kmp-azureUpgrade kernel-default-optionalUpgrade kernel-obs-build | Jul 10, 2024 | Jun 19, 2024 |
| Ubuntu | — | Upgrade linux-image-6.8.0-1012-azure-fdeUpgrade linux-image-6.8.0-1013-awsUpgrade linux-image-generic-lpaeUpgrade linux-image-nvidia-6.8Upgrade linux-image-6.8.0-1011-nvidia-lowlatency-64kUpgrade linux-image-ibmUpgrade linux-image-6.8.0-40-generic-64kUpgrade linux-image-oem-24.04Upgrade linux-image-nvidiaUpgrade linux-image-6.8.0-1012-azureUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-raspiUpgrade linux-image-azureUpgrade linux-image-genericUpgrade linux-image-6.8.0-1010-ibmUpgrade linux-image-gkeUpgrade linux-image-6.8.0-40-lowlatencyUpgrade linux-image-ibm-classicUpgrade linux-image-generic-64kUpgrade linux-image-lowlatency-64kUpgrade linux-image-6.8.0-40-lowlatency-64kUpgrade linux-image-lowlatencyUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-gcpUpgrade linux-image-6.8.0-40-genericUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-nvidia-lowlatencyUpgrade linux-image-nvidia-64kUpgrade linux-image-6.8.0-1010-oemUpgrade linux-image-6.8.0-1012-gcpUpgrade linux-image-awsUpgrade linux-image-oracle-64kUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-6.8.0-1008-gkeUpgrade linux-image-6.8.0-1011-nvidia-lowlatencyUpgrade linux-image-6.8.0-1010-oracle-64kUpgrade linux-image-azure-fdeUpgrade linux-image-ibm-lts-24.04Upgrade linux-image-6.8.0-1010-oracleUpgrade linux-image-6.8.0-1011-nvidia-64kUpgrade linux-image-kvmUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-virtualUpgrade linux-image-6.8.0-1009-raspiUpgrade linux-image-6.8.0-1011-nvidiaUpgrade linux-image-oem-24.04aUpgrade linux-image-oracle | Aug 9, 2024 | Jun 19, 2024 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Feb 3, 2025 | Jun 19, 2024 |
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