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-default-develUpgrade kernel-source-azureUpgrade kernel-kvmsmall-vdsoUpgrade kernel-source-rtUpgrade kernel-symsUpgrade ocfs2-kmp-rtUpgrade cluster-md-kmp-azureUpgrade dtb-hisiliconUpgrade dlm-kmp-defaultUpgrade kernel-syms-rtUpgrade reiserfs-kmp-defaultUpgrade gfs2-kmp-rtUpgrade kselftests-kmp-rtUpgrade gfs2-kmp-64kbUpgrade kernel-kvmsmall-develUpgrade kernel-64kb-develUpgrade kernel-rt_debugUpgrade dtb-freescaleUpgrade dtb-amazonUpgrade dtb-amdUpgrade ocfs2-kmp-azureUpgrade kernel-default-baseUpgrade kernel-docsUpgrade dtb-lgUpgrade dtb-apmUpgrade kernel-rt-livepatch-develUpgrade dtb-appleUpgrade kernel-azure-optionalUpgrade kernel-64kb-extraUpgrade kernel-64kb-livepatch-develUpgrade kernel-rt-optionalUpgrade kernel-64kb-optionalUpgrade cluster-md-kmp-defaultUpgrade dtb-broadcomUpgrade kernel-docs-htmlUpgrade kernel-debug-livepatch-develUpgrade kselftests-kmp-azureUpgrade reiserfs-kmp-rtUpgrade kernel-zfcpdumpUpgrade kernel-default-livepatch-develUpgrade kernel-rt_debug-livepatch-develUpgrade dlm-kmp-azureUpgrade kernel-obs-qaUpgrade kernel-rt_debug-develUpgrade kernel-kvmsmall-livepatch-develUpgrade kernel-debug-develUpgrade kernel-azure-vdsoUpgrade kernel-azure-extraUpgrade kernel-default-livepatchUpgrade kernel-64kbUpgrade kernel-rt_debug-vdsoUpgrade dtb-renesasUpgrade gfs2-kmp-defaultUpgrade dtb-socionextUpgrade ocfs2-kmp-64kbUpgrade kernel-debugUpgrade dtb-marvellUpgrade reiserfs-kmp-64kbUpgrade cluster-md-kmp-rtUpgrade kernel-rt-vdsoUpgrade kernel-devel-rtUpgrade dtb-amlogicUpgrade kselftests-kmp-64kbUpgrade kernel-obs-buildUpgrade kernel-develUpgrade kernel-default-optionalUpgrade kernel-azure-livepatch-develUpgrade dtb-exynosUpgrade kernel-default-vdsoUpgrade dtb-allwinnerUpgrade dlm-kmp-rtUpgrade cluster-md-kmp-64kbUpgrade kernel-rtUpgrade dtb-caviumUpgrade kernel-macrosUpgrade ocfs2-kmp-defaultUpgrade dtb-mediatekUpgrade kernel-kvmsmallUpgrade kernel-devel-azureUpgrade dtb-nvidiaUpgrade dlm-kmp-64kbUpgrade kernel-rt-develUpgrade kernel-debug-vdsoUpgrade dtb-sprdUpgrade kernel-sourceUpgrade kernel-defaultUpgrade kernel-default-extraUpgrade kernel-rt-livepatchUpgrade kernel-rt-extraUpgrade dtb-armUpgrade kselftests-kmp-defaultUpgrade dtb-qcomUpgrade kernel-azure-develUpgrade kernel-syms-azureUpgrade kernel-default-base-rebuildUpgrade kernel-azureUpgrade dtb-xilinxUpgrade dtb-rockchipUpgrade gfs2-kmp-azureUpgrade kernel-source-vanillaUpgrade dtb-alteraUpgrade reiserfs-kmp-azure | Jul 10, 2024 | Jun 19, 2024 |
| Ubuntu | — | Upgrade linux-image-6.8.0-1012-azure-fdeUpgrade linux-image-nvidia-6.8Upgrade linux-image-lowlatencyUpgrade linux-image-6.8.0-1012-azureUpgrade linux-image-oem-24.04Upgrade linux-image-6.8.0-1011-nvidia-lowlatency-64kUpgrade linux-image-6.8.0-40-lowlatency-64kUpgrade linux-image-gkeUpgrade linux-image-6.8.0-40-generic-64kUpgrade linux-image-azureUpgrade linux-image-lowlatency-64kUpgrade linux-image-6.8.0-1010-ibmUpgrade linux-image-6.8.0-1013-awsUpgrade linux-image-generic-64kUpgrade linux-image-ibmUpgrade linux-image-ibm-classicUpgrade linux-image-nvidiaUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-raspiUpgrade linux-image-generic-lpaeUpgrade linux-image-6.8.0-40-lowlatencyUpgrade linux-image-genericUpgrade linux-image-oem-24.04aUpgrade linux-image-6.8.0-1011-nvidia-64kUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-ibm-lts-24.04Upgrade linux-image-6.8.0-1010-oracle-64kUpgrade linux-image-nvidia-64kUpgrade linux-image-awsUpgrade linux-image-gcpUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-6.8.0-40-genericUpgrade linux-image-azure-fdeUpgrade linux-image-6.8.0-1011-nvidia-lowlatencyUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-oracle-64kUpgrade linux-image-virtualUpgrade linux-image-6.8.0-1008-gkeUpgrade linux-image-6.8.0-1011-nvidiaUpgrade linux-image-6.8.0-1009-raspiUpgrade linux-image-kvmUpgrade linux-image-6.8.0-1010-oemUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-oracleUpgrade linux-image-6.8.0-1012-gcpUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-6.8.0-1010-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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