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 | — | Upgrade linux | May 15, 2025 | Jun 19, 2024 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Jun 19, 2024 |
| Suse | — | Upgrade kernel-source-vanillaUpgrade kselftests-kmp-64kbUpgrade gfs2-kmp-azureUpgrade kernel-sourceUpgrade kernel-develUpgrade dtb-alteraUpgrade kernel-obs-buildUpgrade reiserfs-kmp-azureUpgrade kernel-default-optionalUpgrade dtb-caviumUpgrade dtb-nvidiaUpgrade kernel-macrosUpgrade dtb-sprdUpgrade kernel-rt-develUpgrade kernel-kvmsmallUpgrade dlm-kmp-64kbUpgrade kernel-debug-vdsoUpgrade kernel-rt-extraUpgrade kernel-rt-livepatchUpgrade cluster-md-kmp-64kbUpgrade dtb-mediatekUpgrade kernel-rtUpgrade ocfs2-kmp-defaultUpgrade kernel-devel-azureUpgrade kernel-defaultUpgrade kernel-azureUpgrade kernel-default-base-rebuildUpgrade dtb-xilinxUpgrade kernel-syms-azureUpgrade dtb-rockchipUpgrade cluster-md-kmp-rtUpgrade dtb-amlogicUpgrade kernel-default-extraUpgrade kernel-azure-livepatch-develUpgrade kernel-default-vdsoUpgrade kernel-devel-rtUpgrade kernel-rt-vdsoUpgrade dtb-allwinnerUpgrade kernel-azure-develUpgrade dtb-armUpgrade dtb-qcomUpgrade kselftests-kmp-defaultUpgrade dlm-kmp-rtUpgrade dtb-exynosUpgrade ocfs2-kmp-64kbUpgrade reiserfs-kmp-defaultUpgrade kernel-default-livepatchUpgrade reiserfs-kmp-64kbUpgrade gfs2-kmp-64kbUpgrade kernel-syms-rtUpgrade kernel-rt_debugUpgrade kernel-kvmsmall-vdsoUpgrade kernel-64kbUpgrade dtb-socionextUpgrade kernel-rt_debug-vdsoUpgrade kernel-azure-extraUpgrade kernel-debug-livepatch-develUpgrade kernel-debug-develUpgrade ocfs2-kmp-azureUpgrade kernel-kvmsmall-livepatch-develUpgrade kernel-default-baseUpgrade dtb-lgUpgrade kernel-azure-optionalUpgrade kernel-rt-optionalUpgrade kernel-rt-livepatch-develUpgrade kernel-docs-htmlUpgrade kernel-64kb-optionalUpgrade kernel-64kb-livepatch-develUpgrade kernel-64kb-extraUpgrade dtb-apmUpgrade dtb-appleUpgrade cluster-md-kmp-defaultUpgrade dtb-broadcomUpgrade kernel-rt_debug-develUpgrade reiserfs-kmp-rtUpgrade kernel-zfcpdumpUpgrade kselftests-kmp-azureUpgrade kernel-rt_debug-livepatch-develUpgrade kernel-obs-qaUpgrade dlm-kmp-azureUpgrade gfs2-kmp-rtUpgrade dlm-kmp-defaultUpgrade kselftests-kmp-rtUpgrade kernel-default-livepatch-develUpgrade cluster-md-kmp-azureUpgrade kernel-symsUpgrade kernel-source-azureUpgrade kernel-debugUpgrade gfs2-kmp-defaultUpgrade dtb-renesasUpgrade dtb-marvellUpgrade dtb-amdUpgrade dtb-amazonUpgrade dtb-freescaleUpgrade ocfs2-kmp-rtUpgrade kernel-default-develUpgrade kernel-source-rtUpgrade kernel-azure-vdsoUpgrade kernel-docsUpgrade dtb-hisiliconUpgrade kernel-kvmsmall-develUpgrade kernel-64kb-devel | Jul 10, 2024 | Jun 19, 2024 |
| Ubuntu | — | Upgrade linux-image-6.8.0-1011-nvidia-64kUpgrade linux-image-6.8.0-1011-nvidia-lowlatencyUpgrade linux-image-6.8.0-1009-raspiUpgrade linux-image-ibm-lts-24.04Upgrade linux-image-6.8.0-1011-nvidiaUpgrade linux-image-oracle-64kUpgrade linux-image-6.8.0-1008-gkeUpgrade linux-image-6.8.0-1010-oracle-64kUpgrade linux-image-6.8.0-1010-oemUpgrade linux-image-virtualUpgrade linux-image-nvidia-64kUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-oem-24.04aUpgrade linux-image-kvmUpgrade linux-image-azure-fdeUpgrade linux-image-6.8.0-40-genericUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-6.8.0-1010-oracleUpgrade linux-image-gcpUpgrade linux-image-oracleUpgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-6.8.0-1012-gcpUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-awsUpgrade linux-image-6.8.0-1013-awsUpgrade linux-image-nvidia-6.8Upgrade linux-image-6.8.0-1012-azure-fdeUpgrade linux-image-6.8.0-40-lowlatency-64kUpgrade linux-image-generic-lpaeUpgrade linux-image-lowlatencyUpgrade linux-image-6.8.0-1012-azureUpgrade linux-image-lowlatency-64kUpgrade linux-image-oem-24.04Upgrade linux-image-ibmUpgrade linux-image-azureUpgrade linux-image-6.8.0-1011-nvidia-lowlatency-64kUpgrade linux-image-6.8.0-40-lowlatencyUpgrade linux-image-nvidiaUpgrade linux-image-generic-64kUpgrade linux-image-genericUpgrade linux-image-gkeUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-6.8.0-40-generic-64kUpgrade linux-image-ibm-classicUpgrade linux-image-6.8.0-1010-ibmUpgrade linux-image-raspi | 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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