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