In the Linux kernel, the following vulnerability has been resolved:
net/mlx5: Fix bridge mode operations when there are no VFs
Currently, trying to set the bridge mode attribute when numvfs=0 leads to a crash:
bridge link set dev eth2 hwmode vepa
[ 168.967392] BUG: kernel NULL pointer dereference, address: 0000000000000030 [...] [ 168.969989] RIP: 0010:mlx5_add_flow_rules+0x1f/0x300 [mlx5_core] [...] [ 168.976037] Call Trace: [ 168.976188] <TASK> [ 168.978620] _mlx5_eswitch_set_vepa_locked+0x113/0x230 [mlx5_core] [ 168.979074] mlx5_eswitch_set_vepa+0x7f/0xa0 [mlx5_core] [ 168.979471] rtnl_bridge_setlink+0xe9/0x1f0 [ 168.979714] rtnetlink_rcv_msg+0x159/0x400 [ 168.980451] netlink_rcv_skb+0x54/0x100 [ 168.980675] netlink_unicast+0x241/0x360 [ 168.980918] netlink_sendmsg+0x1f6/0x430 [ 168.981162] ____sys_sendmsg+0x3bb/0x3f0 [ 168.982155] ___sys_sendmsg+0x88/0xd0 [ 168.985036] __sys_sendmsg+0x59/0xa0 [ 168.985477] do_syscall_64+0x79/0x150 [ 168.987273] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 168.987773] RIP: 0033:0x7f8f7950f917
(esw->fdb_table.legacy.vepa_fdb is null)
The bridge mode is only relevant when there are multiple functions per port. Therefore, prevent setting and getting this setting when there are no VFs.
Note that after this change, there are no settings to change on the PF interface using `bridge link` when there are no VFs, so the interface no longer appears in the `bridge link` output.
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 |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel-debuginfo-common-x86_64Upgrade kernel-tools-debuginfoUpgrade python3-perf-debuginfoUpgrade kernel-libbpf-staticUpgrade kernel-modules-extraUpgrade kernelUpgrade kernel-libbpf-develUpgrade bpftool-debuginfoUpgrade python3-perfUpgrade kernel-toolsUpgrade kernel-develUpgrade kernel-debuginfo-common-aarch64Upgrade bpftoolUpgrade kernel-modules-extra-commonUpgrade kernel-libbpfUpgrade kernel-headersUpgrade kernel-tools-develUpgrade perf-debuginfoUpgrade perfUpgrade kernel-livepatch-6.1.111-120.187Upgrade kernel-debuginfo | Oct 16, 2025 | Sep 27, 2024 |
| Debian | — | Upgrade linuxUpgrade linux-6.1 | Oct 7, 2024 | Sep 27, 2024 |
| Huawei Euleros 2_0_sp11 | — | Upgrade kernel-abi-stablelistsUpgrade kernel-tools-libsUpgrade bpftoolUpgrade kernel-toolsUpgrade python3-perfUpgrade kernel | Dec 12, 2024 | Sep 27, 2024 |
| Huawei Euleros 2_0_sp12 | — | Upgrade python3-perfUpgrade kernelUpgrade kernel-abi-stablelistsUpgrade kernel-toolsUpgrade bpftoolUpgrade kernel-tools-libs | Dec 12, 2024 | Sep 27, 2024 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Sep 27, 2024 |
| Suse | — | Upgrade kernel-sourceUpgrade kernel-obs-buildUpgrade reiserfs-kmp-azureUpgrade dtb-sprdUpgrade kernel-rt-optionalUpgrade ocfs2-kmp-64kbUpgrade gfs2-kmp-defaultUpgrade kernel-azure-optionalUpgrade dtb-alteraUpgrade kernel-64kb-extraUpgrade dtb-broadcomUpgrade kernel-devel-azureUpgrade kernel-rtUpgrade kernel-syms-azureUpgrade kernel-default-livepatchUpgrade kernel-rt-livepatchUpgrade ocfs2-kmp-defaultUpgrade kernel-default-develUpgrade dtb-caviumUpgrade gfs2-kmp-azureUpgrade kernel-default-base-rebuildUpgrade kernel-64kbUpgrade kernel-source-vanillaUpgrade kselftests-kmp-64kbUpgrade kernel-debugUpgrade dtb-xilinxUpgrade dtb-hisiliconUpgrade dtb-lgUpgrade dtb-amazonUpgrade dtb-mediatekUpgrade reiserfs-kmp-defaultUpgrade cluster-md-kmp-64kbUpgrade dlm-kmp-64kbUpgrade kernel-kvmsmall-develUpgrade kernel-azureUpgrade kernel-rt_debug-livepatch-develUpgrade dtb-freescaleUpgrade kernel-source-azureUpgrade dtb-allwinnerUpgrade reiserfs-kmp-64kbUpgrade kernel-rt-develUpgrade kernel-develUpgrade kernel-source-rtUpgrade kernel-default-vdsoUpgrade kernel-rt-extraUpgrade kernel-default-optionalUpgrade dtb-qcomUpgrade cluster-md-kmp-azureUpgrade kernel-debug-vdsoUpgrade kernel-rt_debug-develUpgrade dtb-exynosUpgrade kernel-devel-rtUpgrade kselftests-kmp-azureUpgrade ocfs2-kmp-azureUpgrade kernel-64kb-develUpgrade cluster-md-kmp-rtUpgrade dtb-amdUpgrade kernel-debug-develUpgrade kernel-azure-vdsoUpgrade cluster-md-kmp-defaultUpgrade dtb-amlogicUpgrade kernel-docs-htmlUpgrade dtb-socionextUpgrade dlm-kmp-defaultUpgrade dtb-nvidiaUpgrade dtb-apmUpgrade kernel-azure-develUpgrade dtb-renesasUpgrade kernel-default-baseUpgrade kernel-default-livepatch-develUpgrade kernel-kvmsmall-vdsoUpgrade kernel-rt_debugUpgrade kernel-rt-livepatch-develUpgrade kernel-azure-extraUpgrade kernel-macrosUpgrade kernel-zfcpdumpUpgrade kernel-rt-vdsoUpgrade kernel-defaultUpgrade dtb-rockchipUpgrade dlm-kmp-azureUpgrade kernel-symsUpgrade ocfs2-kmp-rtUpgrade gfs2-kmp-rtUpgrade gfs2-kmp-64kbUpgrade kselftests-kmp-rtUpgrade kernel-kvmsmallUpgrade kernel-default-extraUpgrade kernel-azure-livepatch-develUpgrade dtb-marvellUpgrade dtb-appleUpgrade dlm-kmp-rtUpgrade kernel-syms-rtUpgrade reiserfs-kmp-rtUpgrade kernel-docsUpgrade kernel-64kb-optionalUpgrade dtb-armUpgrade kselftests-kmp-defaultUpgrade kernel-rt_debug-vdsoUpgrade kernel-obs-qa | Dec 5, 2025 | Oct 10, 2024 |
| Ubuntu | — | Upgrade linux-image-generic-lpaeUpgrade linux-image-oem-22.04cUpgrade linux-image-gkeopUpgrade linux-image-lowlatency-64k-hwe-22.04Upgrade linux-image-nvidia-6.8Upgrade linux-image-6.8.0-1020-azureUpgrade linux-image-nvidia-64k-hwe-22.04Upgrade linux-image-nvidia-lowlatency-64kUpgrade linux-image-lowlatency-hwe-22.04Upgrade linux-image-nvidia-hwe-22.04Upgrade linux-image-6.8.0-1017-oracleUpgrade linux-image-azureUpgrade linux-image-6.8.0-1015-gkeUpgrade linux-image-oracleUpgrade linux-image-genericUpgrade linux-image-generic-64kUpgrade linux-image-nvidia-64k-6.8Upgrade linux-image-oem-24.04Upgrade linux-image-oem-22.04dUpgrade linux-image-6.8.0-1020-awsUpgrade linux-image-gkeUpgrade linux-image-6.8.0-1018-oemUpgrade linux-image-nvidiaUpgrade linux-image-oem-22.04Upgrade linux-image-nvidia-lowlatencyUpgrade linux-image-lowlatency-64kUpgrade linux-image-6.8.0-1019-nvidia-lowlatency-64kUpgrade linux-image-raspiUpgrade linux-image-6.8.0-50-generic-64kUpgrade linux-image-6.8.0-50-genericUpgrade linux-image-generic-64k-hwe-22.04Upgrade linux-image-6.8.0-1019-gcpUpgrade linux-image-gkeop-6.8Upgrade linux-image-generic-hwe-22.04Upgrade linux-image-6.8.0-50-lowlatencyUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-kvmUpgrade linux-image-nvidia-64kUpgrade linux-image-lowlatency-hwe-24.04Upgrade linux-image-6.8.0-1019-nvidia-64kUpgrade linux-image-6.8.0-1016-raspiUpgrade linux-image-oracle-64kUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-6.8.0-1020-azure-fdeUpgrade linux-image-awsUpgrade linux-image-6.8.0-1002-gkeopUpgrade linux-image-oem-24.04aUpgrade linux-image-6.8.0-1019-nvidia-lowlatencyUpgrade linux-image-ibmUpgrade linux-image-virtual-hwe-22.04Upgrade linux-image-virtualUpgrade linux-image-lowlatencyUpgrade linux-image-6.8.0-50-lowlatency-64kUpgrade linux-image-gcpUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-ibm-classicUpgrade linux-image-6.8.0-1017-oracle-64kUpgrade linux-image-azure-fdeUpgrade linux-image-oem-22.04aUpgrade linux-image-oem-22.04bUpgrade linux-image-ibm-lts-24.04Upgrade linux-image-lowlatency-64k-hwe-24.04Upgrade linux-image-6.8.0-1017-ibmUpgrade linux-image-6.8.0-1019-nvidia | Dec 13, 2024 | Sep 27, 2024 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 9, 2025 | Sep 27, 2024 |
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