Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 4b89251de024fb85329e4cbd8fbea551ae6c665c before 52c4beb79e095e0631b5cac46ed48a2aefe51985; affected 4b89251de024fb85329e4cbd8fbea551ae6c665c before 65feee671e37f3b6eda0b6af28f204b5bcf7fa50; affected 4b89251de024fb85329e4cbd8fbea551ae6c665c before 505ae01f75f839b54329164bbfecf24cc1361b31; affected 4b89251de024fb85329e4cbd8fbea551ae6c665c before b1d305abef4640af1b4f1b4774d513cd81b10cfc |
| Linux / Linux | affected 5.1; unaffected 0 before 5.1; unaffected 6.1.111 through 6.1.*; unaffected 6.6.52 through 6.6.*; unaffected 6.10.11 through 6.10.*; unaffected 6.11 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/52c4beb79e095e0631b5cac46ed48a2aefe51985
- https://git.kernel.org/stable/c/65feee671e37f3b6eda0b6af28f204b5bcf7fa50
- https://git.kernel.org/stable/c/505ae01f75f839b54329164bbfecf24cc1361b31
- https://git.kernel.org/stable/c/b1d305abef4640af1b4f1b4774d513cd81b10cfc
ADP enrichment
No English description supplied.
No references supplied.
No English description supplied.