Bug 2426241 (CVE-2023-54216)

Summary: CVE-2023-54216 kernel: net/mlx5e: TC, Fix using eswitch mapping in nic mode
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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Doc Text:
A flaw was found in the Linux kernel net/mlx5e Ethernet driver’s traffic control handling code. Under certain configurations when operating in NIC mode, the driver erroneously uses the eswitch object mapping pool, which is not initialized in that mode. This can lead to an invalid mapping reference and related kernel trace conditions, potentially causing network driver instability or denial of service. An unprivileged local user with access to configure traffic control on an affected system may be able to trigger this condition
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2025-12-30 13:18:47 UTC
In the Linux kernel, the following vulnerability has been resolved:

net/mlx5e: TC, Fix using eswitch mapping in nic mode

Cited patch is using the eswitch object mapping pool while
in nic mode where it isn't initialized. This results in the
trace below [0].

Fix that by using either nic or eswitch object mapping pool
depending if eswitch is enabled or not.

[0]:
[  826.446057] ==================================================================
[  826.446729] BUG: KASAN: slab-use-after-free in mlx5_add_flow_rules+0x30/0x490 [mlx5_core]
[  826.447515] Read of size 8 at addr ffff888194485830 by task tc/6233

[  826.448243] CPU: 16 PID: 6233 Comm: tc Tainted: G        W          6.3.0-rc6+ #1
[  826.448890] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
[  826.449785] Call Trace:
[  826.450052]  <TASK>
[  826.450302]  dump_stack_lvl+0x33/0x50
[  826.450650]  print_report+0xc2/0x610
[  826.450998]  ? __virt_addr_valid+0xb1/0x130
[  826.451385]  ? mlx5_add_flow_rules+0x30/0x490 [mlx5_core]
[  826.451935]  kasan_report+0xae/0xe0
[  826.452276]  ? mlx5_add_flow_rules+0x30/0x490 [mlx5_core]
[  826.452829]  mlx5_add_flow_rules+0x30/0x490 [mlx5_core]
[  826.453368]  ? __kmalloc_node+0x5a/0x120
[  826.453733]  esw_add_restore_rule+0x20f/0x270 [mlx5_core]
[  826.454288]  ? mlx5_eswitch_add_send_to_vport_meta_rule+0x260/0x260 [mlx5_core]
[  826.455011]  ? mutex_unlock+0x80/0xd0
[  826.455361]  ? __mutex_unlock_slowpath.constprop.0+0x210/0x210
[  826.455862]  ? mapping_add+0x2cb/0x440 [mlx5_core]
[  826.456425]  mlx5e_tc_action_miss_mapping_get+0x139/0x180 [mlx5_core]
[  826.457058]  ? mlx5e_tc_update_skb_nic+0xb0/0xb0 [mlx5_core]
[  826.457636]  ? __kasan_kmalloc+0x77/0x90
[  826.458000]  ? __kmalloc+0x57/0x120
[  826.458336]  mlx5_tc_ct_flow_offload+0x325/0xe40 [mlx5_core]
[  826.458916]  ? ct_kernel_enter.constprop.0+0x48/0xa0
[  826.459360]  ? mlx5_tc_ct_parse_action+0xf0/0xf0 [mlx5_core]
[  826.459933]  ? mlx5e_mod_hdr_attach+0x491/0x520 [mlx5_core]
[  826.460507]  ? mlx5e_mod_hdr_get+0x12/0x20 [mlx5_core]
[  826.461046]  ? mlx5e_tc_attach_mod_hdr+0x154/0x170 [mlx5_core]
[  826.461635]  mlx5e_configure_flower+0x969/0x2110 [mlx5_core]
[  826.462217]  ? _raw_spin_lock_bh+0x85/0xe0
[  826.462597]  ? __mlx5e_add_fdb_flow+0x750/0x750 [mlx5_core]
[  826.463163]  ? kasan_save_stack+0x2e/0x40
[  826.463534]  ? down_read+0x115/0x1b0
[  826.463878]  ? down_write_killable+0x110/0x110
[  826.464288]  ? tc_setup_action.part.0+0x9f/0x3b0
[  826.464701]  ? mlx5e_is_uplink_rep+0x4c/0x90 [mlx5_core]
[  826.465253]  ? mlx5e_tc_reoffload_flows_work+0x130/0x130 [mlx5_core]
[  826.465878]  tc_setup_cb_add+0x112/0x250
[  826.466247]  fl_hw_replace_filter+0x230/0x310 [cls_flower]
[  826.466724]  ? fl_hw_destroy_filter+0x1a0/0x1a0 [cls_flower]
[  826.467212]  fl_change+0x14e1/0x2030 [cls_flower]
[  826.467636]  ? sock_def_readable+0x89/0x120
[  826.468019]  ? fl_tmplt_create+0x2d0/0x2d0 [cls_flower]
[  826.468509]  ? kasan_unpoison+0x23/0x50
[  826.468873]  ? get_random_u16+0x180/0x180
[  826.469244]  ? __radix_tree_lookup+0x2b/0x130
[  826.469640]  ? fl_get+0x7b/0x140 [cls_flower]
[  826.470042]  ? fl_mask_put+0x200/0x200 [cls_flower]
[  826.470478]  ? __mutex_unlock_slowpath.constprop.0+0x210/0x210
[  826.470973]  ? fl_tmplt_create+0x2d0/0x2d0 [cls_flower]
[  826.471427]  tc_new_tfilter+0x644/0x1050
[  826.471795]  ? tc_get_tfilter+0x860/0x860
[  826.472170]  ? __thaw_task+0x130/0x130
[  826.472525]  ? arch_stack_walk+0x98/0xf0
[  826.472892]  ? cap_capable+0x9f/0xd0
[  826.473235]  ? security_capable+0x47/0x60
[  826.473608]  rtnetlink_rcv_msg+0x1d5/0x550
[  826.473985]  ? rtnl_calcit.isra.0+0x1f0/0x1f0
[  826.474383]  ? __stack_depot_save+0x35/0x4c0
[  826.474779]  ? kasan_save_stack+0x2e/0x40
[  826.475149]  ? kasan_save_stack+0x1e/0x40
[  826.475518]  ? __kasan_record_aux_stack+0x9f/0xb0
[  826.475939]  ? task_work_add+0x77/0x1c0
[  826.476305]  netlink_rcv_skb+0xe0/0x210
---truncated---