CVE-2025-38146 Information

Jul 04, 2025 cve

Description

In the Linux kernel the following vulnerability has been resolved:

net: openvswitch: Fix the dead loop of MPLS parse

The unexpected MPLS packet may not end with the bottom label stack. When there are many stacks The label count value has wrapped around. A dead loop occurs soft lockup/CPU stuck finally.

stack backtrace: UBSAN: array-index-out-of-bounds in /build/linux-0Pa0xK/linux-5.15.0/net/openvswitch/flow.c:662:26 index -1 is out of range for type ‘__be32 [3]’ CPU: 34 PID: 0 Comm: swapper/34 Kdump: loaded Tainted: G OE 5.15.0-121-generic 131-Ubuntu Hardware name: Dell Inc. PowerEdge C6420/0JP9TF BIOS 2.12.2 07/14/2021 Call Trace: show_stack+0x52/0x5c dump_stack_lvl+0x4a/0x63 dump_stack+0x10/0x16 ubsan_epilogue+0x9/0x36 __ubsan_handle_out_of_bounds.cold+0x44/0x49 key_extract_l3l4+0x82a/0x840 [openvswitch] ? kfree_skbmem+0x52/0xa0 key_extract+0x9c/0x2b0 [openvswitch] ovs_flow_key_extract+0x124/0x350 [openvswitch] ovs_vport_receive+0x61/0xd0 [openvswitch] ? kernel_init_free_pages.part.0+0x4a/0x70 ? get_page_from_freelist+0x353/0x540 netdev_port_receive+0xc4/0x180 [openvswitch] ? netdev_port_receive+0x180/0x180 [openvswitch] netdev_frame_hook+0x1f/0x40 [openvswitch] __netif_receive_skb_core.constprop.0+0x23a/0xf00 __netif_receive_skb_list_core+0xfa/0x240 netif_receive_skb_list_internal+0x18e/0x2a0 napi_complete_done+0x7a/0x1c0 bnxt_poll+0x155/0x1c0 [bnxt_en] __napi_poll+0x30/0x180 net_rx_action+0x126/0x280 ? bnxt_msix+0x67/0x80 [bnxt_en] handle_softirqs+0xda/0x2d0 irq_exit_rcu+0x96/0xc0 common_interrupt+0x8e/0xa0

Reference

https://git.kernel.org/stable/c/0bdc924bfb319fb10d1113cbf091fc26fb7b1f99 https://git.kernel.org/stable/c/3c1906a3d50cb94fd0a10e97a1c0a40c0f033cb7 https://git.kernel.org/stable/c/4b9a086eedc1fddae632310386098c12155e3d0a https://git.kernel.org/stable/c/69541e58323ec3e3904e1fa87a6213961b1f52f4 https://git.kernel.org/stable/c/8ebcd311b4866ab911d1445ead08690e67f0c488 https://git.kernel.org/stable/c/ad17eb86d042d72a59fd184ad1adf34f5eb36843 https://git.kernel.org/stable/c/f26fe7c3002516dd3c288f1012786df31f4d89e0

CNNVD-202507-233 (Published: 2025-07-03)

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