CVE-2025-38146

net: openvswitch: Fix the dead loop of MPLS parse

State: Published
Severity: 9.4 Critical
Published: Jul 3, 2025
Updated: Oct 15, 2026
Reserved: Apr 16, 2025

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: <IRQ> 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 </IRQ>

Scores

CVSS	Score	Vector	Source
3.1	9.4 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 to before 4b9a086eedc1fddae632310386098c12155e3d0aAffected fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 to before ad17eb86d042d72a59fd184ad1adf34f5eb36843Affected fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 to before f26fe7c3002516dd3c288f1012786df31f4d89e0Affected fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 to before 8ebcd311b4866ab911d1445ead08690e67f0c488Affected fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 to before 69541e58323ec3e3904e1fa87a6213961b1f52f4Affected fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 to before 3c1906a3d50cb94fd0a10e97a1c0a40c0f033cb7Affected fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 to before 0bdc924bfb319fb10d1113cbf091fc26fb7b1f99Affected
LinuxLinux	5.5Affected before 5.5Not affected 5.10.239 through 5.10.Not affected 5.15.186 through 5.15.Not affected 6.1.142 through 6.1.Not affected 6.6.94 through 6.6.Not affected 6.12.34 through 6.12.Not affected 6.15.3 through 6.15.Not affected 6.16 and laterNot affected

Product

Versions

LinuxLinux

fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 to before 4b9a086eedc1fddae632310386098c12155e3d0aAffected
fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 to before ad17eb86d042d72a59fd184ad1adf34f5eb36843Affected
fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 to before f26fe7c3002516dd3c288f1012786df31f4d89e0Affected
fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 to before 8ebcd311b4866ab911d1445ead08690e67f0c488Affected
fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 to before 69541e58323ec3e3904e1fa87a6213961b1f52f4Affected
fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 to before 3c1906a3d50cb94fd0a10e97a1c0a40c0f033cb7Affected
fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 to before 0bdc924bfb319fb10d1113cbf091fc26fb7b1f99Affected

LinuxLinux

5.5Affected
before 5.5Not affected
5.10.239 through 5.10.*Not affected
5.15.186 through 5.15.*Not affected
6.1.142 through 6.1.*Not affected
6.6.94 through 6.6.*Not affected
6.12.34 through 6.12.*Not affected
6.15.3 through 6.15.*Not affected
6.16 and laterNot affected

References

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