Critical 9.4Published Jul 3, 2025

CVE-2025-38146net: openvswitch: Fix the dead loop of MPLS parse

Updated under an hour ago (2026-10-19 06:30 UTC)

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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>

CVSS: 9.4 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 15, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 before 4b9a086eedc1fddae632310386098c12155e3d0a; from fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 before ad17eb86d042d72a59fd184ad1adf34f5eb36843; from fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 before f26fe7c3002516dd3c288f1012786df31f4d89e0; from fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 before 8ebcd311b4866ab911d1445ead08690e67f0c488; from fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 before 69541e58323ec3e3904e1fa87a6213961b1f52f4; from fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 before 3c1906a3d50cb94fd0a10e97a1c0a40c0f033cb7; from fbdcdd78da7c95f1b970d371e1b23cbd3aa990f3 before 0bdc924bfb319fb10d1113cbf091fc26fb7b1f99	CNA record
linux linux_kernel linux:linux_kernel	from 5.5 before 5.10.239; from 5.11 before 5.15.186; from 5.16 before 6.1.142; from 6.2 before 6.6.94; from 6.7 before 6.12.34; from 6.13 before 6.15.3	NVD
debian debian_linux debian:debian_linux	11.0	NVD

References

https://git.kernel.org/stable/c/4b9a086eedc1fddae632310386098c12155e3d0apatch
https://git.kernel.org/stable/c/ad17eb86d042d72a59fd184ad1adf34f5eb36843patch
https://git.kernel.org/stable/c/f26fe7c3002516dd3c288f1012786df31f4d89e0patch
https://git.kernel.org/stable/c/8ebcd311b4866ab911d1445ead08690e67f0c488patch
https://git.kernel.org/stable/c/69541e58323ec3e3904e1fa87a6213961b1f52f4patch
https://git.kernel.org/stable/c/3c1906a3d50cb94fd0a10e97a1c0a40c0f033cb7patch
https://git.kernel.org/stable/c/0bdc924bfb319fb10d1113cbf091fc26fb7b1f99patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.htmlthird-party-advisory
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlthird-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.