Is CVE-2026-43466 actively exploited?

No active exploitation of CVE-2026-43466 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-43466 be exploited remotely?

Yes. CVE-2026-43466 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-43466?

CVE-2026-43466 has a CVSS score of 8.2 (HIGH).

HOME VULNERABILITIESCVE-2026-43466

HIGH

CVE-2026-43466

Published: May 8, 2026· Updated: May 12, 2026

8.2

CVSS v3.1

EPSS:0.05%probability of exploitation in 30 daysPercentile:16.1th

Official Description

In the Linux kernel, the following vulnerability has been resolved:

net/mlx5e: Fix DMA FIFO desync on error CQE SQ recovery

In case of a TX error CQE, a recovery flow is triggered,

mlx5e_reset_txqsq_cc_pc() resets dma_fifo_cc to 0 but not dma_fifo_pc,

desyncing the DMA FIFO producer and consumer.

After recovery, the producer pushes new DMA entries at the old

dma_fifo_pc, while the consumer reads from position 0.

This causes us to unmap stale DMA addresses from before the recovery.

The DMA FIFO is a purely software construct with no HW counterpart.

At the point of reset, all WQEs have been flushed so dma_fifo_cc is

already equal to dma_fifo_pc. There is no need to reset either counter,

similar to how skb_fifo pc/cc are untouched.

Remove the 'dma_fifo_cc = 0' reset.

This fixes the following WARNING:

WARNING: CPU: 0 PID: 0 at drivers/iommu/dma-iommu.c:1240 iommu_dma_unmap_page+0x79/0x90

Modules linked in: mlx5_vdpa vringh vdpa bonding mlx5_ib mlx5_vfio_pci ipip mlx5_fwctl tunnel4 mlx5_core ib_ipoib geneve ip6_gre ip_gre gre nf_tables ip6_tunnel rdma_ucm ib_uverbs ib_umad vfio_pci vfio_pci_core act_mirred act_skbedit act_vlan vhost_net vhost tap ip6table_mangle ip6table_nat ip6table_filter ip6_tables iptable_mangle cls_matchall nfnetlink_cttimeout act_gact cls_flower sch_ingress vhost_iotlb iptable_raw tunnel6 vfio_iommu_type1 vfio openvswitch nsh rpcsec_gss_krb5 auth_rpcgss oid_registry xt_conntrack xt_MASQUERADE nf_conntrack_netlink nfnetlink iptable_nat nf_nat xt_addrtype br_netfilter overlay zram zsmalloc rpcrdma ib_iser libiscsi scsi_transport_iscsi rdma_cm iw_cm ib_cm ib_core fuse [last unloaded: nf_tables]

CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.13.0-rc5_for_upstream_min_debug_2024_12_30_21_33 #1

Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014

RIP: 0010:iommu_dma_unmap_page+0x79/0x90

Code: 2b 4d 3b 21 72 26 4d 3b 61 08 73 20 49 89 d8 44 89 f9 5b 4c 89 f2 4c 89 e6 48 89 ef 5d 41 5c 41 5d 41 5e 41 5f e9 c7 ae 9e ff <0f> 0b 5b 5d 41 5c 41 5d 41 5e 41 5f c3 66 2e 0f 1f 84 00 00 00 00

Call Trace:

<IRQ>

? __warn+0x7d/0x110

? iommu_dma_unmap_page+0x79/0x90

? report_bug+0x16d/0x180

? handle_bug+0x4f/0x90

? exc_invalid_op+0x14/0x70

? asm_exc_invalid_op+0x16/0x20

? iommu_dma_unmap_page+0x79/0x90

? iommu_dma_unmap_page+0x2e/0x90

dma_unmap_page_attrs+0x10d/0x1b0

mlx5e_tx_wi_dma_unmap+0xbe/0x120 [mlx5_core]

mlx5e_poll_tx_cq+0x16d/0x690 [mlx5_core]

mlx5e_napi_poll+0x8b/0xac0 [mlx5_core]

__napi_poll+0x24/0x190

net_rx_action+0x32a/0x3b0

? mlx5_eq_comp_int+0x7e/0x270 [mlx5_core]

? notifier_call_chain+0x35/0xa0

handle_softirqs+0xc9/0x270

irq_exit_rcu+0x71/0xd0

common_interrupt+0x7f/0xa0

</IRQ>

<TASK>

asm_common_interrupt+0x22/0x40

NVD Source

Technical Analysis

CVE-2026-43466 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 8.2.