{"cve":"CVE-2026-72341","nvd":{"published":"2026-08-15T06:22:07.403","modified":"2026-10-21T13:19:35.423","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: Fix publication race for priv->channel_stats[]\n\nmlx5e_channel_stats_alloc() publishes a new entry to\npriv->channel_stats[] and then increments priv->stats_nch as a\npublication token, but neither store carries any memory barrier:\n\n\tpriv->channel_stats[ix] = kvzalloc_node(...);\n\tif (!priv->channel_stats[ix])\n\t\treturn -ENOMEM;\n\tpriv->stats_nch++;\n\nConcurrent readers compute the loop bound from priv->stats_nch and\nthen dereference priv->channel_stats[i] using plain accesses, e.g.\n\n\tfor (i = 0; i < priv->stats_nch; i++) {\n\t\tstruct mlx5e_channel_stats *cs = priv->channel_stats[i];\n\t\t... cs->rq.packets ...\n\t}\n\nOn weakly-ordered architectures (ARM, PowerPC, RISC-V) the writes to\nchannel_stats[ix] and stats_nch may become visible to other CPUs out\nof program order. A reader can observe stats_nch == N while still\nseeing channel_stats[N-1] == NULL, leading to a NULL pointer\ndereference in the channel_stats loop.\n\nThis has been observed in production on BlueField-3 DPUs (arm64),\nwhere ovs-vswitchd queries netdev statistics over netlink during NIC\nbringup, racing mlx5e_open_channel() -> mlx5e_channel_stats_alloc()\non another CPU:\n\n  Unable to handle kernel NULL pointer dereference at virtual address 0x840\n  Hardware name: BlueField-3 DPU\n  pc : mlx5e_fold_sw_stats64+0x30/0x180 [mlx5_core]\n  Call trace:\n   mlx5e_fold_sw_stats64+0x30/0x180 [mlx5_core]\n   dev_get_stats+0x50/0xc0\n   ovs_vport_get_stats+0x38/0xac [openvswitch]\n   ovs_vport_cmd_fill_info+0x194/0x290 [openvswitch]\n   ovs_vport_cmd_get+0xbc/0x10c [openvswitch]\n   genl_family_rcv_msg_doit+0xd0/0x160\n   genl_rcv_msg+0xec/0x1f0\n   netlink_rcv_skb+0x64/0x130\n   genl_rcv+0x40/0x60\n   netlink_unicast+0x2fc/0x370\n   netlink_sendmsg+0x1dc/0x454\n   ...\n   __arm64_sys_sendmsg+0x2c/0x40\n\nAdd mlx5e_stats_nch_write() and mlx5e_stats_nch_read() helpers in en.h\nthat wrap the smp_store_release()/smp_load_acquire() pair on stats_nch.\nThe release/acquire pair establishes the contract:\n\n  stats_nch == N  =>  channel_stats[0..N-1] are visible and non-NULL.\n\nPublish the stats_nch increment via mlx5e_stats_nch_write() in the\nwriter (mlx5e_channel_stats_alloc()), and read stats_nch via\nmlx5e_stats_nch_read() in all readers: mlx5e RX/TX queue stats,\nmlx5e_get_base_stats(), ethtool channels stats, IPoIB stats, the\nsw_stats fold and the HV VHCA stats agent.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/268869794170af37727816ad02051808adb9c9c3","https://git.kernel.org/stable/c/5a799714e8ca0bce9ea40694f49914cf1adbbaa9","https://git.kernel.org/stable/c/5c7e3755abf663f033de24f917b77685e9543045","https://git.kernel.org/stable/c/815515ec68f527ca755cb1e2c1ff9148f6b3ea56","https://git.kernel.org/stable/c/acd34d24342a28794e706ce8191ca6c3114a38ae"],"products":[],"source":"nvd","synced_at":"2026-10-22T16:41:11.231219466+00:00"},"epss":{"cve":"CVE-2026-72341","score":0.00209,"percentile":0.10928,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}