{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72341", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.920Z", "datePublished": "2026-08-15T05:55:47.764Z", "dateUpdated": "2026-08-17T05:12:50.055Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:12:50.055Z" }, "descriptions": [ { "lang": "en", "value": "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." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/ethernet/mellanox/mlx5/core/en.h", "drivers/net/ethernet/mellanox/mlx5/core/en/hv_vhca_stats.c", "drivers/net/ethernet/mellanox/mlx5/core/en_main.c", "drivers/net/ethernet/mellanox/mlx5/core/en_stats.c", "drivers/net/ethernet/mellanox/mlx5/core/ipoib/ipoib.c" ], "versions": [ { "version": "fa691d0c9c0812b9045f3a9420862e47b3b92518", "lessThan": "5c7e3755abf663f033de24f917b77685e9543045", "status": "affected", "versionType": "git" }, { "version": "fa691d0c9c0812b9045f3a9420862e47b3b92518", "lessThan": "815515ec68f527ca755cb1e2c1ff9148f6b3ea56", "status": "affected", "versionType": "git" }, { "version": "fa691d0c9c0812b9045f3a9420862e47b3b92518", "lessThan": "5a799714e8ca0bce9ea40694f49914cf1adbbaa9", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/ethernet/mellanox/mlx5/core/en.h", "drivers/net/ethernet/mellanox/mlx5/core/en/hv_vhca_stats.c", "drivers/net/ethernet/mellanox/mlx5/core/en_main.c", "drivers/net/ethernet/mellanox/mlx5/core/en_stats.c", "drivers/net/ethernet/mellanox/mlx5/core/ipoib/ipoib.c" ], "versions": [ { "version": "5.17", "status": "affected" }, { "version": "0", "lessThan": "5.17", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.17", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/5c7e3755abf663f033de24f917b77685e9543045" }, { "url": "https://git.kernel.org/stable/c/815515ec68f527ca755cb1e2c1ff9148f6b3ea56" }, { "url": "https://git.kernel.org/stable/c/5a799714e8ca0bce9ea40694f49914cf1adbbaa9" } ], "title": "net/mlx5e: Fix publication race for priv->channel_stats[]", "x_generator": { "engine": "bippy-1.2.0" } } } }