{"id":"CVE-2026-72341","state":"PUBLISHED","title":"net/mlx5e: Fix publication race for priv->channel_stats[]","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.","publishedAt":"2026-08-15T05:55:47.764Z","updatedAt":"2026-10-30T12:29:09.273Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"fa691d0c9c0812b9045f3a9420862e47b3b92518","status":"affected","lessThan":"df122c593735aa5e1c97457767aa10ed8fa972e0","versionType":"git"},{"version":"fa691d0c9c0812b9045f3a9420862e47b3b92518","status":"affected","lessThan":"268869794170af37727816ad02051808adb9c9c3","versionType":"git"},{"version":"fa691d0c9c0812b9045f3a9420862e47b3b92518","status":"affected","lessThan":"acd34d24342a28794e706ce8191ca6c3114a38ae","versionType":"git"},{"version":"fa691d0c9c0812b9045f3a9420862e47b3b92518","status":"affected","lessThan":"5c7e3755abf663f033de24f917b77685e9543045","versionType":"git"},{"version":"fa691d0c9c0812b9045f3a9420862e47b3b92518","status":"affected","lessThan":"815515ec68f527ca755cb1e2c1ff9148f6b3ea56","versionType":"git"},{"version":"fa691d0c9c0812b9045f3a9420862e47b3b92518","status":"affected","lessThan":"5a799714e8ca0bce9ea40694f49914cf1adbbaa9","versionType":"git"}],"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"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.17","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"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"]}],"references":["https://git.kernel.org/stable/c/df122c593735aa5e1c97457767aa10ed8fa972e0","https://git.kernel.org/stable/c/268869794170af37727816ad02051808adb9c9c3","https://git.kernel.org/stable/c/acd34d24342a28794e706ce8191ca6c3114a38ae","https://git.kernel.org/stable/c/5c7e3755abf663f033de24f917b77685e9543045","https://git.kernel.org/stable/c/815515ec68f527ca755cb1e2c1ff9148f6b3ea56","https://git.kernel.org/stable/c/5a799714e8ca0bce9ea40694f49914cf1adbbaa9"],"weaknesses":[],"ingestedAt":"2026-10-30T12:48:04.825Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/72xxx/CVE-2026-72341.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72341","state":"PUBLISHED","datePublished":"2026-08-15T05:55:47.764Z","dateUpdated":"2026-10-30T12:29:09.273Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-09T03:40:39.920Z"},"containers":{"cna":{"title":"net/mlx5e: Fix publication race for priv->channel_stats[]","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":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"fa691d0c9c0812b9045f3a9420862e47b3b92518","status":"affected","lessThan":"df122c593735aa5e1c97457767aa10ed8fa972e0","versionType":"git"},{"version":"fa691d0c9c0812b9045f3a9420862e47b3b92518","status":"affected","lessThan":"268869794170af37727816ad02051808adb9c9c3","versionType":"git"},{"version":"fa691d0c9c0812b9045f3a9420862e47b3b92518","status":"affected","lessThan":"acd34d24342a28794e706ce8191ca6c3114a38ae","versionType":"git"},{"version":"fa691d0c9c0812b9045f3a9420862e47b3b92518","status":"affected","lessThan":"5c7e3755abf663f033de24f917b77685e9543045","versionType":"git"},{"version":"fa691d0c9c0812b9045f3a9420862e47b3b92518","status":"affected","lessThan":"815515ec68f527ca755cb1e2c1ff9148f6b3ea56","versionType":"git"},{"version":"fa691d0c9c0812b9045f3a9420862e47b3b92518","status":"affected","lessThan":"5a799714e8ca0bce9ea40694f49914cf1adbbaa9","versionType":"git"}],"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"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.17","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.114","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"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"]}],"references":[{"url":"https://git.kernel.org/stable/c/df122c593735aa5e1c97457767aa10ed8fa972e0"},{"url":"https://git.kernel.org/stable/c/268869794170af37727816ad02051808adb9c9c3"},{"url":"https://git.kernel.org/stable/c/acd34d24342a28794e706ce8191ca6c3114a38ae"},{"url":"https://git.kernel.org/stable/c/5c7e3755abf663f033de24f917b77685e9543045"},{"url":"https://git.kernel.org/stable/c/815515ec68f527ca755cb1e2c1ff9148f6b3ea56"},{"url":"https://git.kernel.org/stable/c/5a799714e8ca0bce9ea40694f49914cf1adbbaa9"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:29:09.273Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.17","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.17","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.17","versionEndExcluding":"6.12.114"},{"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"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}