CVE-2026-72341 (GCVE-0-2026-72341)
Vulnerability from cvelistv5
Published
2026-08-15 05:55
Modified
2026-08-17 05:12
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
net/mlx5e: Fix publication race for priv->channel_stats[]
mlx5e_channel_stats_alloc() publishes a new entry to
priv->channel_stats[] and then increments priv->stats_nch as a
publication token, but neither store carries any memory barrier:
priv->channel_stats[ix] = kvzalloc_node(...);
if (!priv->channel_stats[ix])
return -ENOMEM;
priv->stats_nch++;
Concurrent readers compute the loop bound from priv->stats_nch and
then dereference priv->channel_stats[i] using plain accesses, e.g.
for (i = 0; i < priv->stats_nch; i++) {
struct mlx5e_channel_stats *cs = priv->channel_stats[i];
... cs->rq.packets ...
}
On weakly-ordered architectures (ARM, PowerPC, RISC-V) the writes to
channel_stats[ix] and stats_nch may become visible to other CPUs out
of program order. A reader can observe stats_nch == N while still
seeing channel_stats[N-1] == NULL, leading to a NULL pointer
dereference in the channel_stats loop.
This has been observed in production on BlueField-3 DPUs (arm64),
where ovs-vswitchd queries netdev statistics over netlink during NIC
bringup, racing mlx5e_open_channel() -> mlx5e_channel_stats_alloc()
on another CPU:
Unable to handle kernel NULL pointer dereference at virtual address 0x840
Hardware name: BlueField-3 DPU
pc : mlx5e_fold_sw_stats64+0x30/0x180 [mlx5_core]
Call trace:
mlx5e_fold_sw_stats64+0x30/0x180 [mlx5_core]
dev_get_stats+0x50/0xc0
ovs_vport_get_stats+0x38/0xac [openvswitch]
ovs_vport_cmd_fill_info+0x194/0x290 [openvswitch]
ovs_vport_cmd_get+0xbc/0x10c [openvswitch]
genl_family_rcv_msg_doit+0xd0/0x160
genl_rcv_msg+0xec/0x1f0
netlink_rcv_skb+0x64/0x130
genl_rcv+0x40/0x60
netlink_unicast+0x2fc/0x370
netlink_sendmsg+0x1dc/0x454
...
__arm64_sys_sendmsg+0x2c/0x40
Add mlx5e_stats_nch_write() and mlx5e_stats_nch_read() helpers in en.h
that wrap the smp_store_release()/smp_load_acquire() pair on stats_nch.
The release/acquire pair establishes the contract:
stats_nch == N => channel_stats[0..N-1] are visible and non-NULL.
Publish the stats_nch increment via mlx5e_stats_nch_write() in the
writer (mlx5e_channel_stats_alloc()), and read stats_nch via
mlx5e_stats_nch_read() in all readers: mlx5e RX/TX queue stats,
mlx5e_get_base_stats(), ethtool channels stats, IPoIB stats, the
sw_stats fold and the HV VHCA stats agent.
References
Impacted products
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"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"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "5c7e3755abf663f033de24f917b77685e9543045",
"status": "affected",
"version": "fa691d0c9c0812b9045f3a9420862e47b3b92518",
"versionType": "git"
},
{
"lessThan": "815515ec68f527ca755cb1e2c1ff9148f6b3ea56",
"status": "affected",
"version": "fa691d0c9c0812b9045f3a9420862e47b3b92518",
"versionType": "git"
},
{
"lessThan": "5a799714e8ca0bce9ea40694f49914cf1adbbaa9",
"status": "affected",
"version": "fa691d0c9c0812b9045f3a9420862e47b3b92518",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"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"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.17"
},
{
"lessThan": "5.17",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.40",
"versionStartIncluding": "5.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.5",
"versionStartIncluding": "5.17",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "5.17",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: Fix publication race for priv-\u003echannel_stats[]\n\nmlx5e_channel_stats_alloc() publishes a new entry to\npriv-\u003echannel_stats[] and then increments priv-\u003estats_nch as a\npublication token, but neither store carries any memory barrier:\n\n\tpriv-\u003echannel_stats[ix] = kvzalloc_node(...);\n\tif (!priv-\u003echannel_stats[ix])\n\t\treturn -ENOMEM;\n\tpriv-\u003estats_nch++;\n\nConcurrent readers compute the loop bound from priv-\u003estats_nch and\nthen dereference priv-\u003echannel_stats[i] using plain accesses, e.g.\n\n\tfor (i = 0; i \u003c priv-\u003estats_nch; i++) {\n\t\tstruct mlx5e_channel_stats *cs = priv-\u003echannel_stats[i];\n\t\t... cs-\u003erq.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() -\u003e 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 =\u003e 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."
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T05:12:50.055Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"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-\u003echannel_stats[]",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-72341",
"datePublished": "2026-08-15T05:55:47.764Z",
"dateReserved": "2026-08-09T03:40:39.920Z",
"dateUpdated": "2026-08-17T05:12:50.055Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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