CVE-2026-68139
In the Linux kernel, the following vulnerability has been resolved:
net/mlx5e: Use sender devcom for MPV master-up
After PCIe DPC recovery, mlx5 reloads the affected functions and replays multiport affiliation events. In the reported failure, the first relevant device error was:
mlx5 recovered the PCI functions and resumed 0000:11:00.1. During that resume, RDMA multiport binding replayed MLX5_DRIVER_EVENT_AFFILIATION_DONE and mlx5e sent MPV_DEVCOM_MASTER_UP. The host then panicked with:
MPV devcom registration publishes mlx5e private data to the component peer list before mlx5e_devcom_init_mpv() stores the returned component device in priv->devcom.
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A concurrent master-up event can therefore reach a peer whose private data is visible but whose priv->devcom backpointer is still NULL.
MPV_DEVCOM_MASTER_UP already carries the sender/master mlx5e private data as event_data. The ready bit is stored on the shared devcom component, not on an individual peer. Use the sender devcom when marking the MPV component ready.
This preserves the readiness transition while avoiding a NULL dereference of the peer devcom pointer during affiliation replay after PCI error recovery.
Detalles técnicos trazas, registros y código del informe original
pcieport 0000:10:01.1: DPC: containment event pcieport 0000:10:01.1: PCIe Bus Error: severity=Uncorrected (Fatal) pcieport 0000:10:01.1: [ 5] SDES (First) BUG: kernel NULL pointer dereference, address: 0000000000000010 RIP: mlx5_devcom_comp_set_ready+0x5/0x40 [mlx5_core] RDI: 0000000000000000 Call trace included: mlx5_devcom_comp_set_ready mlx5e_devcom_event_mpv mlx5_devcom_send_event mlx5_ib_bind_slave_port mlx5r_mp_probe mlx5_pci_resume
CVSS
NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.18%
- Percentil entre todas las CVEs puntuadas: 6
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
JSON original (NVD)
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{
"id": "CVE-2026-68139",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "bf11485f8419f90ffaa3804fd01d8468fcc56e23",
"lessThan": "c698b2735613f1f35c55688bd2252f75f31c49ad",
"versionType": "git"
},
{
"status": "affected",
"version": "bf11485f8419f90ffaa3804fd01d8468fcc56e23",
"lessThan": "40f9a124ebbe0d60fe165fb3f87515c35b2d72f5",
"versionType": "git"
},
{
"status": "affected",
"version": "bf11485f8419f90ffaa3804fd01d8468fcc56e23",
"lessThan": "a60c81f168c9fe4f5d84302d1e32b717f5a8a933",
"versionType": "git"
},
{
"status": "affected",
"version": "bf11485f8419f90ffaa3804fd01d8468fcc56e23",
"lessThan": "e32649b4bad90a6216d8e93cd7dd050af8ac9740",
"versionType": "git"
}
],
"programFiles": [
"drivers/net/ethernet/mellanox/mlx5/core/en_main.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.7"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.7",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.101",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.42",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.6",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/net/ethernet/mellanox/mlx5/core/en_main.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-08-10T13:19:59.523",
"references": [
{
"url": "https://git.kernel.org/stable/c/40f9a124ebbe0d60fe165fb3f87515c35b2d72f5",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/a60c81f168c9fe4f5d84302d1e32b717f5a8a933",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/c698b2735613f1f35c55688bd2252f75f31c49ad",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/e32649b4bad90a6216d8e93cd7dd050af8ac9740",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: Use sender devcom for MPV master-up\n\nAfter PCIe DPC recovery, mlx5 reloads the affected functions and\nreplays multiport affiliation events. In the reported failure, the\nfirst relevant device error was:\n\n pcieport 0000:10:01.1: DPC: containment event\n pcieport 0000:10:01.1: PCIe Bus Error: severity=Uncorrected (Fatal)\n pcieport 0000:10:01.1: [ 5] SDES (First)\n\nmlx5 recovered the PCI functions and resumed 0000:11:00.1. During\nthat resume, RDMA multiport binding replayed\nMLX5_DRIVER_EVENT_AFFILIATION_DONE and mlx5e sent\nMPV_DEVCOM_MASTER_UP. The host then panicked with:\n\n BUG: kernel NULL pointer dereference, address: 0000000000000010\n RIP: mlx5_devcom_comp_set_ready+0x5/0x40 [mlx5_core]\n RDI: 0000000000000000\n\nCall trace included:\n\n mlx5_devcom_comp_set_ready\n mlx5e_devcom_event_mpv\n mlx5_devcom_send_event\n mlx5_ib_bind_slave_port\n mlx5r_mp_probe\n mlx5_pci_resume\n\nMPV devcom registration publishes mlx5e private data to the component\npeer list before mlx5e_devcom_init_mpv() stores the returned component\ndevice in priv->devcom. A concurrent master-up event can therefore\nreach a peer whose private data is visible but whose priv->devcom\nbackpointer is still NULL.\n\nMPV_DEVCOM_MASTER_UP already carries the sender/master mlx5e private\ndata as event_data. The ready bit is stored on the shared devcom\ncomponent, not on an individual peer. Use the sender devcom when\nmarking the MPV component ready.\n\nThis preserves the readiness transition while avoiding a NULL\ndereference of the peer devcom pointer during affiliation replay after\nPCI error recovery."
}
],
"lastModified": "2026-08-17T05:18:13.847",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}