CVE-2026-81005
In the Linux kernel, the following vulnerability has been resolved:
ipmi: si: Fix NULL pointer dereference after failed registration
try_smi_init() allocates new_smi->si_sm and later calls ipmi_register_smi_mod(), which maps to ipmi_add_smi().
During ipmi_add_smi(), the upper IPMI message handler obtains the initial BMC device information through __bmc_get_device_id(). This can fail if the BMC does not return a successful response to the Get Device ID command.
When the BMC returns a nonzero completion code, the device-id helper retries the command and eventually returns -EIO if the device ID still cannot be fetched.
Leer descripción completaMostrar menos
On this failure path, ipmi_add_smi() logs "Unable to get the device id" and goes to out_err_started, where it invokes the lower driver's shutdown callback. try_smi_init() then logs the returned registration failure:
ipmi_si IPI0001:00: IPMI message handler: Unable to get the device id: -5 ipmi_si IPI0001:00: Unable to register device: error -5
For ipmi_si, the shutdown callback is shutdown_smi(), which cleans up the SI state machine data, frees smi_info->si_sm, and sets smi_info->si_sm and smi_info->intf to NULL.
However, intf->in_shutdown is not set on this failed-registration rollback path. Therefore, the asynchronous redo_bmc_reg work item can still retry BMC device-id probing after the lower driver has already cleared its SI state machine data. In the observed case, that retry path reached start_next_msg(), which passed the NULL smi_info->si_sm pointer to the selected KCS state machine handler:
Set intf->in_shutdown on the out_err_started path before invoking the lower driver's shutdown callback. This prevents later redo_bmc_reg retries from using an interface whose lower driver state has been cleaned up, and applies the same shutdown state to other IPMI interfaces as well.
Detalles técnicos trazas, registros y código del informe original
BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 Workqueue: events redo_bmc_reg [ipmi_msghandler] RIP: start_kcs_transaction+0x2c/0x190 [ipmi_si] Call Trace: start_next_msg+0x50/0x80 [ipmi_si] check_start_timer_thread.part.9+0x3b/0x50 [ipmi_si] sender+0x69/0x80 [ipmi_si] i_ipmi_request+0x2ac/0x9d0 [ipmi_msghandler] __get_device_id.isra.29+0xaa/0x180 [ipmi_msghandler] __bmc_get_device_id+0xef/0x950 [ipmi_msghandler] redo_bmc_reg+0x52/0x60 [ipmi_msghandler] process_one_work+0x1a7/0x360
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: 7
- 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
- https://git.kernel.org/stable/c/53af3a8bae0a93c1342e1b5519812203332aca8e
- https://git.kernel.org/stable/c/6d920a75df9a83ab096b3cde7a643b656e4fdfeb
- https://git.kernel.org/stable/c/75ecc80ef0614a9f8441ab476fb748d3e919bea8
- https://git.kernel.org/stable/c/8ada17dd4c4ffd6b94621e735d77eda196ce118f
- https://git.kernel.org/stable/c/b11a1e545ad7a2f8f9ba7276b4ae9429c3399456
- https://git.kernel.org/stable/c/d377bf743f29b41729a084a633874ef9c1a13c6a
- https://git.kernel.org/stable/c/d4be659a3e56f4eb16039ab8a1162efea086a714
- https://git.kernel.org/stable/c/f390b0e781ca689515b659f94ef05f01497ed833
JSON original (NVD)
Mostrar
{
"id": "CVE-2026-81005",
"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": "2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2",
"lessThan": "75ecc80ef0614a9f8441ab476fb748d3e919bea8",
"versionType": "git"
},
{
"status": "affected",
"version": "2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2",
"lessThan": "b11a1e545ad7a2f8f9ba7276b4ae9429c3399456",
"versionType": "git"
},
{
"status": "affected",
"version": "2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2",
"lessThan": "f390b0e781ca689515b659f94ef05f01497ed833",
"versionType": "git"
},
{
"status": "affected",
"version": "2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2",
"lessThan": "d377bf743f29b41729a084a633874ef9c1a13c6a",
"versionType": "git"
},
{
"status": "affected",
"version": "2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2",
"lessThan": "d4be659a3e56f4eb16039ab8a1162efea086a714",
"versionType": "git"
},
{
"status": "affected",
"version": "2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2",
"lessThan": "53af3a8bae0a93c1342e1b5519812203332aca8e",
"versionType": "git"
},
{
"status": "affected",
"version": "2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2",
"lessThan": "8ada17dd4c4ffd6b94621e735d77eda196ce118f",
"versionType": "git"
},
{
"status": "affected",
"version": "2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2",
"lessThan": "6d920a75df9a83ab096b3cde7a643b656e4fdfeb",
"versionType": "git"
},
{
"status": "affected",
"version": "288bd736c8a027040fc261c86a87b65e7bc3f6fa",
"versionType": "git"
},
{
"status": "affected",
"version": "4.18.10",
"lessThan": "4.19",
"versionType": "semver"
}
],
"programFiles": [
"drivers/char/ipmi/ipmi_msghandler.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.19"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.19",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.270",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.109",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3-rc1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/char/ipmi/ipmi_msghandler.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-09-11T20:19:09.173",
"references": [
{
"url": "https://git.kernel.org/stable/c/53af3a8bae0a93c1342e1b5519812203332aca8e",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/6d920a75df9a83ab096b3cde7a643b656e4fdfeb",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/75ecc80ef0614a9f8441ab476fb748d3e919bea8",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/8ada17dd4c4ffd6b94621e735d77eda196ce118f",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/b11a1e545ad7a2f8f9ba7276b4ae9429c3399456",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/d377bf743f29b41729a084a633874ef9c1a13c6a",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/d4be659a3e56f4eb16039ab8a1162efea086a714",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/f390b0e781ca689515b659f94ef05f01497ed833",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipmi: si: Fix NULL pointer dereference after failed registration\n\ntry_smi_init() allocates new_smi->si_sm and later calls\nipmi_register_smi_mod(), which maps to ipmi_add_smi().\n\nDuring ipmi_add_smi(), the upper IPMI message handler obtains the\ninitial BMC device information through __bmc_get_device_id(). This can\nfail if the BMC does not return a successful response to the Get Device\nID command.\n\nWhen the BMC returns a nonzero completion code, the device-id helper\nretries the command and eventually returns -EIO if the device ID still\ncannot be fetched.\n\nOn this failure path, ipmi_add_smi() logs \"Unable to get the device id\"\nand goes to out_err_started, where it invokes the lower driver's\nshutdown callback. try_smi_init() then logs the returned registration\nfailure:\n\n ipmi_si IPI0001:00: IPMI message handler: Unable to get the device id: -5\n ipmi_si IPI0001:00: Unable to register device: error -5\n\nFor ipmi_si, the shutdown callback is shutdown_smi(), which cleans up\nthe SI state machine data, frees smi_info->si_sm, and sets\nsmi_info->si_sm and smi_info->intf to NULL.\n\nHowever, intf->in_shutdown is not set on this failed-registration\nrollback path. Therefore, the asynchronous redo_bmc_reg work item can\nstill retry BMC device-id probing after the lower driver has already\ncleared its SI state machine data. In the observed case, that retry path\nreached start_next_msg(), which passed the NULL smi_info->si_sm pointer\nto the selected KCS state machine handler:\n\nBUG: unable to handle kernel NULL pointer dereference at 0000000000000000\nWorkqueue: events redo_bmc_reg [ipmi_msghandler]\nRIP: start_kcs_transaction+0x2c/0x190 [ipmi_si]\nCall Trace:\n start_next_msg+0x50/0x80 [ipmi_si]\n check_start_timer_thread.part.9+0x3b/0x50 [ipmi_si]\n sender+0x69/0x80 [ipmi_si]\n i_ipmi_request+0x2ac/0x9d0 [ipmi_msghandler]\n __get_device_id.isra.29+0xaa/0x180 [ipmi_msghandler]\n __bmc_get_device_id+0xef/0x950 [ipmi_msghandler]\n redo_bmc_reg+0x52/0x60 [ipmi_msghandler]\n process_one_work+0x1a7/0x360\n\nSet intf->in_shutdown on the out_err_started path before invoking the\nlower driver's shutdown callback. This prevents later redo_bmc_reg\nretries from using an interface whose lower driver state has been\ncleaned up, and applies the same shutdown state to other IPMI interfaces\nas well."
}
],
"lastModified": "2026-09-14T13:18:54.883",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}