CVE-2026-81005 (GCVE-0-2026-81005)
Vulnerability from cvelistv5
Published
2026-09-11 19:42
Modified
2026-10-19 08:46
Severity ?
Summary
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. 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: 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 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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2
Version: 2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2
Version: 2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2
Version: 2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2
Version: 2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2
Version: 2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2
Version: 2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2
Version: 2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2
Version: 288bd736c8a027040fc261c86a87b65e7bc3f6fa
Version: 4.18.10   ≤
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{
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            "drivers/char/ipmi/ipmi_msghandler.c"
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              "negate": false,
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      "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-\u003esi_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\u0027s\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-\u003esi_sm, and sets\nsmi_info-\u003esi_sm and smi_info-\u003eintf to NULL.\n\nHowever, intf-\u003ein_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-\u003esi_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-\u003ein_shutdown on the out_err_started path before invoking the\nlower driver\u0027s 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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:46:29.573Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/75ecc80ef0614a9f8441ab476fb748d3e919bea8"
        },
        {
          "url": "https://git.kernel.org/stable/c/b11a1e545ad7a2f8f9ba7276b4ae9429c3399456"
        },
        {
          "url": "https://git.kernel.org/stable/c/f390b0e781ca689515b659f94ef05f01497ed833"
        },
        {
          "url": "https://git.kernel.org/stable/c/d377bf743f29b41729a084a633874ef9c1a13c6a"
        },
        {
          "url": "https://git.kernel.org/stable/c/d4be659a3e56f4eb16039ab8a1162efea086a714"
        },
        {
          "url": "https://git.kernel.org/stable/c/53af3a8bae0a93c1342e1b5519812203332aca8e"
        },
        {
          "url": "https://git.kernel.org/stable/c/8ada17dd4c4ffd6b94621e735d77eda196ce118f"
        },
        {
          "url": "https://git.kernel.org/stable/c/6d920a75df9a83ab096b3cde7a643b656e4fdfeb"
        }
      ],
      "title": "ipmi: si: Fix NULL pointer dereference after failed registration",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-81005",
    "datePublished": "2026-09-11T19:42:57.460Z",
    "dateReserved": "2026-08-26T14:34:25.812Z",
    "dateUpdated": "2026-10-19T08:46:29.573Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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