CVE-2026-81005
- Source
- https://cve.org/CVERecord?id=CVE-2026-81005
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-81005.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-81005
- Downstream
- Published
- 2026-09-11T19:42:57Z
- Modified
- 2026-09-13T03:47:11Z
- Summary
- ipmi: si: Fix NULL pointer dereference after failed registration
- Details
-
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.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81005.json" }- References
-
- https://git.kernel.org/stable/c/53af3a8bae0a93c1342e1b5519812203332aca8e
- https://git.kernel.org/stable/c/6d920a75df9a83ab096b3cde7a643b656e4fdfeb
- https://git.kernel.org/stable/c/8ada17dd4c4ffd6b94621e735d77eda196ce118f
- https://git.kernel.org/stable/c/d4be659a3e56f4eb16039ab8a1162efea086a714
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/81xxx/CVE-2026-81005.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-81005
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2Fixedd4be659a3e56f4eb16039ab8a1162efea086a714Fixed53af3a8bae0a93c1342e1b5519812203332aca8eFixed8ada17dd4c4ffd6b94621e735d77eda196ce118fFixed6d920a75df9a83ab096b3cde7a643b656e4fdfeb
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedLast Affected288bd736c8a027040fc261c86a87b65e7bc3f6fa
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced4.18.10Fixed4.19