{"id":"CVE-2026-81005","revision":"79fc7f2bfa55441c8ec32b5529cfed5f","records":[{"revision":"79fc7f2bfa55441c8ec32b5529cfed5f","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-81005","aliases":[],"title":"ipmi: si: Fix NULL pointer dereference after failed registration","description":"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.","state":0,"publishedAt":"2026-09-11T19:42:57.46+00:00","modifiedAt":"2026-10-19T08:46:29.573+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/char/ipmi/ipmi_msghandler.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2\",\n                            \"lessThan\": \"75ecc80ef0614a9f8441ab476fb748d3e919bea8\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2\",\n                            \"lessThan\": \"b11a1e545ad7a2f8f9ba7276b4ae9429c3399456\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2\",\n                            \"lessThan\": \"f390b0e781ca689515b659f94ef05f01497ed833\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2\",\n                            \"lessThan\": \"d377bf743f29b41729a084a633874ef9c1a13c6a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2\",\n                            \"lessThan\": \"d4be659a3e56f4eb16039ab8a1162efea086a714\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2\",\n                            \"lessThan\": \"53af3a8bae0a93c1342e1b5519812203332aca8e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2\",\n                            \"lessThan\": \"8ada17dd4c4ffd6b94621e735d77eda196ce118f\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2\",\n                            \"lessThan\": \"6d920a75df9a83ab096b3cde7a643b656e4fdfeb\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"288bd736c8a027040fc261c86a87b65e7bc3f6fa\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4.18.10\",\n                            \"lessThan\": \"4.19\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/char/ipmi/ipmi_msghandler.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.19\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.19\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.270\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.109\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.50\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.4\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/75ecc80ef0614a9f8441ab476fb748d3e919bea8","https://git.kernel.org/stable/c/b11a1e545ad7a2f8f9ba7276b4ae9429c3399456","https://git.kernel.org/stable/c/f390b0e781ca689515b659f94ef05f01497ed833","https://git.kernel.org/stable/c/d377bf743f29b41729a084a633874ef9c1a13c6a","https://git.kernel.org/stable/c/d4be659a3e56f4eb16039ab8a1162efea086a714","https://git.kernel.org/stable/c/53af3a8bae0a93c1342e1b5519812203332aca8e","https://git.kernel.org/stable/c/8ada17dd4c4ffd6b94621e735d77eda196ce118f","https://git.kernel.org/stable/c/6d920a75df9a83ab096b3cde7a643b656e4fdfeb"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-81005","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-81005","identifiers":["CVE-2026-81005"]},"retained":false,"historicalAffected":[]}],"coverage":[]}