{"id":"CVE-2026-81005","state":"PUBLISHED","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.","publishedAt":"2026-09-11T19:42:57.460Z","updatedAt":"2026-10-19T08:46:29.573Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2","status":"affected","lessThan":"75ecc80ef0614a9f8441ab476fb748d3e919bea8","versionType":"git"},{"version":"2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2","status":"affected","lessThan":"b11a1e545ad7a2f8f9ba7276b4ae9429c3399456","versionType":"git"},{"version":"2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2","status":"affected","lessThan":"f390b0e781ca689515b659f94ef05f01497ed833","versionType":"git"},{"version":"2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2","status":"affected","lessThan":"d377bf743f29b41729a084a633874ef9c1a13c6a","versionType":"git"},{"version":"2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2","status":"affected","lessThan":"d4be659a3e56f4eb16039ab8a1162efea086a714","versionType":"git"},{"version":"2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2","status":"affected","lessThan":"53af3a8bae0a93c1342e1b5519812203332aca8e","versionType":"git"},{"version":"2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2","status":"affected","lessThan":"8ada17dd4c4ffd6b94621e735d77eda196ce118f","versionType":"git"},{"version":"2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2","status":"affected","lessThan":"6d920a75df9a83ab096b3cde7a643b656e4fdfeb","versionType":"git"},{"version":"288bd736c8a027040fc261c86a87b65e7bc3f6fa","status":"affected","versionType":"git"},{"version":"4.18.10","status":"affected","lessThan":"4.19","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/char/ipmi/ipmi_msghandler.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.19","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.109","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/char/ipmi/ipmi_msghandler.c"]}],"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"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:15.269Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/81xxx/CVE-2026-81005.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-81005","state":"PUBLISHED","datePublished":"2026-09-11T19:42:57.460Z","dateUpdated":"2026-10-19T08:46:29.573Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-26T14:34:25.812Z"},"containers":{"cna":{"title":"ipmi: si: Fix NULL pointer dereference after failed registration","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2","status":"affected","lessThan":"75ecc80ef0614a9f8441ab476fb748d3e919bea8","versionType":"git"},{"version":"2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2","status":"affected","lessThan":"b11a1e545ad7a2f8f9ba7276b4ae9429c3399456","versionType":"git"},{"version":"2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2","status":"affected","lessThan":"f390b0e781ca689515b659f94ef05f01497ed833","versionType":"git"},{"version":"2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2","status":"affected","lessThan":"d377bf743f29b41729a084a633874ef9c1a13c6a","versionType":"git"},{"version":"2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2","status":"affected","lessThan":"d4be659a3e56f4eb16039ab8a1162efea086a714","versionType":"git"},{"version":"2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2","status":"affected","lessThan":"53af3a8bae0a93c1342e1b5519812203332aca8e","versionType":"git"},{"version":"2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2","status":"affected","lessThan":"8ada17dd4c4ffd6b94621e735d77eda196ce118f","versionType":"git"},{"version":"2512e40e48d21d8bac09f7e91d2c3ceb2d3b50b2","status":"affected","lessThan":"6d920a75df9a83ab096b3cde7a643b656e4fdfeb","versionType":"git"},{"version":"288bd736c8a027040fc261c86a87b65e7bc3f6fa","status":"affected","versionType":"git"},{"version":"4.18.10","status":"affected","lessThan":"4.19","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/char/ipmi/ipmi_msghandler.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.19","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.109","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/char/ipmi/ipmi_msghandler.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T08:46:29.573Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"5.10.270"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"5.15.221"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.12.109"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.18.50"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"7.2.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"7.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.18.10"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}