{"api_version":"1","generated_at":"2026-10-28T07:33:02+00:00","cve":"CVE-2026-81007","urls":{"html":"https://cve.report/CVE-2026-81007","api":"https://cve.report/api/cve/CVE-2026-81007.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-81007","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-81007"},"summary":{"title":"ipmi: ipmb: validate write message length","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nipmi: ipmb: validate write message length\n\nipmb_write() read message fields before validating the length byte.\n\nA zero or short write can read uninitialized stack bytes.\n\nA length smaller than the SMBus header underflows the block write length.\n\nRequire a non-empty buffer and the minimum IPMB request length.\n\nAlso require the length byte plus payload before parsing the message.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-11 20:19:09","updated_at":"2026-10-19 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Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-81007","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 51bd6f291583684f495ea498984dfc22049d7fd2 8990c7f6bfc1e7689b7012a7d4d0efb9f07a9c89 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 51bd6f291583684f495ea498984dfc22049d7fd2 94f8d20153e348c79bc14dc25f873470518892da git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 51bd6f291583684f495ea498984dfc22049d7fd2 e527cd4e80066e1ed070fdc7c705bde340cdcc62 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 51bd6f291583684f495ea498984dfc22049d7fd2 7d66d54b974cff0a959e188af844d2d110422767 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"81007","cve":"CVE-2026-81007","epss":"0.001250000","percentile":"0.025170000","score_date":"2026-09-14","updated_at":"2026-09-15 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the Linux kernel, the following vulnerability has been resolved:\n\nipmi: ipmb: validate write message length\n\nipmb_write() read message fields before validating the length byte.\n\nA zero or short write can read uninitialized stack bytes.\n\nA length smaller than the SMBus header underflows the block write length.\n\nRequire a non-empty buffer and the minimum IPMB request length.\n\nAlso require the length byte plus payload before parsing the message."}],"metrics":[{"cvssV3_1":{"baseScore":7.1,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:L - ipmb_write() is the miscdevice write handler for /dev/ipmb-N and is reached only via a local write(2) on that character device. The I2C slave callback queues inbound IPMB requests for read() and does not enter this path.\nAC:L - A single write of count 0, or a 1-byte write with length field 0, bypasses the old count<msg[0] check and underflows the I2C/SMBus length. The attacker fully controls the buffer; no race or uninfluenced memory layout is required.\nPR:L - Neither ipmb_write() nor misc_open() performs a capability check; access is only DAC on /dev/ipmb-N. BMC and satellite-MC deployments (OpenBMC ipmbbridge, OpenIPMI) commonly grant this node to a non-root management or service account rather than requiring init-namespace root.\nUI:N - The attacker triggers the bug entirely with their own write(2) to an already-present /dev/ipmb-N node. No other user must open a file, mount a filesystem, or otherwise interact.\nS:U - The out-of-bounds stack read and resulting kernel oops remain inside the same host kernel security authority. IPMB/I2C is an in-chassis management bus, not a VM, IOMMU, or sandbox boundary crossing.\nC:H - On i2c-protocol devices (usual OpenBMC/Aspeed DT), a zero length byte promotes to i2c_msg.len 65535, so i2c_transfer/DMA helpers read tens of kilobytes past the 240-byte stack buffer, disclosing kernel stack contents onto the IPMB bus.\nI:N - The defect is an out-of-bounds read of a stack buffer used as an I2C write payload. It does not write kernel memory, corrupt heap objects, or yield a control-flow or arbitrary-write primitive.\nA:H - The 65535-byte stack over-read walks off the kernel stack. Aspeed I2C (typical OpenBMC IPMB adapter) has no max_write_len quirk, so the transfer or memcpy hits the VMAP_STACK guard page and oopses the kernel."}]}],"providerMetadata":{"dateUpdated":"2026-10-19T08:46:32.534Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/8990c7f6bfc1e7689b7012a7d4d0efb9f07a9c89"},{"url":"https://git.kernel.org/stable/c/94f8d20153e348c79bc14dc25f873470518892da"},{"url":"https://git.kernel.org/stable/c/e527cd4e80066e1ed070fdc7c705bde340cdcc62"},{"url":"https://git.kernel.org/stable/c/7d66d54b974cff0a959e188af844d2d110422767"},{"url":"https://git.kernel.org/stable/c/60939bcda6f3f104ef456fdbf3cc5733c0720fb1"},{"url":"https://git.kernel.org/stable/c/5719431ca2b5fa26560bb38f6202f8b97fa3bbb0"},{"url":"https://git.kernel.org/stable/c/a84c6e3d188f2c6e674910929eb790634299d6d5"},{"url":"https://git.kernel.org/stable/c/53637506884dbd5c91a89b1a3547d99d80f8ed2c"}],"title":"ipmi: ipmb: validate write message length","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-81007","datePublished":"2026-09-11T19:42:58.751Z","dateReserved":"2026-08-26T14:34:25.812Z","dateUpdated":"2026-10-19T08:46:32.534Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-11 20:19:09","lastModifiedDate":"2026-10-19 09:17:34","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H","baseScore":7.1,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.2}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"81007","Ordinal":"1","Title":"ipmi: ipmb: validate write message length","CVE":"CVE-2026-81007","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"81007","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nipmi: ipmb: validate write message length\n\nipmb_write() read message fields before validating the length byte.\n\nA zero or short write can read uninitialized stack bytes.\n\nA length smaller than the SMBus header underflows the block write length.\n\nRequire a non-empty buffer and the minimum IPMB request length.\n\nAlso require the length byte plus payload before parsing the message.","Type":"Description","Title":"ipmi: ipmb: validate write message length"}]}}}