GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2026-81007 (GCVE-0-2026-81007)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:42 – Updated: 2026-09-14 11:59
VLAI
Title
ipmi: ipmb: validate write message length
Summary
In the Linux kernel, the following vulnerability has been resolved: ipmi: ipmb: validate write message length ipmb_write() read message fields before validating the length byte. A zero or short write can read uninitialized stack bytes. A length smaller than the SMBus header underflows the block write length. Require a non-empty buffer and the minimum IPMB request length. Also require the length byte plus payload before parsing the message.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 51bd6f291583684f495ea498984dfc22049d7fd2 , < 8990c7f6bfc1e7689b7012a7d4d0efb9f07a9c89 (git)
Affected: 51bd6f291583684f495ea498984dfc22049d7fd2 , < 94f8d20153e348c79bc14dc25f873470518892da (git)
Affected: 51bd6f291583684f495ea498984dfc22049d7fd2 , < e527cd4e80066e1ed070fdc7c705bde340cdcc62 (git)
Affected: 51bd6f291583684f495ea498984dfc22049d7fd2 , < 7d66d54b974cff0a959e188af844d2d110422767 (git)
Affected: 51bd6f291583684f495ea498984dfc22049d7fd2 , < 60939bcda6f3f104ef456fdbf3cc5733c0720fb1 (git)
Affected: 51bd6f291583684f495ea498984dfc22049d7fd2 , < 5719431ca2b5fa26560bb38f6202f8b97fa3bbb0 (git)
Affected: 51bd6f291583684f495ea498984dfc22049d7fd2 , < a84c6e3d188f2c6e674910929eb790634299d6d5 (git)
Affected: 51bd6f291583684f495ea498984dfc22049d7fd2 , < 53637506884dbd5c91a89b1a3547d99d80f8ed2c (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.3
Unaffected: 0 , < 5.3 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/char/ipmi/ipmb_dev_int.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "8990c7f6bfc1e7689b7012a7d4d0efb9f07a9c89",
              "status": "affected",
              "version": "51bd6f291583684f495ea498984dfc22049d7fd2",
              "versionType": "git"
            },
            {
              "lessThan": "94f8d20153e348c79bc14dc25f873470518892da",
              "status": "affected",
              "version": "51bd6f291583684f495ea498984dfc22049d7fd2",
              "versionType": "git"
            },
            {
              "lessThan": "e527cd4e80066e1ed070fdc7c705bde340cdcc62",
              "status": "affected",
              "version": "51bd6f291583684f495ea498984dfc22049d7fd2",
              "versionType": "git"
            },
            {
              "lessThan": "7d66d54b974cff0a959e188af844d2d110422767",
              "status": "affected",
              "version": "51bd6f291583684f495ea498984dfc22049d7fd2",
              "versionType": "git"
            },
            {
              "lessThan": "60939bcda6f3f104ef456fdbf3cc5733c0720fb1",
              "status": "affected",
              "version": "51bd6f291583684f495ea498984dfc22049d7fd2",
              "versionType": "git"
            },
            {
              "lessThan": "5719431ca2b5fa26560bb38f6202f8b97fa3bbb0",
              "status": "affected",
              "version": "51bd6f291583684f495ea498984dfc22049d7fd2",
              "versionType": "git"
            },
            {
              "lessThan": "a84c6e3d188f2c6e674910929eb790634299d6d5",
              "status": "affected",
              "version": "51bd6f291583684f495ea498984dfc22049d7fd2",
              "versionType": "git"
            },
            {
              "lessThan": "53637506884dbd5c91a89b1a3547d99d80f8ed2c",
              "status": "affected",
              "version": "51bd6f291583684f495ea498984dfc22049d7fd2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/char/ipmi/ipmb_dev_int.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.3"
            },
            {
              "lessThan": "5.3",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.270",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.221",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.109",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.50",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.4",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "5.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "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\u003cmsg[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": "2026-09-14T11:59:40.685Z",
        "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": "2026-09-14T11:59:40.685Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-81007",
      "date": "2026-09-17",
      "epss": "0.00126",
      "percentile": "0.02584"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "drivers/char/ipmi/ipmb_dev_int.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "8990c7f6bfc1e7689b7012a7d4d0efb9f07a9c89",
                    "status": "affected",
                    "version": "51bd6f291583684f495ea498984dfc22049d7fd2",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "94f8d20153e348c79bc14dc25f873470518892da",
                    "status": "affected",
                    "version": "51bd6f291583684f495ea498984dfc22049d7fd2",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "e527cd4e80066e1ed070fdc7c705bde340cdcc62",
                    "status": "affected",
                    "version": "51bd6f291583684f495ea498984dfc22049d7fd2",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "7d66d54b974cff0a959e188af844d2d110422767",
                    "status": "affected",
                    "version": "51bd6f291583684f495ea498984dfc22049d7fd2",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "60939bcda6f3f104ef456fdbf3cc5733c0720fb1",
                    "status": "affected",
                    "version": "51bd6f291583684f495ea498984dfc22049d7fd2",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "5719431ca2b5fa26560bb38f6202f8b97fa3bbb0",
                    "status": "affected",
                    "version": "51bd6f291583684f495ea498984dfc22049d7fd2",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "a84c6e3d188f2c6e674910929eb790634299d6d5",
                    "status": "affected",
                    "version": "51bd6f291583684f495ea498984dfc22049d7fd2",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "53637506884dbd5c91a89b1a3547d99d80f8ed2c",
                    "status": "affected",
                    "version": "51bd6f291583684f495ea498984dfc22049d7fd2",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "drivers/char/ipmi/ipmb_dev_int.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "5.3"
                  },
                  {
                    "lessThan": "5.3",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.10.*",
                    "status": "unaffected",
                    "version": "5.10.270",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.15.*",
                    "status": "unaffected",
                    "version": "5.15.221",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.1.*",
                    "status": "unaffected",
                    "version": "6.1.188",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.6.*",
                    "status": "unaffected",
                    "version": "6.6.157",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.12.*",
                    "status": "unaffected",
                    "version": "6.12.109",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.18.*",
                    "status": "unaffected",
                    "version": "6.18.50",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "7.2.*",
                    "status": "unaffected",
                    "version": "7.2.4",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "7.3-rc1",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "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."
          }
        ],
        "id": "CVE-2026-81007",
        "lastModified": "2026-09-14T13:18:55.033",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.1,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.2,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-09-11T20:19:09.443",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/53637506884dbd5c91a89b1a3547d99d80f8ed2c"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/5719431ca2b5fa26560bb38f6202f8b97fa3bbb0"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/60939bcda6f3f104ef456fdbf3cc5733c0720fb1"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7d66d54b974cff0a959e188af844d2d110422767"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/8990c7f6bfc1e7689b7012a7d4d0efb9f07a9c89"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/94f8d20153e348c79bc14dc25f873470518892da"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a84c6e3d188f2c6e674910929eb790634299d6d5"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e527cd4e80066e1ed070fdc7c705bde340cdcc62"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:04:12Z",
      "cve": "CVE-2026-81007",
      "id": "CVE-2026-81007",
      "initial_release_date": "2026-09-15T01:04:12Z",
      "product_status:known_affected": "176",
      "product_status:known_not_affected": "177",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-81007",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-81007.json",
      "version": "2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.