CVE-2026-72066 (GCVE-0-2026-72066)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:52 – Updated: 2026-10-19 21:19
VLAI
Title
cpu: hotplug: Bound hotplug states sysfs output
Summary
In the Linux kernel, the following vulnerability has been resolved: cpu: hotplug: Bound hotplug states sysfs output states_show() adds CPU hotplug state names into a single sysfs buffer using sprintf(). With enough registered states, this can write past the end of the PAGE_SIZE buffer. Use sysfs_emit_at() so output is bounded.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:51 UTC
CWE
  • CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6992 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 98f8cdce1db580b99fce823a48eea2cb2bdb261e , < 27481cf4365a6ff5c9be3590143e7ed434000266 (git)
Affected: 98f8cdce1db580b99fce823a48eea2cb2bdb261e , < 2408be459c70ef4250da1a9e50f5478e6b250d61 (git)
Affected: 98f8cdce1db580b99fce823a48eea2cb2bdb261e , < de4d3d8ae17dc8b4cf8c59436c4b7e2dc2491635 (git)
Affected: 98f8cdce1db580b99fce823a48eea2cb2bdb261e , < 998f66e9ce320f3433f60b948e3698b744754a46 (git)
Affected: 98f8cdce1db580b99fce823a48eea2cb2bdb261e , < 61a73a123ac7a7fbc57382531f8cb7092d569aba (git)
Affected: 98f8cdce1db580b99fce823a48eea2cb2bdb261e , < 6cb15b81ff545840048fb0e1a6e827d560dbf367 (git)
Affected: 98f8cdce1db580b99fce823a48eea2cb2bdb261e , < 631d53102da9f469c96b882b770336bec095b833 (git)
Affected: 98f8cdce1db580b99fce823a48eea2cb2bdb261e , < 86f436567f2516a0083b210bedc933544826a2c3 (git)
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Linux Linux Affected: 4.6
Unaffected: 0 , < 4.6 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-120"
              }
            ],
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T19:48:49+00:00",
      "cve": "CVE-2026-72066",
      "id": "CVE-2026-72066",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "246",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: cpu: hotplug: Bound hotplug states sysfs output",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72066.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
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                  "content": {
                    "id": "CVE-2026-72066",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-10-16T15:51:15.720754Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "cweId": "CWE-120",
                    "description": "CWE-120 Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-10-16T15:51:16.340Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
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              "product": "Linux",
              "programFiles": [
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              "vendor": "Linux",
              "versions": [
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                  "version": "4.6"
                },
                {
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                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
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                  "status": "unaffected",
                  "version": "5.10.265",
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                {
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                  "status": "unaffected",
                  "version": "5.15.212",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.178",
                  "versionType": "semver"
                },
                {
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                  "version": "6.6.145",
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                  "version": "6.12.97",
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                },
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                },
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                  "status": "unaffected",
                  "version": "7.1.5",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "7.2",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
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                      "vulnerable": true
                    },
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              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncpu: hotplug: Bound hotplug states sysfs output\n\nstates_show() adds CPU hotplug state names into a single sysfs buffer\nusing sprintf(). With enough registered states, this can write past the\nend of the PAGE_SIZE buffer.\n\nUse sysfs_emit_at() so output is bounded."
            }
          ],
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                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
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                  "lang": "en",
                  "value": "AV:L - The bug is in states_show() on the read path for /sys/devices/system/cpu/hotplug/states, reached only via a local sysfs/VFS read() syscall. No network packet handler, adjacent protocol, or physical attach path invokes this CPU hotplug sysfs callback.\nAC:L - Once enough CPU hotplug states are registered (plausible on cloud servers, KVM hosts, Android, and heavily configured distros with hundreds of cpuhp_setup_state() users), a single read deterministically executes unbounded sprintf() past the PAGE_SIZE buffer with no race or attacker-uncontrollable timing.\nPR:L - states is DEVICE_ATTR_RO (mode 0444), so any unprivileged local user can open and read /sys/devices/system/cpu/hotplug/states. states_show() performs no capability, namespace, or credential check before formatting output into the sysfs buffer.\nUI:N - Exploitation requires only the attacker reading the sysfs attribute; no victim mount, driver bind, module load, or other interactive action is needed beyond the attacker\u0027s own read once sufficient hotplug states exist at boot.\nS:U - The out-of-bounds write corrupts kernel heap memory within the same OS/kernel security authority. This is standard kernel memory corruption, not a KVM guest-to-host escape, IOMMU boundary bypass, or other cross-scope boundary violation.\nC:H - Unbounded sprintf() writes past the fixed PAGE_SIZE buffer allocated by sysfs_kf_seq_show(), corrupting adjacent kmalloc heap memory. Per kernel guidance, this class of memory-corruption OOB write can be leveraged for arbitrary kernel memory disclosure.\nI:H - The vulnerable loop advances buf and repeatedly sprintf()s without bounds, producing a kernel heap out-of-bounds write that can corrupt adjacent objects and enable control-flow hijacking or arbitrary kernel writes per OOB-write scoring guidance.\nA:H - Writing past the PAGE_SIZE sysfs show buffer corrupts adjacent kernel heap objects and can cause immediate kernel oops/panic during the read path or when corrupted adjacent allocations are later used, satisfying High availability impact."
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            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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              "url": "https://git.kernel.org/stable/c/86f436567f2516a0083b210bedc933544826a2c3"
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        "assignerShortName": "Linux",
        "cveId": "CVE-2026-72066",
        "datePublished": "2026-08-15T05:52:19.527Z",
        "dateReserved": "2026-08-09T03:40:39.903Z",
        "dateUpdated": "2026-10-19T21:19:26.150Z",
        "state": "PUBLISHED"
      },
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    }
  }
}



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