Vulnerability-Lookup

GHSA-58Q4-579W-9X9R

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-19 18:32

Details

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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-72066"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:21:16Z",
    "severity": "HIGH"
  },
  "details": "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.",
  "id": "GHSA-58q4-579w-9x9r",
  "modified": "2026-08-19T18:32:27Z",
  "published": "2026-08-15T06:32:11Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72066"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2408be459c70ef4250da1a9e50f5478e6b250d61"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/27481cf4365a6ff5c9be3590143e7ed434000266"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/61a73a123ac7a7fbc57382531f8cb7092d569aba"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/631d53102da9f469c96b882b770336bec095b833"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6cb15b81ff545840048fb0e1a6e827d560dbf367"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/86f436567f2516a0083b210bedc933544826a2c3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/998f66e9ce320f3433f60b948e3698b744754a46"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/de4d3d8ae17dc8b4cf8c59436c4b7e2dc2491635"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2026-08-15 05:52 – Updated: 2026-08-19 16:35

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

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/27481cf4365a6ff5c…
https://git.kernel.org/stable/c/2408be459c70ef425…
https://git.kernel.org/stable/c/de4d3d8ae17dc8b4c…
https://git.kernel.org/stable/c/998f66e9ce320f343…
https://git.kernel.org/stable/c/61a73a123ac7a7fbc…
https://git.kernel.org/stable/c/6cb15b81ff5458400…
https://git.kernel.org/stable/c/631d53102da9f469c…
https://git.kernel.org/stable/c/86f436567f2516a00…

Impacted products

2 products

Vendor	Product	Version
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)
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)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/cpu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "lessThan": "27481cf4365a6ff5c9be3590143e7ed434000266",
              "status": "affected",
              "version": "98f8cdce1db580b99fce823a48eea2cb2bdb261e",
              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "de4d3d8ae17dc8b4cf8c59436c4b7e2dc2491635",
              "status": "affected",
              "version": "98f8cdce1db580b99fce823a48eea2cb2bdb261e",
              "versionType": "git"
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            {
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              "status": "affected",
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              "versionType": "git"
            },
            {
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              "versionType": "git"
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            {
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              "status": "affected",
              "version": "98f8cdce1db580b99fce823a48eea2cb2bdb261e",
              "versionType": "git"
            },
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              "status": "affected",
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              "version": "4.6"
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            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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            {
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              "status": "unaffected",
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              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
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            {
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              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                {
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                {
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      "descriptions": [
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          "lang": "en",
          "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "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"
          },
          "scenarios": [
            {
              "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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        "dateUpdated": "2026-08-19T16:35:55.630Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        {
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          "url": "https://git.kernel.org/stable/c/631d53102da9f469c96b882b770336bec095b833"
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        {
          "url": "https://git.kernel.org/stable/c/86f436567f2516a0083b210bedc933544826a2c3"
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      "title": "cpu: hotplug: Bound hotplug states sysfs output",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72066",
    "datePublished": "2026-08-15T05:52:19.527Z",
    "dateReserved": "2026-08-09T03:40:39.903Z",
    "dateUpdated": "2026-08-19T16:35:55.630Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

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GHSA-58Q4-579W-9X9R

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

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Nomenclature