Vulnerability-Lookup

GHSA-PP22-5W4F-HC5V

Vulnerability from github – Published: 2026-07-19 18:31 – Updated: 2026-07-20 15:31

Details

In the Linux kernel, the following vulnerability has been resolved:

gpio: aggregator: fix a potential use-after-free

On error we free aggr->lookups->dev_id before removing the entry from the lookup table. If a concurrent thread calls gpiod_find() before we remove the entry, it could iterate over the list and call gpiod_match_lookup_table() which unconditionally dereferences dev_id when calling strcmp(). Reverse the order of cleanup.

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-2026-64023"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T16:17:42Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ngpio: aggregator: fix a potential use-after-free\n\nOn error we free aggr-\u003elookups-\u003edev_id before removing the entry from\nthe lookup table. If a concurrent thread calls gpiod_find() before we\nremove the entry, it could iterate over the list and call\ngpiod_match_lookup_table() which unconditionally dereferences dev_id\nwhen calling strcmp(). Reverse the order of cleanup.",
  "id": "GHSA-pp22-5w4f-hc5v",
  "modified": "2026-07-20T15:31:56Z",
  "published": "2026-07-19T18:31:49Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64023"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/30c073cab97afb31901f94de9605177b6b84367e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7ac4183a41ba048af89eddd82fe8be64619d0871"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ea28b286649b70618e9dd3e895812417a7712a11"
    }
  ],
  "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-2026-64023 (GCVE-0-2026-64023)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:39 – Updated: 2026-08-05 12:38

Title

gpio: aggregator: fix a potential use-after-free

Summary

In the Linux kernel, the following vulnerability has been resolved: gpio: aggregator: fix a potential use-after-free On error we free aggr->lookups->dev_id before removing the entry from the lookup table. If a concurrent thread calls gpiod_find() before we remove the entry, it could iterate over the list and call gpiod_match_lookup_table() which unconditionally dereferences dev_id when calling strcmp(). Reverse the order of cleanup.

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

3 references

URL	Tags
https://git.kernel.org/stable/c/ea28b286649b70618…
https://git.kernel.org/stable/c/7ac4183a41ba048af…
https://git.kernel.org/stable/c/30c073cab97afb319…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 86f162e73d2d81ef6d819c06a3b6c2fda77a79b8 , < ea28b286649b70618e9dd3e895812417a7712a11 (git) Affected: 86f162e73d2d81ef6d819c06a3b6c2fda77a79b8 , < 7ac4183a41ba048af89eddd82fe8be64619d0871 (git) Affected: 86f162e73d2d81ef6d819c06a3b6c2fda77a79b8 , < 30c073cab97afb31901f94de9605177b6b84367e (git)
Linux	Linux	Affected: 6.16 Unaffected: 0 , < 6.16 (semver) Unaffected: 6.18.34 , ≤ 6.18.* (semver) Unaffected: 7.0.11 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpio/gpio-aggregator.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ea28b286649b70618e9dd3e895812417a7712a11",
              "status": "affected",
              "version": "86f162e73d2d81ef6d819c06a3b6c2fda77a79b8",
              "versionType": "git"
            },
            {
              "lessThan": "7ac4183a41ba048af89eddd82fe8be64619d0871",
              "status": "affected",
              "version": "86f162e73d2d81ef6d819c06a3b6c2fda77a79b8",
              "versionType": "git"
            },
            {
              "lessThan": "30c073cab97afb31901f94de9605177b6b84367e",
              "status": "affected",
              "version": "86f162e73d2d81ef6d819c06a3b6c2fda77a79b8",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpio/gpio-aggregator.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
              "lessThan": "6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.34",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.11",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngpio: aggregator: fix a potential use-after-free\n\nOn error we free aggr-\u003elookups-\u003edev_id before removing the entry from\nthe lookup table. If a concurrent thread calls gpiod_find() before we\nremove the entry, it could iterate over the list and call\ngpiod_match_lookup_table() which unconditionally dereferences dev_id\nwhen calling strcmp(). Reverse the order of cleanup."
        }
      ],
      "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 - Exploitation requires writing to the gpio-aggregator configfs interface at /sys/kernel/config/gpio-aggregator/ (live attribute) or equivalent sysfs driver attributes; there is no network, adjacent, or physical attack path.\nAC:L - The attacker can reliably win the race by concurrently triggering failed aggregator activation (live=1 with probe-forcing config) and GPIO lookup activity (gpiod_find via parallel activations or device probing); both race sides are attacker-controlled.\nPR:L - Default configfs/sysfs access is root-only, but industrial/embedded GPIO-aggregator deployments commonly delegate configfs management to local service accounts; any local user with write access to the gpio-aggregator configfs tree can exploit without full init-namespace root.\nUI:N - Exploitation is fully attacker-driven through configfs writes and concurrent threads; no victim interaction is required.\nS:U - Impact is confined to kernel memory via the GPIO lookup-table UAF; this is standard local kernel privilege escalation/memory corruption, not a cross-boundary escape (VM, IOMMU, or sandbox).\nC:H - The use-after-free dereferences freed dev_id memory in strcmp() during gpiod_match_lookup_table(), enabling arbitrary kernel heap reads and information disclosure.\nI:H - Use-after-free on a global lookup-table entry can be leveraged with heap grooming for memory corruption and potential arbitrary write or code execution, not merely a bounded modification.\nA:H - Dereferencing freed dev_id memory can cause kernel oops/panic from invalid memory access; UAF bugs inherently threaten system availability even when not fully exploited."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:38:17.707Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ea28b286649b70618e9dd3e895812417a7712a11"
        },
        {
          "url": "https://git.kernel.org/stable/c/7ac4183a41ba048af89eddd82fe8be64619d0871"
        },
        {
          "url": "https://git.kernel.org/stable/c/30c073cab97afb31901f94de9605177b6b84367e"
        }
      ],
      "title": "gpio: aggregator: fix a potential use-after-free",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64023",
    "datePublished": "2026-07-19T15:39:15.980Z",
    "dateReserved": "2026-07-19T07:54:57.027Z",
    "dateUpdated": "2026-08-05T12:38:17.707Z",
    "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.

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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-PP22-5W4F-HC5V

CVE-2026-64023 (GCVE-0-2026-64023)

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