CVE-2026-80563 (GCVE-0-2026-80563)

Vulnerability from cvelistv5 – Published: 2026-08-26 14:37 – Updated: 2026-08-26 14:37
VLAI
Title
gpio: sloppy-logic-analyzer: fix use-after-free via debugfs trigger on unbind
Summary
In the Linux kernel, the following vulnerability has been resolved: gpio: sloppy-logic-analyzer: fix use-after-free via debugfs trigger on unbind The "trigger" debugfs file has a hand-rolled ->write handler (trigger_write()) that dereferences the per-device gpio_la_poll_priv. The file is created with debugfs_create_file_unsafe(), and the handler never takes a debugfs reference. Nothing keeps the object alive while the handler runs. priv is allocated with devm_kzalloc(). devres frees it when the platform device is unbound. debugfs_create_file_unsafe() installs no full_proxy wrapper, so debugfs_remove_recursive() in gpio_la_poll_remove() does not wait for an in-flight trigger_write(). The blob_lock taken there does not help, because trigger_write() never takes it. A write that races an unbind therefore writes into freed memory: trigger_write() gpio_la_poll_remove() priv = m->private buf = memdup_user() [may sleep] mutex_lock(&priv->blob_lock) debugfs_remove_recursive() [no wait] mutex_unlock(&priv->blob_lock) (remove returns; devres frees priv) priv->trig_data = buf <-- use-after-free write priv->trig_len = count The race is reachable by root via /sys/bus/platform/drivers/gpio-sloppy-logic-analyzer/unbind. Create "trigger" with debugfs_create_file() instead. Its full_proxy wrapper makes debugfs_remove_recursive() drain any in-flight ->write before it returns. The use-after-free is confirmed under KASAN with a minimal reproducer of the same debugfs_create_file_unsafe() plus devm_kzalloc() pattern (available on request); it produces a slab-use-after-free write in the handler.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7828b7bbbf2074dd7dd14d87f50bc5ce9036d692 , < 49a1ebb1ef2c8ada300c174b65273810abb4e326 (git)
Affected: 7828b7bbbf2074dd7dd14d87f50bc5ce9036d692 , < 23e9f32c0c7d2043e39655cff5ee3ddf29a43f80 (git)
Affected: 7828b7bbbf2074dd7dd14d87f50bc5ce9036d692 , < 24bef4918f6ab806260476e2f93d8f791fd17449 (git)
Affected: 7828b7bbbf2074dd7dd14d87f50bc5ce9036d692 , < 44f3468a0aef1aabdad551898ab7cfa2a9d20e99 (git)
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Linux Linux Affected: 6.11
Unaffected: 0 , < 6.11 (semver)
Unaffected: 6.12.105 , ≤ 6.12.* (semver)
Unaffected: 6.18.46 , ≤ 6.18.* (semver)
Unaffected: 7.1.10 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpio/gpio-sloppy-logic-analyzer.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpio/gpio-sloppy-logic-analyzer.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "6.11"
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.46",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.10",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.105",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.46",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.10",
                  "versionStartIncluding": "6.11",
                  "vulnerable": true
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                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ngpio: sloppy-logic-analyzer: fix use-after-free via debugfs trigger on unbind\n\nThe \"trigger\" debugfs file has a hand-rolled -\u003ewrite handler\n(trigger_write()) that dereferences the per-device gpio_la_poll_priv. The\nfile is created with debugfs_create_file_unsafe(), and the handler never\ntakes a debugfs reference. Nothing keeps the object alive while the\nhandler runs.\n\npriv is allocated with devm_kzalloc(). devres frees it when the platform\ndevice is unbound. debugfs_create_file_unsafe() installs no full_proxy\nwrapper, so debugfs_remove_recursive() in gpio_la_poll_remove() does not\nwait for an in-flight trigger_write(). The blob_lock taken there does not\nhelp, because trigger_write() never takes it. A write that races an unbind\ntherefore writes into freed memory:\n\n  trigger_write()                  gpio_la_poll_remove()\n    priv = m-\u003eprivate\n    buf = memdup_user()  [may sleep]\n                                     mutex_lock(\u0026priv-\u003eblob_lock)\n                                     debugfs_remove_recursive()  [no wait]\n                                     mutex_unlock(\u0026priv-\u003eblob_lock)\n                                   (remove returns; devres frees priv)\n    priv-\u003etrig_data = buf   \u003c-- use-after-free write\n    priv-\u003etrig_len  = count\n\nThe race is reachable by root via\n/sys/bus/platform/drivers/gpio-sloppy-logic-analyzer/unbind.\n\nCreate \"trigger\" with debugfs_create_file() instead. Its full_proxy\nwrapper makes debugfs_remove_recursive() drain any in-flight -\u003ewrite\nbefore it returns.\n\nThe use-after-free is confirmed under KASAN with a minimal reproducer of\nthe same debugfs_create_file_unsafe() plus devm_kzalloc() pattern\n(available on request); it produces a slab-use-after-free write in the\nhandler."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-26T14:37:27.759Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/49a1ebb1ef2c8ada300c174b65273810abb4e326"
        },
        {
          "url": "https://git.kernel.org/stable/c/23e9f32c0c7d2043e39655cff5ee3ddf29a43f80"
        },
        {
          "url": "https://git.kernel.org/stable/c/24bef4918f6ab806260476e2f93d8f791fd17449"
        },
        {
          "url": "https://git.kernel.org/stable/c/44f3468a0aef1aabdad551898ab7cfa2a9d20e99"
        }
      ],
      "title": "gpio: sloppy-logic-analyzer: fix use-after-free via debugfs trigger on unbind",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80563",
    "datePublished": "2026-08-26T14:37:27.759Z",
    "dateReserved": "2026-08-26T14:34:25.767Z",
    "dateUpdated": "2026-08-26T14:37:27.759Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-80563\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-26T15:17:11.310\",\"lastModified\":\"2026-08-26T15:17:11.310\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ngpio: sloppy-logic-analyzer: fix use-after-free via debugfs trigger on unbind\\n\\nThe \\\"trigger\\\" debugfs file has a hand-rolled -\u003ewrite handler\\n(trigger_write()) that dereferences the per-device gpio_la_poll_priv. The\\nfile is created with debugfs_create_file_unsafe(), and the handler never\\ntakes a debugfs reference. Nothing keeps the object alive while the\\nhandler runs.\\n\\npriv is allocated with devm_kzalloc(). devres frees it when the platform\\ndevice is unbound. debugfs_create_file_unsafe() installs no full_proxy\\nwrapper, so debugfs_remove_recursive() in gpio_la_poll_remove() does not\\nwait for an in-flight trigger_write(). The blob_lock taken there does not\\nhelp, because trigger_write() never takes it. A write that races an unbind\\ntherefore writes into freed memory:\\n\\n  trigger_write()                  gpio_la_poll_remove()\\n    priv = m-\u003eprivate\\n    buf = memdup_user()  [may sleep]\\n                                     mutex_lock(\u0026priv-\u003eblob_lock)\\n                                     debugfs_remove_recursive()  [no wait]\\n                                     mutex_unlock(\u0026priv-\u003eblob_lock)\\n                                   (remove returns; devres frees priv)\\n    priv-\u003etrig_data = buf   \u003c-- use-after-free write\\n    priv-\u003etrig_len  = count\\n\\nThe race is reachable by root via\\n/sys/bus/platform/drivers/gpio-sloppy-logic-analyzer/unbind.\\n\\nCreate \\\"trigger\\\" with debugfs_create_file() instead. Its full_proxy\\nwrapper makes debugfs_remove_recursive() drain any in-flight -\u003ewrite\\nbefore it returns.\\n\\nThe use-after-free is confirmed under KASAN with a minimal reproducer of\\nthe same debugfs_create_file_unsafe() plus devm_kzalloc() pattern\\n(available on request); it produces a slab-use-after-free write in the\\nhandler.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/gpio/gpio-sloppy-logic-analyzer.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"7828b7bbbf2074dd7dd14d87f50bc5ce9036d692\",\"lessThan\":\"49a1ebb1ef2c8ada300c174b65273810abb4e326\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7828b7bbbf2074dd7dd14d87f50bc5ce9036d692\",\"lessThan\":\"23e9f32c0c7d2043e39655cff5ee3ddf29a43f80\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7828b7bbbf2074dd7dd14d87f50bc5ce9036d692\",\"lessThan\":\"24bef4918f6ab806260476e2f93d8f791fd17449\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7828b7bbbf2074dd7dd14d87f50bc5ce9036d692\",\"lessThan\":\"44f3468a0aef1aabdad551898ab7cfa2a9d20e99\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/gpio/gpio-sloppy-logic-analyzer.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.11\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.11\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.105\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.46\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.10\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/23e9f32c0c7d2043e39655cff5ee3ddf29a43f80\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/24bef4918f6ab806260476e2f93d8f791fd17449\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/44f3468a0aef1aabdad551898ab7cfa2a9d20e99\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/49a1ebb1ef2c8ada300c174b65273810abb4e326\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}



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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.

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  • 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.
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  • 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.