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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": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpio/gpio-sloppy-logic-analyzer.c"
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          "vendor": "Linux",
          "versions": [
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          "vendor": "Linux",
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              "versionType": "semver"
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        {
          "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."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-08-26T14:37:27.759Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/49a1ebb1ef2c8ada300c174b65273810abb4e326"
        },
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          "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": {
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    "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"
  },
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-27T11:52:42+00:00",
      "cve": "CVE-2026-80563",
      "id": "CVE-2026-80563",
      "initial_release_date": "2026-08-26T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: gpio: sloppy-logic-analyzer: fix use-after-free via debugfs trigger on unbind",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80563.json",
      "version": "3"
    },
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      "current_release_date": "2026-08-28T16:37:43Z",
      "cve": "CVE-2026-80563",
      "id": "CVE-2026-80563",
      "initial_release_date": "2026-08-27T00:11:50Z",
      "product_status:known_not_affected": "353",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80563",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80563.json",
      "version": "3"
    }
  }
}



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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.

Sightings

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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.