Vulnerability-Lookup

CVE-2026-64365 (GCVE-0-2026-64365)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-07-25 08:50

Title

HID: letsketch: fix UAF on inrange_timer at driver unbind

Summary

In the Linux kernel, the following vulnerability has been resolved: HID: letsketch: fix UAF on inrange_timer at driver unbind letsketch_driver does not provide a .remove callback, but letsketch_probe() arms a per-device timer: timer_setup(&data->inrange_timer, letsketch_inrange_timeout, 0); The timer is re-armed from letsketch_raw_event() with a 100 ms timeout on every pen-in-range report, and its callback dereferences data->input_tablet to deliver a synthetic BTN_TOOL_PEN release. letsketch_data is allocated with devm_kzalloc(), and its input_dev fields are devm-allocated via letsketch_setup_input_tablet(). On device unbind (USB unplug or rmmod), the HID core runs its default teardown and devm cleanup frees both letsketch_data and the input devices. Because no .remove callback exists, nothing drains the timer first: if raw_event armed it within ~100 ms of the unbind, the pending timer fires on freed memory. This is a UAF read of data and of data->input_tablet, followed by input_report_key() / input_sync() into the freed input_dev. The same problem can occur on the probe error path: if hid_hw_start() enabled I/O on an always-poll-quirk device and then failed, raw_event may have armed the timer before devm releases data. Fix by adding a .remove callback that calls hid_hw_stop() first. hid_hw_stop() synchronously kills the URBs that deliver raw_event(), so once it returns no path can re-arm the timer. timer_shutdown_sync() then drains any in-flight callback and permanently disables further mod_timer() calls. Apply the same timer_shutdown_sync() in the probe error path so the timer is guaranteed not to outlive data.

Severity

No CVSS data available.

Assigner

Linux

References

6 references

URL	Tags
https://git.kernel.org/stable/c/2bb6e7143cf70ed28…
https://git.kernel.org/stable/c/523db788c0f846127…
https://git.kernel.org/stable/c/17f5928d7010bc9e0…
https://git.kernel.org/stable/c/3eca1a8165b5e7996…
https://git.kernel.org/stable/c/df3d8aa1a9392da3d…
https://git.kernel.org/stable/c/46c8beeccd8ab2c86…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 33a5c2793451770cb6dcf0cc35c76cfd4b045513 , < 2bb6e7143cf70ed281822d26c1848b2897ac36e9 (git) Affected: 33a5c2793451770cb6dcf0cc35c76cfd4b045513 , < 523db788c0f84612707638e266e8957ca7e3a756 (git) Affected: 33a5c2793451770cb6dcf0cc35c76cfd4b045513 , < 17f5928d7010bc9e002930326b59e60e40c09ee3 (git) Affected: 33a5c2793451770cb6dcf0cc35c76cfd4b045513 , < 3eca1a8165b5e7996e699e9df76cb4645e184d42 (git) Affected: 33a5c2793451770cb6dcf0cc35c76cfd4b045513 , < df3d8aa1a9392da3de66398e7a03422463806b21 (git) Affected: 33a5c2793451770cb6dcf0cc35c76cfd4b045513 , < 46c8beeccd8ab2c863827254a85ea877654a3534 (git)
Linux	Linux	Affected: 5.17 Unaffected: 0 , < 5.17 (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc3 , ≤ * (original_commit_for_fix)

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        }
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    "datePublished": "2026-07-25T08:50:20.039Z",
    "dateReserved": "2026-07-19T15:36:31.783Z",
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On\\ndevice unbind (USB unplug or rmmod), the HID core runs its default\\nteardown and devm cleanup frees both letsketch_data and the input\\ndevices.  Because no .remove callback exists, nothing drains the\\ntimer first: if raw_event armed it within ~100 ms of the unbind,\\nthe pending timer fires on freed memory.  This is a UAF read of\\ndata and of data-\u003einput_tablet, followed by input_report_key() /\\ninput_sync() into the freed input_dev.\\n\\nThe same problem can occur on the probe error path: if\\nhid_hw_start() enabled I/O on an always-poll-quirk device and then\\nfailed, raw_event may have armed the timer before devm releases\\ndata.\\n\\nFix by adding a .remove callback that calls hid_hw_stop() first.\\nhid_hw_stop() synchronously kills the URBs that deliver raw_event(),\\nso once it returns no path can re-arm the timer.  timer_shutdown_sync()\\nthen drains any in-flight callback and permanently disables further\\nmod_timer() calls.  Apply the same timer_shutdown_sync() in the probe\\nerror path so the timer is guaranteed not to outlive data.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/hid/hid-letsketch.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"33a5c2793451770cb6dcf0cc35c76cfd4b045513\",\"lessThan\":\"2bb6e7143cf70ed281822d26c1848b2897ac36e9\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"33a5c2793451770cb6dcf0cc35c76cfd4b045513\",\"lessThan\":\"523db788c0f84612707638e266e8957ca7e3a756\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"33a5c2793451770cb6dcf0cc35c76cfd4b045513\",\"lessThan\":\"17f5928d7010bc9e002930326b59e60e40c09ee3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"33a5c2793451770cb6dcf0cc35c76cfd4b045513\",\"lessThan\":\"3eca1a8165b5e7996e699e9df76cb4645e184d42\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"33a5c2793451770cb6dcf0cc35c76cfd4b045513\",\"lessThan\":\"df3d8aa1a9392da3de66398e7a03422463806b21\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"33a5c2793451770cb6dcf0cc35c76cfd4b045513\",\"lessThan\":\"46c8beeccd8ab2c863827254a85ea877654a3534\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/hid/hid-letsketch.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.17\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.17\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.96\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc3\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/17f5928d7010bc9e002930326b59e60e40c09ee3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2bb6e7143cf70ed281822d26c1848b2897ac36e9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3eca1a8165b5e7996e699e9df76cb4645e184d42\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/46c8beeccd8ab2c863827254a85ea877654a3534\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/523db788c0f84612707638e266e8957ca7e3a756\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/df3d8aa1a9392da3de66398e7a03422463806b21\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
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      "current_release_date": "2026-07-25T16:00:54Z",
      "cve": "CVE-2026-64365",
      "id": "CVE-2026-64365",
      "initial_release_date": "2026-07-25T16:00:54Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64365",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64365.json",
      "version": "2"
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}

GHSA-8QPM-Q6PR-QXF8

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

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

HID: letsketch: fix UAF on inrange_timer at driver unbind

letsketch_driver does not provide a .remove callback, but letsketch_probe() arms a per-device timer:

timer_setup(&data->inrange_timer, letsketch_inrange_timeout, 0);

The timer is re-armed from letsketch_raw_event() with a 100 ms timeout on every pen-in-range report, and its callback dereferences data->input_tablet to deliver a synthetic BTN_TOOL_PEN release.

letsketch_data is allocated with devm_kzalloc(), and its input_dev fields are devm-allocated via letsketch_setup_input_tablet(). On device unbind (USB unplug or rmmod), the HID core runs its default teardown and devm cleanup frees both letsketch_data and the input devices. Because no .remove callback exists, nothing drains the timer first: if raw_event armed it within ~100 ms of the unbind, the pending timer fires on freed memory. This is a UAF read of data and of data->input_tablet, followed by input_report_key() / input_sync() into the freed input_dev.

The same problem can occur on the probe error path: if hid_hw_start() enabled I/O on an always-poll-quirk device and then failed, raw_event may have armed the timer before devm releases data.

Fix by adding a .remove callback that calls hid_hw_stop() first. hid_hw_stop() synchronously kills the URBs that deliver raw_event(), so once it returns no path can re-arm the timer. timer_shutdown_sync() then drains any in-flight callback and permanently disables further mod_timer() calls. Apply the same timer_shutdown_sync() in the probe error path so the timer is guaranteed not to outlive data.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-64365"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:19Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: letsketch: fix UAF on inrange_timer at driver unbind\n\nletsketch_driver does not provide a .remove callback, but\nletsketch_probe() arms a per-device timer:\n\n    timer_setup(\u0026data-\u003einrange_timer, letsketch_inrange_timeout, 0);\n\nThe timer is re-armed from letsketch_raw_event() with a 100 ms\ntimeout on every pen-in-range report, and its callback dereferences\ndata-\u003einput_tablet to deliver a synthetic BTN_TOOL_PEN release.\n\nletsketch_data is allocated with devm_kzalloc(), and its input_dev\nfields are devm-allocated via letsketch_setup_input_tablet().  On\ndevice unbind (USB unplug or rmmod), the HID core runs its default\nteardown and devm cleanup frees both letsketch_data and the input\ndevices.  Because no .remove callback exists, nothing drains the\ntimer first: if raw_event armed it within ~100 ms of the unbind,\nthe pending timer fires on freed memory.  This is a UAF read of\ndata and of data-\u003einput_tablet, followed by input_report_key() /\ninput_sync() into the freed input_dev.\n\nThe same problem can occur on the probe error path: if\nhid_hw_start() enabled I/O on an always-poll-quirk device and then\nfailed, raw_event may have armed the timer before devm releases\ndata.\n\nFix by adding a .remove callback that calls hid_hw_stop() first.\nhid_hw_stop() synchronously kills the URBs that deliver raw_event(),\nso once it returns no path can re-arm the timer.  timer_shutdown_sync()\nthen drains any in-flight callback and permanently disables further\nmod_timer() calls.  Apply the same timer_shutdown_sync() in the probe\nerror path so the timer is guaranteed not to outlive data.",
  "id": "GHSA-8qpm-q6pr-qxf8",
  "modified": "2026-07-25T12:31:33Z",
  "published": "2026-07-25T12:31:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64365"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/17f5928d7010bc9e002930326b59e60e40c09ee3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2bb6e7143cf70ed281822d26c1848b2897ac36e9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3eca1a8165b5e7996e699e9df76cb4645e184d42"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/46c8beeccd8ab2c863827254a85ea877654a3534"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/523db788c0f84612707638e266e8957ca7e3a756"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/df3d8aa1a9392da3de66398e7a03422463806b21"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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.

Action not permitted

CVE-2026-64365 (GCVE-0-2026-64365)

GHSA-8QPM-Q6PR-QXF8

Tags

Sightings

Nomenclature