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CVE-2026-80766 (GCVE-0-2026-80766)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:12 – Updated: 2026-09-04 15:12
VLAI
Title
HID: uclogic: fix use-after-free of inrange_timer on remove
Summary
In the Linux kernel, the following vulnerability has been resolved: HID: uclogic: fix use-after-free of inrange_timer on remove uclogic_remove() cancels the pen in-range timer and then stops the device: timer_delete_sync(&drvdata->inrange_timer); hid_hw_stop(hdev); timer_delete_sync() only guarantees the timer is idle at that instant. uclogic_raw_event_pen() keeps delivering pen reports until hid_hw_stop() stops the transport several lines later, and every report with pen->inrange == UCLOGIC_PARAMS_PEN_INRANGE_NONE re-arms the timer: mod_timer(&drvdata->inrange_timer, jiffies + msecs_to_jiffies(100)); A report landing between the timer_delete_sync() call and the transport teardown in hid_hw_stop() re-arms inrange_timer after it was cancelled. uclogic_remove() then returns and the devm drvdata is freed, while hid_hw_stop() has already freed the input device drvdata->pen_input points at, so when the timer fires ~100 ms later uclogic_inrange_timeout() dereferences freed memory -- a use-after-free in timer-softirq context. Swapping the two calls is not a fix: stopping the device first frees drvdata->pen_input via hidinput_disconnect() while the timer may still be pending, so a timer already armed before removal fires on the freed input device in the window before timer_delete_sync() runs. Use timer_shutdown_sync() before hid_hw_stop() instead. It cancels the timer, waits for a running callback while pen_input is still valid, and prevents any further re-arming -- a later mod_timer() from an in-flight report is silently ignored -- so the timer is provably dead before hid_hw_stop() frees the inputs. This is the ordering the timer core documents for this "timer re-armed from another path" teardown case.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 01309e29eb95c16bd48984f2589fad0cbf5e27d1 , < f40243358b407aec362fe305fabfcdc94a3abd89 (git)
Affected: 01309e29eb95c16bd48984f2589fad0cbf5e27d1 , < dc5108f18f58870a8dd4203a02a47e571a2be7f0 (git)
Affected: 01309e29eb95c16bd48984f2589fad0cbf5e27d1 , < 9d77ac82e57ead056cf3f71d347083ed9244ad90 (git)
Affected: 01309e29eb95c16bd48984f2589fad0cbf5e27d1 , < e750cdb6de009aace3c77f37fe2173f96175e8e4 (git)
Affected: 01309e29eb95c16bd48984f2589fad0cbf5e27d1 , < 849e537160bbb77fe419ecc3944bfe125dcd441b (git)
Affected: 01309e29eb95c16bd48984f2589fad0cbf5e27d1 , < f1b3ca06380531f49f988f4721d3ed30b0d7a5d2 (git)
Affected: 01309e29eb95c16bd48984f2589fad0cbf5e27d1 , < f13d0a00204b05e62336da0ab72ea0d87b56690c (git)
Affected: 01309e29eb95c16bd48984f2589fad0cbf5e27d1 , < 506fd50a9027340f0e9dcc587d10ccb03312dba6 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.1
Unaffected: 0 , < 5.1 (semver)
Unaffected: 5.15.220 , ≤ 5.15.* (semver)
Unaffected: 6.1.187 , ≤ 6.1.* (semver)
Unaffected: 6.6.156 , ≤ 6.6.* (semver)
Unaffected: 6.12.108 , ≤ 6.12.* (semver)
Unaffected: 6.18.47 , ≤ 6.18.* (semver)
Unaffected: 7.1.11 , ≤ 7.1.* (semver)
Unaffected: 7.2.1 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: uclogic: fix use-after-free of inrange_timer on remove\n\nuclogic_remove() cancels the pen in-range timer and then stops the\ndevice:\n\n\ttimer_delete_sync(\u0026drvdata-\u003einrange_timer);\n\thid_hw_stop(hdev);\n\ntimer_delete_sync() only guarantees the timer is idle at that instant.\nuclogic_raw_event_pen() keeps delivering pen reports until hid_hw_stop()\nstops the transport several lines later, and every report with\npen-\u003einrange == UCLOGIC_PARAMS_PEN_INRANGE_NONE re-arms the timer:\n\n\tmod_timer(\u0026drvdata-\u003einrange_timer, jiffies + msecs_to_jiffies(100));\n\nA report landing between the timer_delete_sync() call and the transport\nteardown in hid_hw_stop() re-arms inrange_timer after it was cancelled.\nuclogic_remove() then returns and the devm drvdata is freed, while\nhid_hw_stop() has already freed the input device drvdata-\u003epen_input\npoints at, so when the timer fires ~100 ms later\nuclogic_inrange_timeout() dereferences freed memory -- a use-after-free\nin timer-softirq context.\n\nSwapping the two calls is not a fix: stopping the device first frees\ndrvdata-\u003epen_input via hidinput_disconnect() while the timer may still\nbe pending, so a timer already armed before removal fires on the freed\ninput device in the window before timer_delete_sync() runs.\n\nUse timer_shutdown_sync() before hid_hw_stop() instead. It cancels the\ntimer, waits for a running callback while pen_input is still valid, and\nprevents any further re-arming -- a later mod_timer() from an in-flight\nreport is silently ignored -- so the timer is provably dead before\nhid_hw_stop() frees the inputs. This is the ordering the timer core\ndocuments for this \"timer re-armed from another path\" teardown case."
        }
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        {
          "url": "https://git.kernel.org/stable/c/506fd50a9027340f0e9dcc587d10ccb03312dba6"
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      "title": "HID: uclogic: fix use-after-free of inrange_timer on remove",
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        "descriptions": [
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: uclogic: fix use-after-free of inrange_timer on remove\n\nuclogic_remove() cancels the pen in-range timer and then stops the\ndevice:\n\n\ttimer_delete_sync(\u0026drvdata-\u003einrange_timer);\n\thid_hw_stop(hdev);\n\ntimer_delete_sync() only guarantees the timer is idle at that instant.\nuclogic_raw_event_pen() keeps delivering pen reports until hid_hw_stop()\nstops the transport several lines later, and every report with\npen-\u003einrange == UCLOGIC_PARAMS_PEN_INRANGE_NONE re-arms the timer:\n\n\tmod_timer(\u0026drvdata-\u003einrange_timer, jiffies + msecs_to_jiffies(100));\n\nA report landing between the timer_delete_sync() call and the transport\nteardown in hid_hw_stop() re-arms inrange_timer after it was cancelled.\nuclogic_remove() then returns and the devm drvdata is freed, while\nhid_hw_stop() has already freed the input device drvdata-\u003epen_input\npoints at, so when the timer fires ~100 ms later\nuclogic_inrange_timeout() dereferences freed memory -- a use-after-free\nin timer-softirq context.\n\nSwapping the two calls is not a fix: stopping the device first frees\ndrvdata-\u003epen_input via hidinput_disconnect() while the timer may still\nbe pending, so a timer already armed before removal fires on the freed\ninput device in the window before timer_delete_sync() runs.\n\nUse timer_shutdown_sync() before hid_hw_stop() instead. It cancels the\ntimer, waits for a running callback while pen_input is still valid, and\nprevents any further re-arming -- a later mod_timer() from an in-flight\nreport is silently ignored -- so the timer is provably dead before\nhid_hw_stop() frees the inputs. This is the ordering the timer core\ndocuments for this \"timer re-armed from another path\" teardown case."
          }
        ],
        "id": "CVE-2026-80766",
        "lastModified": "2026-09-04T16:18:01.923",
        "metrics": {},
        "published": "2026-09-04T16:18:01.923",
        "references": [
          {
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          },
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            "url": "https://git.kernel.org/stable/c/9d77ac82e57ead056cf3f71d347083ed9244ad90"
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            "url": "https://git.kernel.org/stable/c/f40243358b407aec362fe305fabfcdc94a3abd89"
          }
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:08:57Z",
      "cve": "CVE-2026-80766",
      "id": "CVE-2026-80766",
      "initial_release_date": "2026-09-07T16:20:04Z",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "93",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80766",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80766.json",
      "version": "4"
    }
  }
}



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Tags
Taxonomy of the tags.





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

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.


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.