{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98859", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.376Z", "datePublished": "2026-10-18T15:51:20.456Z", "dateUpdated": "2026-10-21T12:57:37.465Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:57:37.465Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: multitouch: stop the release timer from being rearmed on remove\n\nmt_remove() quiesces the sticky-finger timer before stopping the\nhardware:\n\n timer_delete_sync(&td->release_timer);\n\n sysfs_remove_group(&hdev->dev.kobj, &mt_attribute_group);\n hid_hw_stop(hdev);\n\ntimer_delete_sync() waits for a running callback and dequeues the timer,\nbut it does not stop the timer from being armed again. The transport is\nstill delivering reports at that point, and the report path rearms it:\n\n if (app->quirks & MT_QUIRK_STICKY_FINGERS) {\n if (td->mt_io_flags & MT_IO_SLOTS_MASK)\n mod_timer(&td->release_timer,\n jiffies + msecs_to_jiffies(100));\n\nA report that arrives after timer_delete_sync() has returned therefore\nleaves the timer queued. td is allocated with devm_kzalloc() against\nhdev->dev, so it is freed when the driver is unbound, after mt_remove()\nreturns. When the timer fires afterwards, mt_expired_timeout()\ndereferences the freed td:\n\n struct mt_device *td = timer_container_of(td, t, release_timer);\n struct hid_device *hdev = td->hdev;\n\n if (test_and_set_bit_lock(MT_IO_FLAGS_RUNNING, &td->mt_io_flags))\n\nSimply moving the teardown after hid_hw_stop() does not fix this on its\nown, because mt_expired_timeout() calls mt_release_contacts(), which\nwalks hdev->inputs; the timer still has to be quiesced before\nhid_hw_stop() tears the input devices down.\n\nUse timer_shutdown_sync() instead, which additionally makes any later\nmod_timer() a no-op, so neither ordering constraint has to be traded off\nagainst the other. This is the final-teardown pattern the function was\nintroduced for, and hid-wiimote already uses it for the same reason."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/hid/hid-multitouch.c"], "versions": [{"version": "4f4001bc76fd1a138a501fbd3d68cce72cbf96ce", "lessThan": "3776f34fbce990af45978f1628d2e1adc0d67d0f", "status": "affected", "versionType": "git"}, {"version": "4f4001bc76fd1a138a501fbd3d68cce72cbf96ce", "lessThan": "1f1bd9a3117f082eb891c0986c4f0e04cd974c9a", "status": "affected", "versionType": "git"}, {"version": "4f4001bc76fd1a138a501fbd3d68cce72cbf96ce", "lessThan": "0c19a6c1d25fd5ed66d1f80dc6f6e56cc1f0a787", "status": "affected", "versionType": "git"}, {"version": "4f4001bc76fd1a138a501fbd3d68cce72cbf96ce", "lessThan": "a0125ca86e405b8a704e96157a6c10ca51087652", "status": "affected", "versionType": "git"}, {"version": "4f4001bc76fd1a138a501fbd3d68cce72cbf96ce", "lessThan": "5acb2dace582f061aab5e14c399ac9480315f44b", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/hid/hid-multitouch.c"], "versions": [{"version": "4.13", "status": "affected"}, {"version": "0", "lessThan": "4.13", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.113", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.56", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.10", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.13", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.13", "versionEndExcluding": "6.12.113"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.13", "versionEndExcluding": "6.18.56"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.13", "versionEndExcluding": "7.2.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.13", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/3776f34fbce990af45978f1628d2e1adc0d67d0f"}, {"url": "https://git.kernel.org/stable/c/1f1bd9a3117f082eb891c0986c4f0e04cd974c9a"}, {"url": "https://git.kernel.org/stable/c/0c19a6c1d25fd5ed66d1f80dc6f6e56cc1f0a787"}, {"url": "https://git.kernel.org/stable/c/a0125ca86e405b8a704e96157a6c10ca51087652"}, {"url": "https://git.kernel.org/stable/c/5acb2dace582f061aab5e14c399ac9480315f44b"}], "title": "HID: multitouch: stop the release timer from being rearmed on remove", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/hid/hid-multitouch.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "3776f34fbce990af45978f1628d2e1adc0d67d0f", "status": "affected", "version": "4f4001bc76fd1a138a501fbd3d68cce72cbf96ce", "versionType": "git"}, {"lessThan": "1f1bd9a3117f082eb891c0986c4f0e04cd974c9a", "status": "affected", "version": "4f4001bc76fd1a138a501fbd3d68cce72cbf96ce", "versionType": "git"}, {"lessThan": "0c19a6c1d25fd5ed66d1f80dc6f6e56cc1f0a787", "status": "affected", "version": "4f4001bc76fd1a138a501fbd3d68cce72cbf96ce", "versionType": "git"}, {"lessThan": "a0125ca86e405b8a704e96157a6c10ca51087652", "status": "affected", "version": "4f4001bc76fd1a138a501fbd3d68cce72cbf96ce", "versionType": "git"}, {"lessThan": "5acb2dace582f061aab5e14c399ac9480315f44b", "status": "affected", "version": "4f4001bc76fd1a138a501fbd3d68cce72cbf96ce", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/hid/hid-multitouch.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.13"}, {"lessThan": "4.13", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.113", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.56", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.10", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: multitouch: stop the release timer from being rearmed on remove\n\nmt_remove() quiesces the sticky-finger timer before stopping the\nhardware:\n\n timer_delete_sync(&td->release_timer);\n\n sysfs_remove_group(&hdev->dev.kobj, &mt_attribute_group);\n hid_hw_stop(hdev);\n\ntimer_delete_sync() waits for a running callback and dequeues the timer,\nbut it does not stop the timer from being armed again. The transport is\nstill delivering reports at that point, and the report path rearms it:\n\n if (app->quirks & MT_QUIRK_STICKY_FINGERS) {\n if (td->mt_io_flags & MT_IO_SLOTS_MASK)\n mod_timer(&td->release_timer,\n jiffies + msecs_to_jiffies(100));\n\nA report that arrives after timer_delete_sync() has returned therefore\nleaves the timer queued. td is allocated with devm_kzalloc() against\nhdev->dev, so it is freed when the driver is unbound, after mt_remove()\nreturns. When the timer fires afterwards, mt_expired_timeout()\ndereferences the freed td:\n\n struct mt_device *td = timer_container_of(td, t, release_timer);\n struct hid_device *hdev = td->hdev;\n\n if (test_and_set_bit_lock(MT_IO_FLAGS_RUNNING, &td->mt_io_flags))\n\nSimply moving the teardown after hid_hw_stop() does not fix this on its\nown, because mt_expired_timeout() calls mt_release_contacts(), which\nwalks hdev->inputs; the timer still has to be quiesced before\nhid_hw_stop() tears the input devices down.\n\nUse timer_shutdown_sync() instead, which additionally makes any later\nmod_timer() a no-op, so neither ordering constraint has to be traded off\nagainst the other. This is the final-teardown pattern the function was\nintroduced for, and hid-wiimote already uses it for the same reason."}], "id": "CVE-2026-98859", "lastModified": "2026-10-21T13:21:50.330", "metrics": {}, "published": "2026-10-18T16:17:40.363", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0c19a6c1d25fd5ed66d1f80dc6f6e56cc1f0a787"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1f1bd9a3117f082eb891c0986c4f0e04cd974c9a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3776f34fbce990af45978f1628d2e1adc0d67d0f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5acb2dace582f061aab5e14c399ac9480315f44b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a0125ca86e405b8a704e96157a6c10ca51087652"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: kernel: Denial of service via use-after-free in HID multitouch driver", "id": "2555254", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2555254"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nHID: multitouch: stop the release timer from being rearmed on remove\nmt_remove() quiesces the sticky-finger timer before stopping the\nhardware:\ntimer_delete_sync(&td->release_timer);\nsysfs_remove_group(&hdev->dev.kobj, &mt_attribute_group);\nhid_hw_stop(hdev);\ntimer_delete_sync() waits for a running callback and dequeues the timer,\nbut it does not stop the timer from being armed again. The transport is\nstill delivering reports at that point, and the report path rearms it:\nif (app->quirks & MT_QUIRK_STICKY_FINGERS) {\nif (td->mt_io_flags & MT_IO_SLOTS_MASK)\nmod_timer(&td->release_timer,\njiffies + msecs_to_jiffies(100));\nA report that arrives after timer_delete_sync() has returned therefore\nleaves the timer queued. td is allocated with devm_kzalloc() against\nhdev->dev, so it is freed when the driver is unbound, after mt_remove()\nreturns. When the timer fires afterwards, mt_expired_timeout()\ndereferences the freed td:\nstruct mt_device *td = timer_container_of(td, t, release_timer);\nstruct hid_device *hdev = td->hdev;\nif (test_and_set_bit_lock(MT_IO_FLAGS_RUNNING, &td->mt_io_flags))\nSimply moving the teardown after hid_hw_stop() does not fix this on its\nown, because mt_expired_timeout() calls mt_release_contacts(), which\nwalks hdev->inputs; the timer still has to be quiesced before\nhid_hw_stop() tears the input devices down.\nUse timer_shutdown_sync() instead, which additionally makes any later\nmod_timer() a no-op, so neither ordering constraint has to be traded off\nagainst the other. This is the final-teardown pattern the function was\nintroduced for, and hid-wiimote already uses it for the same reason.", "A flaw was found in the Linux kernel's Human Interface Device (HID) multitouch driver. When a multitouch device is disconnected or removed, the driver fails to prevent the release timer from being rescheduled by incoming input reports. Once the driver deallocates the device data, the timer callback executes and attempts to access the freed memory, resulting in a use-after-free condition. A local attacker could exploit this flaw to cause a Denial of Service (DoS) by crashing the system."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2026-98859", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}], "public_date": "2026-10-18T15:51:20Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98859\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98859\nhttps://git.kernel.org/stable/c/0c19a6c1d25fd5ed66d1f80dc6f6e56cc1f0a787\nhttps://git.kernel.org/stable/c/1f1bd9a3117f082eb891c0986c4f0e04cd974c9a\nhttps://git.kernel.org/stable/c/5acb2dace582f061aab5e14c399ac9480315f44b\nhttps://git.kernel.org/stable/c/a0125ca86e405b8a704e96157a6c10ca51087652\nhttps://kernelcve.org/list/?q=CVE-2026-98859"], "statement": "A race in the HID multitouch removal path can rearm release_timer after timer_delete_sync has already returned. The mt_device object is freed after mt_remove completes, but the queued timer can later execute mt_expired_timeout and dereference the released td object. The callback reads td hdev and performs a bit operation on td mt_io_flags, so the issue includes access to and modification of freed memory rather than only a harmless stale timer warning. For the CVSS the PR:N value reflects a malicious attached HID device that can deliver reports and disconnect without holding an account or privilege on the target. The paranoid AV:A interpretation is applicable only where an affected HID transport can be reached over an adjacent connection such as Bluetooth. Typical USB exploitation instead requires physical device access and the race has AC:H because a report must arrive during the narrow teardown window. The issue is not directly reachable over ordinary IP networks or the public Internet.", "threat_severity": "Moderate"}