WID-SEC-W-2022-1651
Vulnerability from csaf_certbund - Published: 2022-10-09 22:00 - Updated: 2023-07-17 22:00Summary
Linux Kernel: Schwachstelle ermöglicht nicht spezifizierten Angriff
Severity
Mittel
Notes
Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.
Produktbeschreibung: Der Kernel stellt den Kern des Linux Betriebssystems dar.
Angriff: Ein lokaler Angreifer kann eine Schwachstelle im Linux Kernel ausnutzen, um einen nicht näher spezifizierten Angriff durchzuführen.
Betroffene Betriebssysteme: - Linux
Es existiert eine Schwachstelle im Linux Kernel. Diese ist auf einen Use-after-Free-Fehler zurückzuführen. Ein Angreifer kann diese Schwachstelle ausnutzen, um nicht näher spezifizierte Auswirkungen zu verursachen.
Affected products
Known affected
6 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
IBM QRadar SIEM 7.5
IBM
|
cpe:/a:ibm:qradar_siem:7.5
|
— | |
|
SUSE Linux
SUSE
|
cpe:/o:suse:suse_linux:-
|
— | |
|
Red Hat Enterprise Linux
Red Hat
|
cpe:/o:redhat:enterprise_linux:-
|
— | |
|
Ubuntu Linux
Ubuntu
|
cpe:/o:canonical:ubuntu_linux:-
|
— | |
|
Open Source CentOS
Open Source
|
cpe:/o:centos:centos:-
|
— | |
|
Oracle Linux
Oracle
|
cpe:/o:oracle:linux:-
|
— |
References
60 references
{
"document": {
"aggregate_severity": {
"text": "mittel"
},
"category": "csaf_base",
"csaf_version": "2.0",
"distribution": {
"tlp": {
"label": "WHITE",
"url": "https://www.first.org/tlp/"
}
},
"lang": "de-DE",
"notes": [
{
"category": "legal_disclaimer",
"text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
},
{
"category": "description",
"text": "Der Kernel stellt den Kern des Linux Betriebssystems dar.",
"title": "Produktbeschreibung"
},
{
"category": "summary",
"text": "Ein lokaler Angreifer kann eine Schwachstelle im Linux Kernel ausnutzen, um einen nicht n\u00e4her spezifizierten Angriff durchzuf\u00fchren.",
"title": "Angriff"
},
{
"category": "general",
"text": "- Linux",
"title": "Betroffene Betriebssysteme"
}
],
"publisher": {
"category": "other",
"contact_details": "csaf-provider@cert-bund.de",
"name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
"namespace": "https://www.bsi.bund.de"
},
"references": [
{
"category": "self",
"summary": "WID-SEC-W-2022-1651 - CSAF Version",
"url": "https://wid.cert-bund.de/.well-known/csaf/white/2022/wid-sec-w-2022-1651.json"
},
{
"category": "self",
"summary": "WID-SEC-2022-1651 - Portal Version",
"url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2022-1651"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2023:4138 vom 2023-07-18",
"url": "https://access.redhat.com/errata/RHSA-2023:4138"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2023:4137 vom 2023-07-18",
"url": "https://access.redhat.com/errata/RHSA-2023:4137"
},
{
"category": "external",
"summary": "IBM Security Bulletin 7010099 vom 2023-07-06",
"url": "https://www.ibm.com/support/pages/node/7010099"
},
{
"category": "external",
"summary": "Oracle Linux Security Advisory ELSA-2023-2458 vom 2023-06-28",
"url": "https://oss.oracle.com/pipermail/el-errata/2023-June/014226.html"
},
{
"category": "external",
"summary": "Oracle Linux Security Advisory ELSA-2023-2951 vom 2023-06-14",
"url": "https://oss.oracle.com/pipermail/el-errata/2023-June/014107.html"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2023:3388 vom 2023-05-31",
"url": "https://access.redhat.com/errata/RHSA-2023:3388"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2023:2736 vom 2023-05-16",
"url": "https://access.redhat.com/errata/RHSA-2023:2736"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2023:2951 vom 2023-05-16",
"url": "https://access.redhat.com/errata/RHSA-2023:2951"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2023:2148 vom 2023-05-09",
"url": "https://access.redhat.com/errata/RHSA-2023:2148"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2023:2458 vom 2023-05-09",
"url": "https://access.redhat.com/errata/RHSA-2023:2458"
},
{
"category": "external",
"summary": "Oracle Linux Security Advisory ELSA-2023-1091 vom 2023-03-08",
"url": "http://linux.oracle.com/errata/ELSA-2023-1091.html"
},
{
"category": "external",
"summary": "CentOS Security Advisory CESA-2023:1091 vom 2023-03-08",
"url": "https://lists.centos.org/pipermail/centos-announce/2023-March/086390.html"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2023:1092 vom 2023-03-07",
"url": "https://access.redhat.com/errata/RHSA-2023:1092"
},
{
"category": "external",
"summary": "Red Hat Security Advisory RHSA-2023:1091 vom 2023-03-07",
"url": "https://access.redhat.com/errata/RHSA-2023:1091"
},
{
"category": "external",
"summary": "Ubuntu Security Notice USN-5916-1 vom 2023-03-03",
"url": "https://ubuntu.com/security/notices/USN-5916-1"
},
{
"category": "external",
"summary": "NIST Database vom 2022-10-09",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-42703"
},
{
"category": "external",
"summary": "Linux Kernel Changelog vom 2022-10-09",
"url": "https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.19.7"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2022:3897-1 vom 2022-11-08",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2022-November/012838.html"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2022:3929-1 vom 2022-11-10",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2022-November/012867.html"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2022:3998-1 vom 2022-11-15",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2022-November/012930.html"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2022:4030-1 vom 2022-11-17",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2022-November/012950.html"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2022:4033-1 vom 2022-11-17",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2022-November/012953.html"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2022:4027-1 vom 2022-11-17",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2022-November/012949.html"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2022:4039-1 vom 2022-11-17",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2022-November/012951.html"
},
{
"category": "external",
"summary": "Ubuntu Security Notice USN-5728-1 vom 2022-11-17",
"url": "https://ubuntu.com/security/notices/USN-5728-1"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2022:4024-1 vom 2022-11-17",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2022-November/012957.html"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2022:4034-1 vom 2022-11-17",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2022-November/012952.html"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2022:4035-1 vom 2022-11-17",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2022-November/012954.html"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2022:4053-1 vom 2022-11-17",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2022-November/012967.html"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2022:4072-1 vom 2022-11-18",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2022-November/012989.html"
},
{
"category": "external",
"summary": "Ubuntu Security Notice USN-5729-2 vom 2022-11-18",
"url": "https://ubuntu.com/security/notices/USN-5728-2"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2022:4100-1 vom 2022-11-18",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2022-November/012994.html"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2022:4113-1 vom 2022-11-18",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2022-November/013000.html"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2022:4112-1 vom 2022-11-19",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2022-November/013002.html"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2022:4129-1 vom 2022-11-19",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2022-November/013003.html"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2022:4272-1 vom 2022-11-29",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2022-November/013140.html"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2022:4273-1 vom 2022-11-29",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2022-November/013142.html"
},
{
"category": "external",
"summary": "Ubuntu Security Notice USN-5728-3 vom 2022-11-29",
"url": "https://ubuntu.com/security/notices/USN-5728-3"
},
{
"category": "external",
"summary": "Ubuntu Security Notice USN-5756-1 vom 2022-12-01",
"url": "https://ubuntu.com/security/notices/USN-5756-1"
},
{
"category": "external",
"summary": "Ubuntu Security Notice USN-5757-1 vom 2022-12-01",
"url": "https://ubuntu.com/security/notices/USN-5757-1"
},
{
"category": "external",
"summary": "Ubuntu Security Notice USN-5757-2 vom 2022-12-01",
"url": "https://ubuntu.com/security/notices/USN-5757-2"
},
{
"category": "external",
"summary": "Ubuntu Security Notice USN-5758-1 vom 2022-12-01",
"url": "https://ubuntu.com/security/notices/USN-5758-1"
},
{
"category": "external",
"summary": "Ubuntu Security Notice USN-5755-1 vom 2022-12-01",
"url": "https://ubuntu.com/security/notices/USN-5755-1"
},
{
"category": "external",
"summary": "Ubuntu Security Notice USN-5728-2 vom 2022-12-02",
"url": "https://ubuntu.com/security/notices/USN-5755-2"
},
{
"category": "external",
"summary": "Ubuntu Security Notice USN-5756-2 vom 2022-12-02",
"url": "https://ubuntu.com/security/notices/USN-5756-2"
},
{
"category": "external",
"summary": "Ubuntu Security Notice USN-5756-3 vom 2022-12-12",
"url": "https://ubuntu.com/security/notices/USN-5756-3"
},
{
"category": "external",
"summary": "Ubuntu Security Notice USN-5774-1 vom 2022-12-12",
"url": "https://ubuntu.com/security/notices/USN-5774-1"
},
{
"category": "external",
"summary": "Ubuntu Security Notice USN-5773-1 vom 2022-12-12",
"url": "https://ubuntu.com/security/notices/USN-5773-1"
},
{
"category": "external",
"summary": "Ubuntu Security Notice USN-5779-1 vom 2022-12-14",
"url": "https://ubuntu.com/security/notices/USN-5779-1"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2022:4573-1 vom 2022-12-19",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2022-December/013280.html"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2022:4561-1 vom 2022-12-19",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2022-December/013272.html"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2022:4574-1 vom 2022-12-19",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2022-December/013279.html"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2022:4589-1 vom 2022-12-20",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2022-December/013294.html"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2022:4617-1 vom 2022-12-23",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2022-December/013342.html"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2022:4614-1 vom 2022-12-23",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2022-December/013337.html"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2022:4611-1 vom 2022-12-23",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2022-December/013341.html"
},
{
"category": "external",
"summary": "SUSE Security Update SUSE-SU-2022:4615-1 vom 2022-12-23",
"url": "https://lists.suse.com/pipermail/sle-security-updates/2022-December/013338.html"
},
{
"category": "external",
"summary": "Ubuntu Security Notice USN-5789-1 vom 2023-01-05",
"url": "https://ubuntu.com/security/notices/USN-5789-1"
}
],
"source_lang": "en-US",
"title": "Linux Kernel: Schwachstelle erm\u00f6glicht nicht spezifizierten Angriff",
"tracking": {
"current_release_date": "2023-07-17T22:00:00.000+00:00",
"generator": {
"date": "2024-08-15T17:36:12.876+00:00",
"engine": {
"name": "BSI-WID",
"version": "1.3.5"
}
},
"id": "WID-SEC-W-2022-1651",
"initial_release_date": "2022-10-09T22:00:00.000+00:00",
"revision_history": [
{
"date": "2022-10-09T22:00:00.000+00:00",
"number": "1",
"summary": "Initiale Fassung"
},
{
"date": "2022-11-08T23:00:00.000+00:00",
"number": "2",
"summary": "Neue Updates von SUSE aufgenommen"
},
{
"date": "2022-11-10T23:00:00.000+00:00",
"number": "3",
"summary": "Neue Updates von SUSE aufgenommen"
},
{
"date": "2022-11-15T23:00:00.000+00:00",
"number": "4",
"summary": "Neue Updates von SUSE aufgenommen"
},
{
"date": "2022-11-16T23:00:00.000+00:00",
"number": "5",
"summary": "Neue Updates von SUSE und Ubuntu aufgenommen"
},
{
"date": "2022-11-17T23:00:00.000+00:00",
"number": "6",
"summary": "Neue Updates von SUSE aufgenommen"
},
{
"date": "2022-11-20T23:00:00.000+00:00",
"number": "7",
"summary": "Neue Updates von SUSE und Ubuntu aufgenommen"
},
{
"date": "2022-11-29T23:00:00.000+00:00",
"number": "8",
"summary": "Neue Updates von SUSE und Ubuntu aufgenommen"
},
{
"date": "2022-12-01T23:00:00.000+00:00",
"number": "9",
"summary": "Neue Updates von Ubuntu aufgenommen"
},
{
"date": "2022-12-04T23:00:00.000+00:00",
"number": "10",
"summary": "Neue Updates von Ubuntu aufgenommen"
},
{
"date": "2022-12-12T23:00:00.000+00:00",
"number": "11",
"summary": "Neue Updates von Ubuntu aufgenommen"
},
{
"date": "2022-12-14T23:00:00.000+00:00",
"number": "12",
"summary": "Neue Updates von Ubuntu aufgenommen"
},
{
"date": "2022-12-19T23:00:00.000+00:00",
"number": "13",
"summary": "Neue Updates von SUSE aufgenommen"
},
{
"date": "2022-12-20T23:00:00.000+00:00",
"number": "14",
"summary": "Neue Updates von SUSE aufgenommen"
},
{
"date": "2022-12-26T23:00:00.000+00:00",
"number": "15",
"summary": "Neue Updates von SUSE aufgenommen"
},
{
"date": "2023-01-05T23:00:00.000+00:00",
"number": "16",
"summary": "Neue Updates von Ubuntu aufgenommen"
},
{
"date": "2023-03-02T23:00:00.000+00:00",
"number": "17",
"summary": "Neue Updates von Ubuntu aufgenommen"
},
{
"date": "2023-03-07T23:00:00.000+00:00",
"number": "18",
"summary": "Neue Updates von Red Hat aufgenommen"
},
{
"date": "2023-03-08T23:00:00.000+00:00",
"number": "19",
"summary": "Neue Updates von CentOS und Oracle Linux aufgenommen"
},
{
"date": "2023-05-09T22:00:00.000+00:00",
"number": "20",
"summary": "Neue Updates von Red Hat aufgenommen"
},
{
"date": "2023-05-16T22:00:00.000+00:00",
"number": "21",
"summary": "Neue Updates von Red Hat aufgenommen"
},
{
"date": "2023-05-31T22:00:00.000+00:00",
"number": "22",
"summary": "Neue Updates von Red Hat aufgenommen"
},
{
"date": "2023-06-13T22:00:00.000+00:00",
"number": "23",
"summary": "Neue Updates von Oracle Linux aufgenommen"
},
{
"date": "2023-06-28T22:00:00.000+00:00",
"number": "24",
"summary": "Neue Updates von Oracle Linux aufgenommen"
},
{
"date": "2023-07-06T22:00:00.000+00:00",
"number": "25",
"summary": "Neue Updates von IBM aufgenommen"
},
{
"date": "2023-07-17T22:00:00.000+00:00",
"number": "26",
"summary": "Neue Updates von Red Hat aufgenommen"
}
],
"status": "final",
"version": "26"
}
},
"product_tree": {
"branches": [
{
"branches": [
{
"category": "product_name",
"name": "IBM QRadar SIEM 7.5",
"product": {
"name": "IBM QRadar SIEM 7.5",
"product_id": "T022954",
"product_identification_helper": {
"cpe": "cpe:/a:ibm:qradar_siem:7.5"
}
}
}
],
"category": "vendor",
"name": "IBM"
},
{
"branches": [
{
"category": "product_name",
"name": "Open Source CentOS",
"product": {
"name": "Open Source CentOS",
"product_id": "1727",
"product_identification_helper": {
"cpe": "cpe:/o:centos:centos:-"
}
}
},
{
"category": "product_name",
"name": "Open Source Linux Kernel \u003c 5.19.7",
"product": {
"name": "Open Source Linux Kernel \u003c 5.19.7",
"product_id": "1233071",
"product_identification_helper": {
"cpe": "cpe:/o:linux:linux_kernel:5.19.7"
}
}
}
],
"category": "vendor",
"name": "Open Source"
},
{
"branches": [
{
"category": "product_name",
"name": "Oracle Linux",
"product": {
"name": "Oracle Linux",
"product_id": "T004914",
"product_identification_helper": {
"cpe": "cpe:/o:oracle:linux:-"
}
}
}
],
"category": "vendor",
"name": "Oracle"
},
{
"branches": [
{
"category": "product_name",
"name": "Red Hat Enterprise Linux",
"product": {
"name": "Red Hat Enterprise Linux",
"product_id": "67646",
"product_identification_helper": {
"cpe": "cpe:/o:redhat:enterprise_linux:-"
}
}
}
],
"category": "vendor",
"name": "Red Hat"
},
{
"branches": [
{
"category": "product_name",
"name": "SUSE Linux",
"product": {
"name": "SUSE Linux",
"product_id": "T002207",
"product_identification_helper": {
"cpe": "cpe:/o:suse:suse_linux:-"
}
}
}
],
"category": "vendor",
"name": "SUSE"
},
{
"branches": [
{
"category": "product_name",
"name": "Ubuntu Linux",
"product": {
"name": "Ubuntu Linux",
"product_id": "T000126",
"product_identification_helper": {
"cpe": "cpe:/o:canonical:ubuntu_linux:-"
}
}
}
],
"category": "vendor",
"name": "Ubuntu"
}
]
},
"vulnerabilities": [
{
"cve": "CVE-2022-42703",
"notes": [
{
"category": "description",
"text": "Es existiert eine Schwachstelle im Linux Kernel. Diese ist auf einen Use-after-Free-Fehler zur\u00fcckzuf\u00fchren. Ein Angreifer kann diese Schwachstelle ausnutzen, um nicht n\u00e4her spezifizierte Auswirkungen zu verursachen."
}
],
"product_status": {
"known_affected": [
"T022954",
"T002207",
"67646",
"T000126",
"1727",
"T004914"
]
},
"release_date": "2022-10-09T22:00:00.000+00:00",
"title": "CVE-2022-42703"
}
]
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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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.