{"api_version":"1","generated_at":"2026-04-22T20:06:58+00:00","cve":"CVE-2021-33656","urls":{"html":"https://cve.report/CVE-2021-33656","api":"https://cve.report/api/cve/CVE-2021-33656.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-33656","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-33656"},"summary":{"title":"CVE-2021-33656","description":"When setting font with malicous data by ioctl cmd PIO_FONT,kernel will write memory out of bounds.","state":"PUBLIC","assigner":"securities@openeuler.org","published_at":"2022-07-18 15:15:00","updated_at":"2022-10-29 02:52:00"},"problem_types":["CWE-787"],"metrics":[],"references":[{"url":"http://www.openwall.com/lists/oss-security/2022/07/19/3","name":"[oss-security] 20220719 CVE-2021-33656: Linux kernel: When setting font with malicous data by ioctl cmd PIO_FONT,kernel will write memory out of bounds.(<5.10.127)","refsource":"MLIST","tags":[],"title":"oss-security - CVE-2021-33656: Linux kernel: When setting font with malicous data by ioctl cmd\n PIO_FONT,kernel will write memory out of bounds.(<5.10.127)","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html","name":"[debian-lts-announce] 20221002 [SECURITY] [DLA 3131-1] linux security update","refsource":"MLIST","tags":[],"title":"[SECURITY] [DLA 3131-1] linux security update","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.openeuler.org/en/security/cve/detail.html?id=CVE-2021-33656&packageName=kernel","name":"https://www.openeuler.org/en/security/cve/detail.html?id=CVE-2021-33656&packageName=kernel","refsource":"MISC","tags":[],"title":"Security-cveDetail","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/releases/5.10.127/vt-drop-old-font-ioctls.patch","name":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/releases/5.10.127/vt-drop-old-font-ioctls.patch","refsource":"MISC","tags":[],"title":"vt-drop-old-font-ioctls.patch « 5.10.127 « releases - kernel/git/stable/stable-queue.git - Linux kernel stable patch queue","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-33656","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-33656","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2021","cve_id":"33656","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"debian","cpe5":"debian_linux","cpe6":"10.0","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"33656","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"huawei","cpe5":"openeuler","cpe6":"20.03","cpe7":"-","cpe8":"*","cpe9":"*","cpe10":"lts","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"33656","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"huawei","cpe5":"openeuler","cpe6":"20.03","cpe7":"sp1","cpe8":"*","cpe9":"*","cpe10":"lts","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"33656","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"huawei","cpe5":"openeuler","cpe6":"20.03","cpe7":"sp3","cpe8":"*","cpe9":"*","cpe10":"lts","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"33656","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"linux","cpe5":"linux_kernel","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[{"cve":"CVE-2021-33656","qid":"160076","title":"Oracle Enterprise Linux Security Update for unbreakable enterprise kernel (ELSA-2022-9761)"},{"cve":"CVE-2021-33656","qid":"160692","title":"Oracle Enterprise Linux Security Update for kernel (ELSA-2023-2951)"},{"cve":"CVE-2021-33656","qid":"180908","title":"Debian Security Update for linux (CVE-2021-33656)"},{"cve":"CVE-2021-33656","qid":"181091","title":"Debian Security Update for linux (DLA 3131-1)"},{"cve":"CVE-2021-33656","qid":"198917","title":"Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-5589-1)"},{"cve":"CVE-2021-33656","qid":"198919","title":"Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-5592-1)"},{"cve":"CVE-2021-33656","qid":"198920","title":"Ubuntu Security Notification for Linux kernel Vulnerability (USN-5591-3)"},{"cve":"CVE-2021-33656","qid":"198922","title":"Ubuntu Security Notification for Linux kernel (AWS) Vulnerability (USN-5591-4)"},{"cve":"CVE-2021-33656","qid":"198924","title":"Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-5595-1)"},{"cve":"CVE-2021-33656","qid":"198925","title":"Ubuntu Security Notification for Linux kernel (Oracle) Vulnerability (USN-5598-1)"},{"cve":"CVE-2021-33656","qid":"198926","title":"Ubuntu Security Notification for Linux kernel (HWE) Vulnerabilities (USN-5600-1)"},{"cve":"CVE-2021-33656","qid":"198928","title":"Ubuntu Security Notification for Linux kernel (Raspberry Pi) Vulnerabilities (USN-5603-1)"},{"cve":"CVE-2021-33656","qid":"198930","title":"Ubuntu Security Notification for Linux kernel (Azure CVM) Vulnerabilities (USN-5605-1)"},{"cve":"CVE-2021-33656","qid":"241504","title":"Red Hat Update for kernel security (RHSA-2023:2951)"},{"cve":"CVE-2021-33656","qid":"241527","title":"Red Hat Update for kernel-rt (RHSA-2023:2736)"},{"cve":"CVE-2021-33656","qid":"377117","title":"Alibaba Cloud Linux Security Update for cloud-kernel (ALINUX3-SA-2022:0158)"},{"cve":"CVE-2021-33656","qid":"377766","title":"Alibaba Cloud Linux Security Update for cloud-kernel (ALINUX2-SA-2022:0049)"},{"cve":"CVE-2021-33656","qid":"377871","title":"Alibaba Cloud Linux Security Update for cloud-kernel (ALINUX2-SA-2023:0001)"},{"cve":"CVE-2021-33656","qid":"390267","title":"Oracle VM Server for x86 Security Update for kernel (OVMSA-2022-0024)"},{"cve":"CVE-2021-33656","qid":"672086","title":"EulerOS Security Update for kernel (EulerOS-SA-2022-2321)"},{"cve":"CVE-2021-33656","qid":"672114","title":"EulerOS Security Update for kernel (EulerOS-SA-2022-2292)"},{"cve":"CVE-2021-33656","qid":"672139","title":"EulerOS Security Update for kernel (EulerOS-SA-2022-2428)"},{"cve":"CVE-2021-33656","qid":"672141","title":"EulerOS Security Update for kernel (EulerOS-SA-2022-2441)"},{"cve":"CVE-2021-33656","qid":"672158","title":"EulerOS Security Update for kernel (EulerOS-SA-2022-2415)"},{"cve":"CVE-2021-33656","qid":"672205","title":"EulerOS Security Update for kernel (EulerOS-SA-2022-2466)"},{"cve":"CVE-2021-33656","qid":"752452","title":"SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2022:2719-1)"},{"cve":"CVE-2021-33656","qid":"752453","title":"SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2022:2723-1)"},{"cve":"CVE-2021-33656","qid":"752455","title":"SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2022:2720-1)"},{"cve":"CVE-2021-33656","qid":"752463","title":"SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2022:2809-1)"},{"cve":"CVE-2021-33656","qid":"752464","title":"SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2022:2808-1)"},{"cve":"CVE-2021-33656","qid":"752474","title":"SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2022:2827-1)"},{"cve":"CVE-2021-33656","qid":"752502","title":"SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2022:2875-1)"},{"cve":"CVE-2021-33656","qid":"753156","title":"SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2022:2741-1)"},{"cve":"CVE-2021-33656","qid":"753316","title":"SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2022:2892-1)"},{"cve":"CVE-2021-33656","qid":"753703","title":"SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2023:0416-1)"},{"cve":"CVE-2021-33656","qid":"753707","title":"SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2023:0416-1)"},{"cve":"CVE-2021-33656","qid":"753727","title":"SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2023:0416-1)"},{"cve":"CVE-2021-33656","qid":"902574","title":"Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (10370)"},{"cve":"CVE-2021-33656","qid":"902699","title":"Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (10370-1)"},{"cve":"CVE-2021-33656","qid":"941096","title":"AlmaLinux Security Update for kernel (ALSA-2023:2951)"},{"cve":"CVE-2021-33656","qid":"941114","title":"AlmaLinux Security Update for kernel-rt (ALSA-2023:2736)"}]},"source_records":{"cve_program":{"data_type":"CVE","data_format":"MITRE","data_version":"4.0","CVE_data_meta":{"ID":"CVE-2021-33656","ASSIGNER":"securities@openeuler.org","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"vendor_name":"n/a","product":{"product_data":[{"product_name":"openEuler:kernel","version":{"version_data":[{"version_value":"<5.10.127"}]}}]}}]}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-787 Out-of-bounds Write"}]}]},"references":{"reference_data":[{"refsource":"MISC","name":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/releases/5.10.127/vt-drop-old-font-ioctls.patch","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/releases/5.10.127/vt-drop-old-font-ioctls.patch"},{"refsource":"MISC","name":"https://www.openeuler.org/en/security/cve/detail.html?id=CVE-2021-33656&packageName=kernel","url":"https://www.openeuler.org/en/security/cve/detail.html?id=CVE-2021-33656&packageName=kernel"},{"refsource":"MLIST","name":"[oss-security] 20220719 CVE-2021-33656: Linux kernel: When setting font with malicous data by ioctl cmd PIO_FONT,kernel will write memory out of bounds.(<5.10.127)","url":"http://www.openwall.com/lists/oss-security/2022/07/19/3"},{"refsource":"MLIST","name":"[debian-lts-announce] 20221002 [SECURITY] [DLA 3131-1] linux security update","url":"https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html"}]},"description":{"description_data":[{"lang":"eng","value":"When setting font with malicous data by ioctl cmd PIO_FONT,kernel will write memory out of bounds."}]}},"nvd":{"publishedDate":"2022-07-18 15:15:00","lastModifiedDate":"2022-10-29 02:52:00","problem_types":["CWE-787"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","attackVector":"PHYSICAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseScore":6.8,"baseSeverity":"MEDIUM"},"exploitabilityScore":0.9,"impactScore":5.9}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:huawei:openeuler:20.03:sp3:*:*:lts:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:huawei:openeuler:20.03:sp1:*:*:lts:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:huawei:openeuler:20.03:-:*:*:lts:*:*:*","cpe_name":[]}]},{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.127","cpe_name":[]}]},{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"33656","Ordinal":"209067","Title":"CVE-2021-33656","CVE":"CVE-2021-33656","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"33656","Ordinal":"1","NoteData":"** RESERVED ** This candidate has been reserved by an organization or individual that will use it when announcing a new security problem. When the candidate has been publicized, the details for this candidate will be provided.","Type":"Description","Title":null}]}}}