CVE-2021-46920 - Vulnerability Details - OpenCVE

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

dmaengine: idxd: Fix clobbering of SWERR overflow bit on writeback

Current code blindly writes over the SWERR and the OVERFLOW bits. Write
back the bits actually read instead so the driver avoids clobbering the
OVERFLOW bit that comes after the register is read.

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00012.

Exploitation none

Automatable no

Technical Impact partial

Vendors	Products
Linux	Linux Kernel

Configuration 1 [-]

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::

No data.

No data.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References

Link	Providers
https://git.kernel.org/stable/c/02981a44a0e402089775416371bd2e0c935685f8
https://git.kernel.org/stable/c/a5ad12d5d69c63af289a37f05187a0c6fe93553d
https://git.kernel.org/stable/c/ea941ac294d75d0ace50797aebf0056f6f8f7a7f
https://nvd.nist.gov/vuln/detail/CVE-2021-46920
https://www.cve.org/CVERecord?id=CVE-2021-46920

History

No history.

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2024-02-27T06:53:57.372Z

Updated: 2025-05-04T07:00:22.682Z

Reserved: 2024-02-25T13:45:52.719Z

Link: CVE-2021-46920

Vulnrichment

Updated: 2024-08-04T05:17:42.983Z

NVD

Status : Modified

Published: 2024-02-27T07:15:08.987

Modified: 2024-11-21T06:34:56.077

Link: CVE-2021-46920

Redhat

Severity : Low

Publid Date: 2024-02-27T00:00:00Z

Links: CVE-2021-46920 - Bugzilla

OpenCVE Enrichment

No data.

{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"cveId": "CVE-2021-46920", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-25T13:45:52.719Z", "datePublished": "2024-02-27T06:53:57.372Z", "dateUpdated": "2025-05-04T07:00:22.682Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-05-04T07:00:22.682Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: idxd: Fix clobbering of SWERR overflow bit on writeback\n\nCurrent code blindly writes over the SWERR and the OVERFLOW bits. Write\nback the bits actually read instead so the driver avoids clobbering the\nOVERFLOW bit that comes after the register is read."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/dma/idxd/irq.c"], "versions": [{"version": "bfe1d56091c1a404b3d4ce7e9809d745fc4453bb", "lessThan": "a5ad12d5d69c63af289a37f05187a0c6fe93553d", "status": "affected", "versionType": "git"}, {"version": "bfe1d56091c1a404b3d4ce7e9809d745fc4453bb", "lessThan": "02981a44a0e402089775416371bd2e0c935685f8", "status": "affected", "versionType": "git"}, {"version": "bfe1d56091c1a404b3d4ce7e9809d745fc4453bb", "lessThan": "ea941ac294d75d0ace50797aebf0056f6f8f7a7f", "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/dma/idxd/irq.c"], "versions": [{"version": "5.6", "status": "affected"}, {"version": "0", "lessThan": "5.6", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.32", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.11.16", "lessThanOrEqual": "5.11.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.12", "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": "5.6", "versionEndExcluding": "5.10.32"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "5.11.16"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "5.12"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/a5ad12d5d69c63af289a37f05187a0c6fe93553d"}, {"url": "https://git.kernel.org/stable/c/02981a44a0e402089775416371bd2e0c935685f8"}, {"url": "https://git.kernel.org/stable/c/ea941ac294d75d0ace50797aebf0056f6f8f7a7f"}], "title": "dmaengine: idxd: Fix clobbering of SWERR overflow bit on writeback", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "lang": "en", "description": "CWE-noinfo Not enough information"}]}], "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2024-02-27T17:47:35.448029Z", "id": "CVE-2021-46920", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-10-29T13:46:36.802Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:17:42.983Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/a5ad12d5d69c63af289a37f05187a0c6fe93553d", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/02981a44a0e402089775416371bd2e0c935685f8", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/ea941ac294d75d0ace50797aebf0056f6f8f7a7f", "tags": ["x_transferred"]}]}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/a5ad12d5d69c63af289a37f05187a0c6fe93553d", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/02981a44a0e402089775416371bd2e0c935685f8", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/ea941ac294d75d0ace50797aebf0056f6f8f7a7f", "tags": ["x_transferred"]}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:17:42.983Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2021-46920", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-02-27T17:47:35.448029Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "description": "CWE-noinfo Not enough information"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-07-05T15:20:40.989Z"}}], "cna": {"title": "dmaengine: idxd: Fix clobbering of SWERR overflow bit on writeback", "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "bfe1d56091c1a404b3d4ce7e9809d745fc4453bb", "lessThan": "a5ad12d5d69c63af289a37f05187a0c6fe93553d", "versionType": "git"}, {"status": "affected", "version": "bfe1d56091c1a404b3d4ce7e9809d745fc4453bb", "lessThan": "02981a44a0e402089775416371bd2e0c935685f8", "versionType": "git"}, {"status": "affected", "version": "bfe1d56091c1a404b3d4ce7e9809d745fc4453bb", "lessThan": "ea941ac294d75d0ace50797aebf0056f6f8f7a7f", "versionType": "git"}], "programFiles": ["drivers/dma/idxd/irq.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.6"}, {"status": "unaffected", "version": "0", "lessThan": "5.6", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.32", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.11.16", "versionType": "semver", "lessThanOrEqual": "5.11.*"}, {"status": "unaffected", "version": "5.12", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/dma/idxd/irq.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/a5ad12d5d69c63af289a37f05187a0c6fe93553d"}, {"url": "https://git.kernel.org/stable/c/02981a44a0e402089775416371bd2e0c935685f8"}, {"url": "https://git.kernel.org/stable/c/ea941ac294d75d0ace50797aebf0056f6f8f7a7f"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: idxd: Fix clobbering of SWERR overflow bit on writeback\n\nCurrent code blindly writes over the SWERR and the OVERFLOW bits. Write\nback the bits actually read instead so the driver avoids clobbering the\nOVERFLOW bit that comes after the register is read."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.32", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.11.16", "versionStartIncluding": "5.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.12", "versionStartIncluding": "5.6"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2025-05-04T07:00:22.682Z"}}}, "cveMetadata": {"cveId": "CVE-2021-46920", "state": "PUBLISHED", "dateUpdated": "2025-05-04T07:00:22.682Z", "dateReserved": "2024-02-25T13:45:52.719Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-02-27T06:53:57.372Z", "assignerShortName": "Linux"}, "dataVersion": "5.1"}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "10B30767-6251-4101-9C1B-5F61DBAFA43A", "versionEndExcluding": "5.10.32", "versionStartIncluding": "5.6.0", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "3C5242B9-B5BD-4578-AD66-69DF59D54A14", "versionEndExcluding": "5.11.16", "versionStartIncluding": "5.11.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: idxd: Fix clobbering of SWERR overflow bit on writeback\n\nCurrent code blindly writes over the SWERR and the OVERFLOW bits. Write\nback the bits actually read instead so the driver avoids clobbering the\nOVERFLOW bit that comes after the register is read."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: dmaengine: idxd: corrige el problema del bit de desbordamiento SWERR en la reescritura El c\u00f3digo actual escribe ciegamente sobre los bits SWERR y OVERFLOW. En su lugar, vuelva a escribir los bits realmente le\u00eddos para que el controlador evite da\u00f1ar el bit OVERFLOW que viene despu\u00e9s de leer el registro."}], "id": "CVE-2021-46920", "lastModified": "2024-11-21T06:34:56.077", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "NONE", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2024-02-27T07:15:08.987", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/02981a44a0e402089775416371bd2e0c935685f8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a5ad12d5d69c63af289a37f05187a0c6fe93553d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ea941ac294d75d0ace50797aebf0056f6f8f7a7f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/02981a44a0e402089775416371bd2e0c935685f8"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a5ad12d5d69c63af289a37f05187a0c6fe93553d"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ea941ac294d75d0ace50797aebf0056f6f8f7a7f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: clobbering of SWERR overflow bit on writeback", "id": "2266398", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2266398"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N", "status": "draft"}, "cwe": "CWE-353", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndmaengine: idxd: Fix clobbering of SWERR overflow bit on writeback\nCurrent code blindly writes over the SWERR and the OVERFLOW bits. Write\nback the bits actually read instead so the driver avoids clobbering the\nOVERFLOW bit that comes after the register is read.", "A flaw was found in the Linux Kernel. The current code blindly writes over the SWERR and OVERFLOW bits. Write back the bits read so that the driver avoids clobbering the OVERFLOW bit that comes after the register is read."], "name": "CVE-2021-46920", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Under investigation", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-02-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-46920\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-46920\nhttps://git.kernel.org/stable/c/02981a44a0e402089775416371bd2e0c935685f8\nhttps://git.kernel.org/stable/c/a5ad12d5d69c63af289a37f05187a0c6fe93553d\nhttps://git.kernel.org/stable/c/ea941ac294d75d0ace50797aebf0056f6f8f7a7f"], "threat_severity": "Low"}