CVE-2021-47374

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2021-47374", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-21T14:58:30.811Z", "datePublished": "2024-05-21T15:03:38.436Z", "dateUpdated": "2026-08-05T08:47:30.228Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:47:30.228Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndma-debug: prevent an error message from causing runtime problems\n\nFor some drivers, that use the DMA API. This error message can be reached\nseveral millions of times per second, causing spam to the kernel's printk\nbuffer and bringing the CPU usage up to 100% (so, it should be rate\nlimited). However, since there is at least one driver that is in the\nmainline and suffers from the error condition, it is more useful to\nerr_printk() here instead of just rate limiting the error message (in hopes\nthat it will make it easier for other drivers that suffer from this issue\nto be spotted)."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - The vulnerable path is reached when a network NIC (notably fsl_dpaa2_eth) performs DMA mapping while processing packets; a remote peer sending traffic can drive millions of dma_map calls per second through this code.\nAC:L - Once CONFIG_DMA_API_DEBUG is enabled and a driver with overlapping mappings is present, the attacker reliably triggers the flood simply by generating high-rate network traffic with no race or special timing required.\nPR:N - No authentication or local account is required; unauthenticated remote packets that cause the NIC to map DMA buffers are sufficient to hit the unrate-limited pr_err path.\nUI:N - Exploitation requires no victim user action beyond the system already running with the affected driver receiving or transmitting network traffic.\nS:U - The DoS affects only the local kernel/system availability and does not cross a security boundary such as a VM, IOMMU, or sandbox escape.\nC:N - The bug only floods an error string via pr_err; it does not read, leak, or expose kernel or user memory contents.\nI:N - There is no memory corruption, write primitive, or control-flow hijack in this defect\u2014only excessive logging\u2014so integrity is unaffected.\nA:H - The unrate-limited error can fire millions of times per second, saturating the printk buffer and driving CPU to 100%, fully denying service as documented in the original report."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/dma/debug.c"], "versions": [{"version": "2b4bbc6231d789f58676d2ccc42177df163e1c4a", "lessThan": "de4afec2d2946c92c62a15ab341c70b287289e6a", "status": "affected", "versionType": "git"}, {"version": "2b4bbc6231d789f58676d2ccc42177df163e1c4a", "lessThan": "510e1a724ab1bf38150be2c1acabb303f98d0047", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/dma/debug.c"], "versions": [{"version": "5.14", "status": "affected"}, {"version": "0", "lessThan": "5.14", "status": "unaffected", "versionType": "semver"}, {"version": "5.14.9", "lessThanOrEqual": "5.14.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15", "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": "5.14", "versionEndExcluding": "5.14.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14", "versionEndExcluding": "5.15"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/de4afec2d2946c92c62a15ab341c70b287289e6a"}, {"url": "https://git.kernel.org/stable/c/510e1a724ab1bf38150be2c1acabb303f98d0047"}], "title": "dma-debug: prevent an error message from causing runtime problems", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:32:08.654Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/de4afec2d2946c92c62a15ab341c70b287289e6a", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/510e1a724ab1bf38150be2c1acabb303f98d0047", "tags": ["x_transferred"]}]}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47374", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-09-10T15:38:22.986319Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T17:33:56.494Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/de4afec2d2946c92c62a15ab341c70b287289e6a", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/510e1a724ab1bf38150be2c1acabb303f98d0047", "tags": ["x_transferred"]}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:32:08.654Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47374", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-09-10T15:38:22.986319Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T12:42:19.748Z"}}], "cna": {"title": "dma-debug: prevent an error message from causing runtime problems", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.5, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}, "scenarios": [{"lang": "en", "value": "AV:N - The vulnerable path is reached when a network NIC (notably fsl_dpaa2_eth) performs DMA mapping while processing packets; a remote peer sending traffic can drive millions of dma_map calls per second through this code.\nAC:L - Once CONFIG_DMA_API_DEBUG is enabled and a driver with overlapping mappings is present, the attacker reliably triggers the flood simply by generating high-rate network traffic with no race or special timing required.\nPR:N - No authentication or local account is required; unauthenticated remote packets that cause the NIC to map DMA buffers are sufficient to hit the unrate-limited pr_err path.\nUI:N - Exploitation requires no victim user action beyond the system already running with the affected driver receiving or transmitting network traffic.\nS:U - The DoS affects only the local kernel/system availability and does not cross a security boundary such as a VM, IOMMU, or sandbox escape.\nC:N - The bug only floods an error string via pr_err; it does not read, leak, or expose kernel or user memory contents.\nI:N - There is no memory corruption, write primitive, or control-flow hijack in this defect\u2014only excessive logging\u2014so integrity is unaffected.\nA:H - The unrate-limited error can fire millions of times per second, saturating the printk buffer and driving CPU to 100%, fully denying service as documented in the original report."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2b4bbc6231d789f58676d2ccc42177df163e1c4a", "lessThan": "de4afec2d2946c92c62a15ab341c70b287289e6a", "versionType": "git"}, {"status": "affected", "version": "2b4bbc6231d789f58676d2ccc42177df163e1c4a", "lessThan": "510e1a724ab1bf38150be2c1acabb303f98d0047", "versionType": "git"}], "programFiles": ["kernel/dma/debug.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.14"}, {"status": "unaffected", "version": "0", "lessThan": "5.14", "versionType": "semver"}, {"status": "unaffected", "version": "5.14.9", "versionType": "semver", "lessThanOrEqual": "5.14.*"}, {"status": "unaffected", "version": "5.15", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["kernel/dma/debug.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/de4afec2d2946c92c62a15ab341c70b287289e6a"}, {"url": "https://git.kernel.org/stable/c/510e1a724ab1bf38150be2c1acabb303f98d0047"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndma-debug: prevent an error message from causing runtime problems\n\nFor some drivers, that use the DMA API. This error message can be reached\nseveral millions of times per second, causing spam to the kernel's printk\nbuffer and bringing the CPU usage up to 100% (so, it should be rate\nlimited). However, since there is at least one driver that is in the\nmainline and suffers from the error condition, it is more useful to\nerr_printk() here instead of just rate limiting the error message (in hopes\nthat it will make it easier for other drivers that suffer from this issue\nto be spotted)."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.14.9", "versionStartIncluding": "5.14"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15", "versionStartIncluding": "5.14"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:47:30.228Z"}}}, "cveMetadata": {"cveId": "CVE-2021-47374", "state": "PUBLISHED", "dateUpdated": "2026-08-05T08:47:30.228Z", "dateReserved": "2024-05-21T14:58:30.811Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-05-21T15:03:38.436Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/dma/debug.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "de4afec2d2946c92c62a15ab341c70b287289e6a", "status": "affected", "version": "2b4bbc6231d789f58676d2ccc42177df163e1c4a", "versionType": "git"}, {"lessThan": "510e1a724ab1bf38150be2c1acabb303f98d0047", "status": "affected", "version": "2b4bbc6231d789f58676d2ccc42177df163e1c4a", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/dma/debug.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.14"}, {"lessThan": "5.14", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.14.*", "status": "unaffected", "version": "5.14.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "5.15", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "B3920349-3546-4942-8807-8BC57C8D46BC", "versionEndExcluding": "5.14.9", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*", "matchCriteriaId": "E46C74C6-B76B-4C94-A6A4-FD2FFF62D644", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndma-debug: prevent an error message from causing runtime problems\n\nFor some drivers, that use the DMA API. This error message can be reached\nseveral millions of times per second, causing spam to the kernel's printk\nbuffer and bringing the CPU usage up to 100% (so, it should be rate\nlimited). However, since there is at least one driver that is in the\nmainline and suffers from the error condition, it is more useful to\nerr_printk() here instead of just rate limiting the error message (in hopes\nthat it will make it easier for other drivers that suffer from this issue\nto be spotted)."}, {"lang": "es", "value": "En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: dma-debug: evita que un mensaje de error cause problemas de tiempo de ejecuci\u00f3n Para algunos controladores, que utilizan la API DMA. Este mensaje de error puede aparecer varios millones de veces por segundo, provocando spam en el b\u00fafer printk del kernel y elevando el uso de la CPU hasta el 100% (por lo tanto, deber\u00eda tener una velocidad limitada). Sin embargo, dado que hay al menos un controlador que est\u00e1 en la l\u00ednea principal y sufre la condici\u00f3n de error, es m\u00e1s \u00fatil err_printk() aqu\u00ed en lugar de simplemente limitar el valor del mensaje de error (con la esperanza de que as\u00ed sea m\u00e1s f\u00e1cil para otros controladores). que sufren este problema para ser detectados)."}], "id": "CVE-2021-47374", "lastModified": "2026-08-04T10:17:00.387", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47374", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T15:38:22.986319Z", "version": "2.0.3"}}]}, "published": "2024-05-21T15:15:23.223", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/510e1a724ab1bf38150be2c1acabb303f98d0047"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/de4afec2d2946c92c62a15ab341c70b287289e6a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/510e1a724ab1bf38150be2c1acabb303f98d0047"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/de4afec2d2946c92c62a15ab341c70b287289e6a"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: dma-debug: prevent an error message from causing runtime problems", "id": "2282372", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282372"}, "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:N/A:H", "status": "draft"}, "cwe": "CWE-779", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndma-debug: prevent an error message from causing runtime problems\nFor some drivers, that use the DMA API. This error message can be reached\nseveral millions of times per second, causing spam to the kernel's printk\nbuffer and bringing the CPU usage up to 100% (so, it should be rate\nlimited). However, since there is at least one driver that is in the\nmainline and suffers from the error condition, it is more useful to\nerr_printk() here instead of just rate limiting the error message (in hopes\nthat it will make it easier for other drivers that suffer from this issue\nto be spotted)."], "name": "CVE-2021-47374", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47374\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47374\nhttps://lore.kernel.org/linux-cve-announce/2024052141-CVE-2021-47374-41c2@gregkh/T"], "threat_severity": "Low"}

{}