CVE-2021-47116

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2021-47116", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-03-04T18:12:48.837Z", "datePublished": "2024-03-15T20:14:23.564Z", "dateUpdated": "2026-05-23T15:19:20.674Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-23T15:19:20.674Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix memory leak in ext4_mb_init_backend on error path.\n\nFix a memory leak discovered by syzbot when a file system is corrupted\nwith an illegally large s_log_groups_per_flex."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ext4/mballoc.c"], "versions": [{"version": "df61d3cff422433527d3bc388f69484f0781d226", "lessThan": "2050c6e5b161e5e25ce3c420fef58b24fa388a49", "status": "affected", "versionType": "git"}, {"version": "f91436d55a279f045987e8b8c1385585dca54be9", "lessThan": "04fb2baa0b147f51db065a1b13a11954abe592d0", "status": "affected", "versionType": "git"}, {"version": "f91436d55a279f045987e8b8c1385585dca54be9", "lessThan": "a8867f4e3809050571c98de7a2d465aff5e4daf5", "status": "affected", "versionType": "git"}, {"version": "9e7af67e9521fb5cbb5b01aca22921c313c2e48e", "status": "affected", "versionType": "git"}, {"version": "5.10.27", "lessThan": "5.10.43", "status": "affected", "versionType": "semver"}, {"version": "5.11.11", "lessThan": "5.12", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ext4/mballoc.c"], "versions": [{"version": "5.12", "status": "affected"}, {"version": "0", "lessThan": "5.12", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.43", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.12.10", "lessThanOrEqual": "5.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.13", "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": "5.10.27", "versionEndExcluding": "5.10.43"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "5.12.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.12", "versionEndExcluding": "5.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11.11"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/2050c6e5b161e5e25ce3c420fef58b24fa388a49"}, {"url": "https://git.kernel.org/stable/c/04fb2baa0b147f51db065a1b13a11954abe592d0"}, {"url": "https://git.kernel.org/stable/c/a8867f4e3809050571c98de7a2d465aff5e4daf5"}], "title": "ext4: fix memory leak in ext4_mb_init_backend on error path.", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47116", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-04-05T17:36:29.410225Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:13:30.143Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:24:39.910Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/2050c6e5b161e5e25ce3c420fef58b24fa388a49", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/04fb2baa0b147f51db065a1b13a11954abe592d0", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/a8867f4e3809050571c98de7a2d465aff5e4daf5", "tags": ["x_transferred"]}]}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/2050c6e5b161e5e25ce3c420fef58b24fa388a49", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/04fb2baa0b147f51db065a1b13a11954abe592d0", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/a8867f4e3809050571c98de7a2d465aff5e4daf5", "tags": ["x_transferred"]}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:24:39.910Z"}}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47116", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-04-05T17:36:29.410225Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-05-23T19:01:22.227Z"}, "title": "CISA ADP Vulnrichment"}], "cna": {"title": "ext4: fix memory leak in ext4_mb_init_backend on error path.", "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "df61d3cff422433527d3bc388f69484f0781d226", "lessThan": "2050c6e5b161e5e25ce3c420fef58b24fa388a49", "versionType": "git"}, {"status": "affected", "version": "f91436d55a279f045987e8b8c1385585dca54be9", "lessThan": "04fb2baa0b147f51db065a1b13a11954abe592d0", "versionType": "git"}, {"status": "affected", "version": "f91436d55a279f045987e8b8c1385585dca54be9", "lessThan": "a8867f4e3809050571c98de7a2d465aff5e4daf5", "versionType": "git"}, {"status": "affected", "version": "9e7af67e9521fb5cbb5b01aca22921c313c2e48e", "versionType": "git"}, {"status": "affected", "version": "5.10.27", "lessThan": "5.10.43", "versionType": "semver"}, {"status": "affected", "version": "5.11.11", "lessThan": "5.12", "versionType": "semver"}], "programFiles": ["fs/ext4/mballoc.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.12"}, {"status": "unaffected", "version": "0", "lessThan": "5.12", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.43", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.12.10", "versionType": "semver", "lessThanOrEqual": "5.12.*"}, {"status": "unaffected", "version": "5.13", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/ext4/mballoc.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/2050c6e5b161e5e25ce3c420fef58b24fa388a49"}, {"url": "https://git.kernel.org/stable/c/04fb2baa0b147f51db065a1b13a11954abe592d0"}, {"url": "https://git.kernel.org/stable/c/a8867f4e3809050571c98de7a2d465aff5e4daf5"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix memory leak in ext4_mb_init_backend on error path.\n\nFix a memory leak discovered by syzbot when a file system is corrupted\nwith an illegally large s_log_groups_per_flex."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.43", "versionStartIncluding": "5.10.27"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.12.10", "versionStartIncluding": "5.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.13", "versionStartIncluding": "5.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "5.11.11"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-23T15:19:20.674Z"}}}, "cveMetadata": {"cveId": "CVE-2021-47116", "state": "PUBLISHED", "dateUpdated": "2026-05-23T15:19:20.674Z", "dateReserved": "2024-03-04T18:12:48.837Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-03-15T20:14:23.564Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/ext4/mballoc.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "2050c6e5b161e5e25ce3c420fef58b24fa388a49", "status": "affected", "version": "df61d3cff422433527d3bc388f69484f0781d226", "versionType": "git"}, {"lessThan": "04fb2baa0b147f51db065a1b13a11954abe592d0", "status": "affected", "version": "f91436d55a279f045987e8b8c1385585dca54be9", "versionType": "git"}, {"lessThan": "a8867f4e3809050571c98de7a2d465aff5e4daf5", "status": "affected", "version": "f91436d55a279f045987e8b8c1385585dca54be9", "versionType": "git"}, {"status": "affected", "version": "9e7af67e9521fb5cbb5b01aca22921c313c2e48e", "versionType": "git"}, {"lessThan": "5.10.43", "status": "affected", "version": "5.10.27", "versionType": "semver"}, {"lessThan": "5.12", "status": "affected", "version": "5.11.11", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/ext4/mballoc.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.12"}, {"lessThan": "5.12", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.43", "versionType": "semver"}, {"lessThanOrEqual": "5.12.*", "status": "unaffected", "version": "5.12.10", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "5.13", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "EED29F26-07A5-4096-A687-701C4F98A541", "versionEndExcluding": "5.10.43", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "27384800-AB48-4C08-891E-34B66F5FC4AA", "versionEndExcluding": "5.12.10", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*", "matchCriteriaId": "0CBAD0FC-C281-4666-AB2F-F8E6E1165DF7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*", "matchCriteriaId": "96AC23B2-D46A-49D9-8203-8E1BEDCA8532", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:*", "matchCriteriaId": "DA610E30-717C-4700-9F77-A3C9244F3BFD", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:*", "matchCriteriaId": "1ECD33F5-85BE-430B-8F86-8D7BD560311D", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix memory leak in ext4_mb_init_backend on error path.\n\nFix a memory leak discovered by syzbot when a file system is corrupted\nwith an illegally large s_log_groups_per_flex."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: ext4: corrige la p\u00e9rdida de memoria en ext4_mb_init_backend en la ruta de error. Solucione una p\u00e9rdida de memoria descubierta por syzbot cuando un sistema de archivos est\u00e1 da\u00f1ado con un s_log_groups_per_flex ilegalmente grande."}], "id": "CVE-2021-47116", "lastModified": "2026-06-17T04:16:31.930", "metrics": {"cvssMetricV31": [{"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-2021-47116", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-04-05T17:36:29.410225Z", "version": "2.0.3"}}]}, "published": "2024-03-15T21:15:06.837", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/04fb2baa0b147f51db065a1b13a11954abe592d0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2050c6e5b161e5e25ce3c420fef58b24fa388a49"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a8867f4e3809050571c98de7a2d465aff5e4daf5"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/04fb2baa0b147f51db065a1b13a11954abe592d0"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2050c6e5b161e5e25ce3c420fef58b24fa388a49"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a8867f4e3809050571c98de7a2d465aff5e4daf5"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ext4: fix memory leak in ext4_mb_init_backend on error path.", "id": "2269861", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2269861"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-402", "details": ["In the Linux kernel, the following vulnerability has been resolved:\next4: fix memory leak in ext4_mb_init_backend on error path.\nFix a memory leak discovered by syzbot when a file system is corrupted\nwith an illegally large s_log_groups_per_flex."], "name": "CVE-2021-47116", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "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": "2024-03-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47116\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47116\nhttps://lore.kernel.org/linux-cve-announce/2024031508-CVE-2021-47116-8383@gregkh/T/#u"], "threat_severity": "Low"}

{}