CVE-2023-53221

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That can be verified by checking /proc/kallsyms.\n\nThis meamleak can be verified by a simple bpf program as follows:\n\n SEC(\"fentry/trap_init\")\n int fentry_run()\n {\n return 0;\n }\n\nIt will fail to attach trap_init because this function is freed after\nkernel init, and then we can find the trampoline image is left in the\nsystem by checking /proc/kallsyms.\n\n $ tail /proc/kallsyms\n ffffffffc0613000 t bpf_trampoline_6442453466_1 [bpf]\n ffffffffc06c3000 t bpf_trampoline_6442453466_1 [bpf]\n\n $ bpftool btf dump file /sys/kernel/btf/vmlinux | grep \"FUNC 'trap_init'\"\n [2522] FUNC 'trap_init' type_id=119 linkage=static\n\n $ echo $((6442453466 & 0x7fffffff))\n 2522\n\nNote that there are two left bpf trampoline images, that is because the\nlibbpf will fallback to raw tracepoint if -EINVAL is returned."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", 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"https://git.kernel.org/stable/c/6aa27775db63ba8c7c73891c7dfb71ddc230c48d"}, {"url": "https://git.kernel.org/stable/c/108598c39eefbedc9882273ac0df96127a629220"}], "title": "bpf: Fix memleak due to fentry attach failure", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"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:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2023-53221", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-01-14T17:50:19.613865Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-401", "description": "CWE-401 Missing Release of Memory after Effective Lifetime"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-01-14T17:52:59.043Z"}}]}}

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That can be verified by checking /proc/kallsyms.\n\nThis meamleak can be verified by a simple bpf program as follows:\n\n SEC(\"fentry/trap_init\")\n int fentry_run()\n {\n return 0;\n }\n\nIt will fail to attach trap_init because this function is freed after\nkernel init, and then we can find the trampoline image is left in the\nsystem by checking /proc/kallsyms.\n\n $ tail /proc/kallsyms\n ffffffffc0613000 t bpf_trampoline_6442453466_1 [bpf]\n ffffffffc06c3000 t bpf_trampoline_6442453466_1 [bpf]\n\n $ bpftool btf dump file /sys/kernel/btf/vmlinux | grep \"FUNC 'trap_init'\"\n [2522] FUNC 'trap_init' type_id=119 linkage=static\n\n $ echo $((6442453466 & 0x7fffffff))\n 2522\n\nNote that there are two left bpf trampoline images, that is because the\nlibbpf will fallback to raw tracepoint if -EINVAL is returned."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.39", "versionStartIncluding": "5.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.3.13", "versionStartIncluding": "5.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.4.4", "versionStartIncluding": "5.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.5", "versionStartIncluding": "5.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "5.10.28"}, {"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": "2026-05-23T15:28:16.750Z"}}}, "cveMetadata": {"cveId": "CVE-2023-53221", "state": "PUBLISHED", "dateUpdated": "2026-05-23T15:28:16.750Z", "dateReserved": "2025-09-15T14:19:21.845Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-09-15T14:21:50.053Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["kernel/bpf/trampoline.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "20109ddd5bea2c24d790debf5d02584ef24c3f5e", "status": "affected", "version": "e21aa341785c679dd409c8cb71f864c00fe6c463", "versionType": "git"}, {"lessThan": "f72c67d1a82dada7d6d504c806e111e913721a30", "status": "affected", "version": "e21aa341785c679dd409c8cb71f864c00fe6c463", "versionType": "git"}, {"lessThan": "6aa27775db63ba8c7c73891c7dfb71ddc230c48d", "status": "affected", "version": "e21aa341785c679dd409c8cb71f864c00fe6c463", "versionType": "git"}, {"lessThan": "108598c39eefbedc9882273ac0df96127a629220", "status": "affected", "version": "e21aa341785c679dd409c8cb71f864c00fe6c463", "versionType": "git"}, {"status": "affected", "version": "e21d2b92354b3cd25dd774ebb0f0e52ff04a7861", "versionType": "git"}, {"status": "affected", "version": "85d177f56e5256e14b74a65940f981f6e3e8bb32", "versionType": "git"}, {"lessThan": "5.11", "status": "affected", "version": "5.10.28", "versionType": "semver"}, {"lessThan": "5.12", "status": "affected", "version": "5.11.11", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["kernel/bpf/trampoline.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": "6.1.*", "status": "unaffected", "version": "6.1.39", "versionType": "semver"}, {"lessThanOrEqual": "6.3.*", "status": "unaffected", "version": "6.3.13", "versionType": "semver"}, {"lessThanOrEqual": "6.4.*", "status": "unaffected", "version": "6.4.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.5", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "5FB238AF-DE30-4383-9FB7-1425BA8B9BCC", "versionEndExcluding": "5.11", "versionStartIncluding": "5.10.28", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "18E94C1C-980B-4CC6-9C63-60B225E69968", "versionEndExcluding": "5.12", "versionStartIncluding": "5.11.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "E08F6A3C-3F8B-445B-97DB-1D37F6D7B2E1", "versionEndExcluding": "6.1.39", "versionStartIncluding": "5.12.1", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "95CB4836-7F5D-4C20-B025-8E046EC87B78", "versionEndExcluding": "6.3.13", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "6AB81046-CB69-4115-924C-963B37C41385", "versionEndExcluding": "6.4.4", "versionStartIncluding": "6.4", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.12:-:*:*:*:*:*:*", "matchCriteriaId": "75EB504D-4A83-4C67-9C8D-FD9C6C8EB4CD", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.12:rc5:*:*:*:*:*:*", "matchCriteriaId": "A935F9F1-DA8B-49F4-BF2B-FA01A92F113E", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.12:rc6:*:*:*:*:*:*", "matchCriteriaId": "DF0AF673-12B7-4274-9090-411D4939CB62", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.12:rc7:*:*:*:*:*:*", "matchCriteriaId": "06AE06A6-A0C3-4556-BFFA-3D6E4BAC43C8", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.12:rc8:*:*:*:*:*:*", "matchCriteriaId": "FCE63934-38CF-4311-AD72-624E86AF3889", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix memleak due to fentry attach failure\n\nIf it fails to attach fentry, the allocated bpf trampoline image will be\nleft in the system. That can be verified by checking /proc/kallsyms.\n\nThis meamleak can be verified by a simple bpf program as follows:\n\n SEC(\"fentry/trap_init\")\n int fentry_run()\n {\n return 0;\n }\n\nIt will fail to attach trap_init because this function is freed after\nkernel init, and then we can find the trampoline image is left in the\nsystem by checking /proc/kallsyms.\n\n $ tail /proc/kallsyms\n ffffffffc0613000 t bpf_trampoline_6442453466_1 [bpf]\n ffffffffc06c3000 t bpf_trampoline_6442453466_1 [bpf]\n\n $ bpftool btf dump file /sys/kernel/btf/vmlinux | grep \"FUNC 'trap_init'\"\n [2522] FUNC 'trap_init' type_id=119 linkage=static\n\n $ echo $((6442453466 & 0x7fffffff))\n 2522\n\nNote that there are two left bpf trampoline images, that is because the\nlibbpf will fallback to raw tracepoint if -EINVAL is returned."}], "id": "CVE-2023-53221", "lastModified": "2026-06-17T06:44:32.793", "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"}, {"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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2023-53221", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-01-14T17:50:19.613865Z", "version": "2.0.3"}}]}, "published": "2025-09-15T15:15:48.873", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/108598c39eefbedc9882273ac0df96127a629220"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/20109ddd5bea2c24d790debf5d02584ef24c3f5e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6aa27775db63ba8c7c73891c7dfb71ddc230c48d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f72c67d1a82dada7d6d504c806e111e913721a30"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-401"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: bpf: Fix memleak due to fentry attach failure", "id": "2395223", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2395223"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2023-53221", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"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": "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": "2025-09-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-53221\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-53221\nhttps://lore.kernel.org/linux-cve-announce/2025091513-CVE-2023-53221-c23e@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-09-17T10:07:45.316182+00:00", "updated": "2025-09-17T10:07:45.316235+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}