CVE-2022-49030

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Only\ncasting max_entries to size_t is not enough, because for 32-bits\napplication on 64-bits kernel the size of read-only mmap region\nalso could overflow size_t.\n\nSo fixing it by casting the size of read-only mmap region into a __u64\nand checking whether or not there will be overflow during mmap."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is in userspace libbpf (`ring_buffer__add` in tools/lib/bpf/ringbuf.c), reached only when a local process mmaps a BPF_MAP_TYPE_RINGBUF fd; no network or adjacent-protocol path exists.\nAC:L - Creating a 2GB (power-of-two) RINGBUF and calling ring_buffer__new/__add deterministically overflows `2 * max_entries` as u32, so mmap maps only one page; no race or attacker-uncontrollable layout is required.\nPR:L - Unprivileged local users can open this path when unprivileged BPF is enabled (common across much of the affected 5.8+ window), and CAP_BPF alone (not full root) suffices when unprivileged BPF is disabled.\nUI:N - The attacker runs an affected libbpf consumer end-to-end against their own (or an attacker-supplied) map fd; no separate victim action is required.\nS:U - Corruption is confined to the calling process\u2019s address space; libbpf and its caller share one security authority with no VM/IOMMU/sandbox escape.\nC:H - With mask\u22482GB-1 over a one-page mapping, ringbuf_process_ring indexes far beyond the VMA and can read adjacent readable mappings, and sample callbacks receive those wild pointers.\nI:H - On 64-bit, ringbuf_unmap_ring munmaps ~4GiB from a 4KiB mapping and tears down neighboring VMAs, a classic unmap/remap memory-corruption primitive that enables control-flow hijack in the process.\nA:H - Consume walks unmapped addresses and causes SIGSEGV, and the oversized munmap can unmap libraries/heap and crash the process; both are repeatable at will."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["tools/lib/bpf/ringbuf.c"], "versions": [{"version": "bf99c936f9478a05d51e9f101f90de70bee9a89c", "lessThan": "8a549ab6724520aa3c07f47e0eba820293551490", "status": "affected", "versionType": "git"}, {"version": "bf99c936f9478a05d51e9f101f90de70bee9a89c", "lessThan": "0140e079a42064680394fff1199a7b5483688dec", "status": "affected", "versionType": "git"}, {"version": "bf99c936f9478a05d51e9f101f90de70bee9a89c", "lessThan": "535a25ab4f9a45f74ba38ab71de95e97474922ed", "status": "affected", "versionType": "git"}, {"version": "bf99c936f9478a05d51e9f101f90de70bee9a89c", "lessThan": "927cbb478adf917e0a142b94baa37f06279cc466", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["tools/lib/bpf/ringbuf.c"], "versions": [{"version": "5.8", "status": "affected"}, {"version": "0", "lessThan": "5.8", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.158", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.82", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.0.12", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1", "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": "5.8", "versionEndExcluding": "5.10.158"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "5.15.82"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.0.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/8a549ab6724520aa3c07f47e0eba820293551490"}, {"url": "https://git.kernel.org/stable/c/0140e079a42064680394fff1199a7b5483688dec"}, {"url": "https://git.kernel.org/stable/c/535a25ab4f9a45f74ba38ab71de95e97474922ed"}, {"url": "https://git.kernel.org/stable/c/927cbb478adf917e0a142b94baa37f06279cc466"}], "title": "libbpf: Handle size overflow for ringbuf mmap", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2022-49030", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-10-22T13:11:21.316890Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-10-22T13:18:35.905Z"}}]}}

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Only\ncasting max_entries to size_t is not enough, because for 32-bits\napplication on 64-bits kernel the size of read-only mmap region\nalso could overflow size_t.\n\nSo fixing it by casting the size of read-only mmap region into a __u64\nand checking whether or not there will be overflow during mmap."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: libbpf: desbordamiento de tama\u00f1o del controlador para ringbuf mmap El tama\u00f1o m\u00e1ximo de ringbuf es de 2 GB en un host x86-64, por lo que 2 * max_entries desbordar\u00e1n u32 al asignar la p\u00e1gina del productor y las p\u00e1ginas de datos. Solo convertir max_entries a size_t no es suficiente, porque para la aplicaci\u00f3n de 32 bits en un kernel de 64 bits, el tama\u00f1o de la regi\u00f3n mmap de solo lectura tambi\u00e9n podr\u00eda desbordar size_t. Entonces, arr\u00e9glelo convirtiendo el tama\u00f1o de la regi\u00f3n mmap de solo lectura en __u64 y verificando si habr\u00e1 o no desbordamiento durante mmap."}], "id": "CVE-2022-49030", "lastModified": "2026-08-04T10:17:32.040", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2022-49030", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-10-22T13:11:21.316890Z", "version": "2.0.3"}}]}, "published": "2024-10-21T20:15:13.747", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0140e079a42064680394fff1199a7b5483688dec"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/535a25ab4f9a45f74ba38ab71de95e97474922ed"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8a549ab6724520aa3c07f47e0eba820293551490"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/927cbb478adf917e0a142b94baa37f06279cc466"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-190"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: libbpf: Handle size overflow for ringbuf mmap", "id": "2320776", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2320776"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-190", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nlibbpf: Handle size overflow for ringbuf mmap\nThe maximum size of ringbuf is 2GB on x86-64 host, so 2 * max_entries\nwill overflow u32 when mapping producer page and data pages. Only\ncasting max_entries to size_t is not enough, because for 32-bits\napplication on 64-bits kernel the size of read-only mmap region\nalso could overflow size_t.\nSo fixing it by casting the size of read-only mmap region into a __u64\nand checking whether or not there will be overflow during mmap."], "name": "CVE-2022-49030", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not 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": "2024-10-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-49030\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-49030\nhttps://lore.kernel.org/linux-cve-announce/2024102155-CVE-2022-49030-cee8@gregkh/T"], "statement": "BPF is a privileged operation on RHEL Kernel.", "threat_severity": "Low"}

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