{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-49030", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-08-22T01:27:53.651Z", "datePublished": "2024-10-21T20:06:34.571Z", "dateUpdated": "2026-08-05T08:53:34.621Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:53:34.621Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlibbpf: Handle size overflow for ringbuf mmap\n\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.\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’s address space; libbpf and its caller share one security authority with no VM/IOMMU/sandbox escape.\nC:H - With mask≈2GB-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" } } ] } }