214 lines
11 KiB
JSON
214 lines
11 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2022-49030",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-08-22T01:27:53.651Z",
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"datePublished": "2024-10-21T20:06:34.571Z",
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"dateUpdated": "2026-08-05T08:53:34.621Z"
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},
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"dateUpdated": "2026-08-05T08:53:34.621Z"
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{
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"lang": "en",
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"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."
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},
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{
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"lang": "en",
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"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."
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}
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]
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}
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"tools/lib/bpf/ringbuf.c"
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"url": "https://git.kernel.org/stable/c/8a549ab6724520aa3c07f47e0eba820293551490"
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"title": "libbpf: Handle size overflow for ringbuf mmap",
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"id": "CVE-2022-49030",
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