CVE-2022-49030 (GCVE-0-2022-49030)

Vulnerability from cvelistv5 – Published: 2024-10-21 20:06 – Updated: 2026-08-05 08:53
VLAI
Title
libbpf: Handle size overflow for ringbuf mmap
Summary
In the Linux kernel, the following vulnerability has been resolved: libbpf: Handle size overflow for ringbuf mmap The maximum size of ringbuf is 2GB on x86-64 host, so 2 * max_entries will overflow u32 when mapping producer page and data pages. Only casting max_entries to size_t is not enough, because for 32-bits application on 64-bits kernel the size of read-only mmap region also could overflow size_t. So fixing it by casting the size of read-only mmap region into a __u64 and checking whether or not there will be overflow during mmap.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-10-22 13:11 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: bf99c936f9478a05d51e9f101f90de70bee9a89c , < 8a549ab6724520aa3c07f47e0eba820293551490 (git)
Affected: bf99c936f9478a05d51e9f101f90de70bee9a89c , < 0140e079a42064680394fff1199a7b5483688dec (git)
Affected: bf99c936f9478a05d51e9f101f90de70bee9a89c , < 535a25ab4f9a45f74ba38ab71de95e97474922ed (git)
Affected: bf99c936f9478a05d51e9f101f90de70bee9a89c , < 927cbb478adf917e0a142b94baa37f06279cc466 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.8
Unaffected: 0 , < 5.8 (semver)
Unaffected: 5.10.158 , ≤ 5.10.* (semver)
Unaffected: 5.15.82 , ≤ 5.15.* (semver)
Unaffected: 6.0.12 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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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."
          },
          {
            "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": {
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              "cvssData": {
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                "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",
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              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
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                "baseScore": 7.8,
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                "confidentialityImpact": "HIGH",
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                "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"
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              "impactScore": 5.9,
              "source": "nvd@nist.gov",
              "type": "Primary"
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        "published": "2024-10-21T20:15:13.747",
        "references": [
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            "source": "nvd@nist.gov",
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    "redhat_vex": {
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      "cve": "CVE-2022-49030",
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      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: libbpf: Handle size overflow for ringbuf mmap",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49030.json",
      "version": "3"
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    "suse_vex": {
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      "cve": "CVE-2022-49030",
      "id": "CVE-2022-49030",
      "initial_release_date": "2024-10-22T14:21:52Z",
      "product_status:known_affected": "187",
      "product_status:known_not_affected": "318",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-49030",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-49030.json",
      "version": "23"
    },
    "vulnrichment": {
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                    "id": "CVE-2022-49030",
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                      },
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              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
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        ],
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              "product": "Linux",
              "programFiles": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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                {
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          "cpeApplicability": [
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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\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."
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        "cveId": "CVE-2022-49030",
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.