GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration
lsn-0083-1
Vulnerability from osv_ubuntu
Published
2022-01-06 08:48
Modified
2026-06-03 10:46
Summary
Kernel Live Patch Security Notice
Details

The BPF subsystem in the Linux kernel before 4.17 mishandles situations with a long jump over an instruction sequence where inner instructions require substantial expansions into multiple BPF instructions, leading to an overflow. This affects kernel/bpf/core.c and net/core/filter.c.(CVE-2018-25020)

Maxim Levitsky discovered that the KVM hypervisor implementation for AMD processors in the Linux kernel did not properly prevent a guest VM from enabling AVIC in nested guest VMs. An attacker in a guest VM could use this to write to portions of the host's physical memory.(CVE-2021-3653)

Nadav Amit discovered that the hugetlb implementation in the Linux kernel did not perform TLB flushes under certain conditions. A local attacker could use this to leak or alter data from other processes that use huge pages.(CVE-2021-4002)

Andy Nguyen discovered that the netfilter subsystem in the Linux kernel contained an out-of-bounds write in its setsockopt() implementation. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.(CVE-2021-22555)

It was discovered that the virtual file system implementation in the Linux kernel contained an unsigned to signed integer conversion error. A local attacker could use this to cause a denial of service (system crash) or execute arbitrary code.(CVE-2021-33909)

References
To clipboard 

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    },
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      "ecosystem_specific": {
        "availability": "Livepatch subscription required",
        "module_name_regex": "lkp_Ubuntu_5_4_0[_|\\d]+_gcp_(\\d+)",
        "module_version": "83"
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      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
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        }
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        "5.3.0-1004.4",
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        "availability": "Livepatch subscription required",
        "module_name_regex": "lkp_Ubuntu_5_4_0[_|\\d]+_gke_(\\d+)",
        "module_version": "83"
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
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    {
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        "availability": "Livepatch subscription required",
        "module_name_regex": "lkp_Ubuntu_5_4_0[_|\\d]+_gkeop_(\\d+)",
        "module_version": "83"
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "linux-gkeop",
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        "5.4.0-1021.22",
        "5.4.0-1022.23",
        "5.4.0-1023.24",
        "5.4.0-1024.25",
        "5.4.0-1025.26",
        "5.4.0-1026.27",
        "5.4.0-1027.28"
      ]
    }
  ],
  "aliases": [],
  "details": "The BPF subsystem in the Linux kernel before 4.17 mishandles\nsituations with a long jump over an instruction sequence where inner\ninstructions require substantial expansions into multiple BPF instructions,\nleading to an overflow. This affects kernel/bpf/core.c and\nnet/core/filter.c.(CVE-2018-25020)\n\nMaxim Levitsky discovered that the KVM hypervisor implementation for AMD\nprocessors in the Linux kernel did not properly prevent a guest VM from\nenabling AVIC in nested guest VMs. An attacker in a guest VM could use this\nto write to portions of the host\u0027s physical memory.(CVE-2021-3653)\n\nNadav Amit discovered that the hugetlb implementation in the Linux kernel\ndid not perform TLB flushes under certain conditions. A local attacker\ncould use this to leak or alter data from other processes that use huge\npages.(CVE-2021-4002)\n\nAndy Nguyen discovered that the netfilter subsystem in the Linux kernel\ncontained an out-of-bounds write in its setsockopt() implementation. A\nlocal attacker could use this to cause a denial of service (system crash)\nor possibly execute arbitrary code.(CVE-2021-22555)\n\nIt was discovered that the virtual file system implementation in the Linux\nkernel contained an unsigned to signed integer conversion error. A local\nattacker could use this to cause a denial of service (system crash) or\nexecute arbitrary code.(CVE-2021-33909)",
  "id": "LSN-0083-1",
  "modified": "2026-06-03T10:46:31Z",
  "published": "2022-01-06T08:48:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/LSN-0083-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2018-25020"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-3653"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-4002"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-22555"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-33909"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "Kernel Live Patch Security Notice",
  "upstream": [
    "UBUNTU-CVE-2018-25020",
    "UBUNTU-CVE-2021-3653",
    "UBUNTU-CVE-2021-4002",
    "UBUNTU-CVE-2021-22555",
    "UBUNTU-CVE-2021-33909"
  ]
}



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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

Author Source Type Date Other

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.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

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.