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CVE-2021-47006 (GCVE-0-2021-47006)

Vulnerability from cvelistv5 – Published: 2024-02-28 08:13 – Updated: 2026-05-11 13:46
VLAI
Title
ARM: 9064/1: hw_breakpoint: Do not directly check the event's overflow_handler hook
Summary
In the Linux kernel, the following vulnerability has been resolved: ARM: 9064/1: hw_breakpoint: Do not directly check the event's overflow_handler hook The commit 1879445dfa7b ("perf/core: Set event's default ::overflow_handler()") set a default event->overflow_handler in perf_event_alloc(), and replace the check event->overflow_handler with is_default_overflow_handler(), but one is missing. Currently, the bp->overflow_handler can not be NULL. As a result, enable_single_step() is always not invoked. Comments from Zhen Lei: https://patchwork.kernel.org/project/linux-arm-kernel/patch/20210207105934.2001-1-thunder.leizhen@huawei.com/
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-02-28 18:46 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1879445dfa7bbd6fe21b09c5cc72f4934798afed , < 555a70f7fff03bd669123487905c47ae27dbdaac (git)
Affected: 1879445dfa7bbd6fe21b09c5cc72f4934798afed , < ed1f67465327cec4457bb988775245b199da86e6 (git)
Affected: 1879445dfa7bbd6fe21b09c5cc72f4934798afed , < a9938d6d78a238d6ab8de57a4d3dcf77adceb9bb (git)
Affected: 1879445dfa7bbd6fe21b09c5cc72f4934798afed , < 3ed8832aeaa9a37b0fc386bb72ff604352567c80 (git)
Affected: 1879445dfa7bbd6fe21b09c5cc72f4934798afed , < 630146203108bf6b8934eec0dfdb3e46dcb917de (git)
Affected: 1879445dfa7bbd6fe21b09c5cc72f4934798afed , < 7eeacc6728c5478e3c01bc82a1f08958eaa12366 (git)
Affected: 1879445dfa7bbd6fe21b09c5cc72f4934798afed , < dabe299425b1a53a69461fed7ac8922ea6733a25 (git)
Affected: 1879445dfa7bbd6fe21b09c5cc72f4934798afed , < a506bd5756290821a4314f502b4bafc2afcf5260 (git)
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Linux Linux Affected: 4.7
Unaffected: 0 , < 4.7 (semver)
Unaffected: 4.9.269 , ≤ 4.9.* (semver)
Unaffected: 4.14.233 , ≤ 4.14.* (semver)
Unaffected: 4.19.191 , ≤ 4.19.* (semver)
Unaffected: 5.4.120 , ≤ 5.4.* (semver)
Unaffected: 5.10.38 , ≤ 5.10.* (semver)
Unaffected: 5.11.22 , ≤ 5.11.* (semver)
Unaffected: 5.12.5 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
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                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.9.269",
                      "versionStartIncluding": "4.7",
                      "vulnerable": true
                    },
                    {
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                      "vulnerable": true
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                      "vulnerable": true
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                    {
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                  "negate": false,
                  "operator": "OR"
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              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nARM: 9064/1: hw_breakpoint: Do not directly check the event\u0027s overflow_handler hook\n\nThe commit 1879445dfa7b (\"perf/core: Set event\u0027s default\n::overflow_handler()\") set a default event-\u003eoverflow_handler in\nperf_event_alloc(), and replace the check event-\u003eoverflow_handler with\nis_default_overflow_handler(), but one is missing.\n\nCurrently, the bp-\u003eoverflow_handler can not be NULL. As a result,\nenable_single_step() is always not invoked.\n\nComments from Zhen Lei:\n\n https://patchwork.kernel.org/project/linux-arm-kernel/patch/20210207105934.2001-1-thunder.leizhen@huawei.com/"
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-05-11T13:46:08.152Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/555a70f7fff03bd669123487905c47ae27dbdaac"
            },
            {
              "url": "https://git.kernel.org/stable/c/ed1f67465327cec4457bb988775245b199da86e6"
            },
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              "url": "https://git.kernel.org/stable/c/a9938d6d78a238d6ab8de57a4d3dcf77adceb9bb"
            },
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              "url": "https://git.kernel.org/stable/c/3ed8832aeaa9a37b0fc386bb72ff604352567c80"
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              "url": "https://git.kernel.org/stable/c/630146203108bf6b8934eec0dfdb3e46dcb917de"
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              "url": "https://git.kernel.org/stable/c/7eeacc6728c5478e3c01bc82a1f08958eaa12366"
            },
            {
              "url": "https://git.kernel.org/stable/c/dabe299425b1a53a69461fed7ac8922ea6733a25"
            },
            {
              "url": "https://git.kernel.org/stable/c/a506bd5756290821a4314f502b4bafc2afcf5260"
            }
          ],
          "title": "ARM: 9064/1: hw_breakpoint: Do not directly check the event\u0027s overflow_handler hook",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2021-47006",
        "datePublished": "2024-02-28T08:13:26.541Z",
        "dateReserved": "2024-02-27T18:42:55.952Z",
        "dateUpdated": "2026-05-11T13:46:08.152Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.