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CVE-2025-21898 (GCVE-0-2025-21898)

Vulnerability from cvelistv5 – Published: 2025-04-01 15:26 – Updated: 2026-05-23 15:57
VLAI
Title
ftrace: Avoid potential division by zero in function_stat_show()
Summary
In the Linux kernel, the following vulnerability has been resolved: ftrace: Avoid potential division by zero in function_stat_show() Check whether denominator expression x * (x - 1) * 1000 mod {2^32, 2^64} produce zero and skip stddev computation in that case. For now don't care about rec->counter * rec->counter overflow because rec->time * rec->time overflow will likely happen earlier.
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 2025-10-01 17:18 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f0629ee3922f10112584b1898491fecc74d98b3b , < 5b3d32f607f0478b414b16516cf27f9170cf66c8 (git)
Affected: e31f7939c1c27faa5d0e3f14519eaf7c89e8a69d , < ca381f60a3bb7cfaa618d73ca411610bd7fc3149 (git)
Affected: e31f7939c1c27faa5d0e3f14519eaf7c89e8a69d , < 3d738b53ed6cddb68e68c9874520a4bf846163b5 (git)
Affected: e31f7939c1c27faa5d0e3f14519eaf7c89e8a69d , < 992775227843c9376773784b8b362add44592ad7 (git)
Affected: e31f7939c1c27faa5d0e3f14519eaf7c89e8a69d , < f58a3f8e284d0bdf94164a8e61cd4e70d337a1a3 (git)
Affected: e31f7939c1c27faa5d0e3f14519eaf7c89e8a69d , < 746cc474a95473591853927b3a9792a2d671155b (git)
Affected: e31f7939c1c27faa5d0e3f14519eaf7c89e8a69d , < 9cdac46fa7e854e587eb5f393fe491b6d7a9bdf6 (git)
Affected: e31f7939c1c27faa5d0e3f14519eaf7c89e8a69d , < a1a7eb89ca0b89dc1c326eeee2596f263291aca3 (git)
Affected: c59e74104cfd7df3ca0b5f59f1baee9c8c28b9ef (git)
Affected: 015f0fd0fcc338513f80044add27fa46cf71d217 (git)
Affected: 1a2985af2a20b816a5cc41a2ddc1c4109ef6b9c6 (git)
Affected: 7650b4b1df091815bbbbb837d308dd4154684f8a (git)
Affected: 010a7e846d4beaf34384c40ff18d5de10106d9b4 (git)
Affected: 5.4.9 , < 5.4.291 (semver)
Affected: 3.16.83 , < 3.17 (semver)
Affected: 4.4.209 , < 4.5 (semver)
Affected: 4.9.209 , < 4.10 (semver)
Affected: 4.14.163 , < 4.15 (semver)
Affected: 4.19.94 , < 4.20 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 5.5
Unaffected: 0 , < 5.5 (semver)
Unaffected: 5.4.291 , ≤ 5.4.* (semver)
Unaffected: 5.10.235 , ≤ 5.10.* (semver)
Unaffected: 5.15.179 , ≤ 5.15.* (semver)
Unaffected: 6.1.130 , ≤ 6.1.* (semver)
Unaffected: 6.6.81 , ≤ 6.6.* (semver)
Unaffected: 6.12.18 , ≤ 6.12.* (semver)
Unaffected: 6.13.6 , ≤ 6.13.* (semver)
Unaffected: 6.14 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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                      "versionStartIncluding": "5.5",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.14",
                      "versionStartIncluding": "5.5",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionStartIncluding": "3.16.83",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionStartIncluding": "4.4.209",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionStartIncluding": "4.9.209",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionStartIncluding": "4.14.163",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionStartIncluding": "4.19.94",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nftrace: Avoid potential division by zero in function_stat_show()\n\nCheck whether denominator expression x * (x - 1) * 1000 mod {2^32, 2^64}\nproduce zero and skip stddev computation in that case.\n\nFor now don\u0027t care about rec-\u003ecounter * rec-\u003ecounter overflow because\nrec-\u003etime * rec-\u003etime overflow will likely happen earlier."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-05-11T21:08:39.481Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/5b3d32f607f0478b414b16516cf27f9170cf66c8"
            },
            {
              "url": "https://git.kernel.org/stable/c/ca381f60a3bb7cfaa618d73ca411610bd7fc3149"
            },
            {
              "url": "https://git.kernel.org/stable/c/3d738b53ed6cddb68e68c9874520a4bf846163b5"
            },
            {
              "url": "https://git.kernel.org/stable/c/992775227843c9376773784b8b362add44592ad7"
            },
            {
              "url": "https://git.kernel.org/stable/c/f58a3f8e284d0bdf94164a8e61cd4e70d337a1a3"
            },
            {
              "url": "https://git.kernel.org/stable/c/746cc474a95473591853927b3a9792a2d671155b"
            },
            {
              "url": "https://git.kernel.org/stable/c/9cdac46fa7e854e587eb5f393fe491b6d7a9bdf6"
            },
            {
              "url": "https://git.kernel.org/stable/c/a1a7eb89ca0b89dc1c326eeee2596f263291aca3"
            }
          ],
          "title": "ftrace: Avoid potential division by zero in function_stat_show()",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2025-21898",
        "datePublished": "2025-04-01T15:26:50.211Z",
        "dateReserved": "2024-12-29T08:45:45.783Z",
        "dateUpdated": "2026-05-11T21:08:39.481Z",
        "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.