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CVE-2024-56739 (GCVE-0-2024-56739)

Vulnerability from cvelistv5 – Published: 2024-12-29 11:30 – Updated: 2026-05-11 20:58
VLAI
Title
rtc: check if __rtc_read_time was successful in rtc_timer_do_work()
Summary
In the Linux kernel, the following vulnerability has been resolved: rtc: check if __rtc_read_time was successful in rtc_timer_do_work() If the __rtc_read_time call fails,, the struct rtc_time tm; may contain uninitialized data, or an illegal date/time read from the RTC hardware. When calling rtc_tm_to_ktime later, the result may be a very large value (possibly KTIME_MAX). If there are periodic timers in rtc->timerqueue, they will continually expire, may causing kernel softlockup.
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 19:57 UTC
CWE
  • CWE-908 - Use of Uninitialized Resource
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 6610e0893b8bc6f59b14fed7f089c5997f035f88 , < 39ad0a1ae17b54509cd9e93dcd8cec16e7c12d3f (git)
Affected: 6610e0893b8bc6f59b14fed7f089c5997f035f88 , < 44b3257ff705d63d5f00ef8ed314a0eeb7ec37f2 (git)
Affected: 6610e0893b8bc6f59b14fed7f089c5997f035f88 , < 0d68e8514d9040108ff7d1b37ca71096674b6efe (git)
Affected: 6610e0893b8bc6f59b14fed7f089c5997f035f88 , < 246f621d363988e7040f4546d20203dc713fa3e1 (git)
Affected: 6610e0893b8bc6f59b14fed7f089c5997f035f88 , < fde56535505dde3336df438e949ef4742b6d6d6e (git)
Affected: 6610e0893b8bc6f59b14fed7f089c5997f035f88 , < dd4b1cbcc916fad5d10c2662b62def9f05e453d4 (git)
Affected: 6610e0893b8bc6f59b14fed7f089c5997f035f88 , < a1f0b4af90cc18b10261ecde56c6a56b22c75bd1 (git)
Affected: 6610e0893b8bc6f59b14fed7f089c5997f035f88 , < e77bce0a8c3989b4173c36f4195122bca8f4a3e1 (git)
Affected: 6610e0893b8bc6f59b14fed7f089c5997f035f88 , < e8ba8a2bc4f60a1065f23d6a0e7cbea945a0f40d (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.38
Unaffected: 0 , < 2.6.38 (semver)
Unaffected: 4.19.325 , ≤ 4.19.* (semver)
Unaffected: 5.4.287 , ≤ 5.4.* (semver)
Unaffected: 5.10.231 , ≤ 5.10.* (semver)
Unaffected: 5.15.174 , ≤ 5.15.* (semver)
Unaffected: 6.1.120 , ≤ 6.1.* (semver)
Unaffected: 6.6.64 , ≤ 6.6.* (semver)
Unaffected: 6.11.11 , ≤ 6.11.* (semver)
Unaffected: 6.12.2 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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                  "lessThanOrEqual": "5.4.*",
                  "status": "unaffected",
                  "version": "5.4.287",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.231",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.174",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.120",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.64",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.11.*",
                  "status": "unaffected",
                  "version": "6.11.11",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.12.*",
                  "status": "unaffected",
                  "version": "6.12.2",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.13",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.19.325",
                      "versionStartIncluding": "2.6.38",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.4.287",
                      "versionStartIncluding": "2.6.38",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.231",
                      "versionStartIncluding": "2.6.38",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.174",
                      "versionStartIncluding": "2.6.38",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.120",
                      "versionStartIncluding": "2.6.38",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.64",
                      "versionStartIncluding": "2.6.38",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.11.11",
                      "versionStartIncluding": "2.6.38",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.12.2",
                      "versionStartIncluding": "2.6.38",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.13",
                      "versionStartIncluding": "2.6.38",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrtc: check if __rtc_read_time was successful in rtc_timer_do_work()\n\nIf the __rtc_read_time call fails,, the struct rtc_time tm; may contain\nuninitialized data, or an illegal date/time read from the RTC hardware.\n\nWhen calling rtc_tm_to_ktime later, the result may be a very large value\n(possibly KTIME_MAX). If there are periodic timers in rtc-\u003etimerqueue,\nthey will continually expire, may causing kernel softlockup."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-05-11T20:58:10.247Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/39ad0a1ae17b54509cd9e93dcd8cec16e7c12d3f"
            },
            {
              "url": "https://git.kernel.org/stable/c/44b3257ff705d63d5f00ef8ed314a0eeb7ec37f2"
            },
            {
              "url": "https://git.kernel.org/stable/c/0d68e8514d9040108ff7d1b37ca71096674b6efe"
            },
            {
              "url": "https://git.kernel.org/stable/c/246f621d363988e7040f4546d20203dc713fa3e1"
            },
            {
              "url": "https://git.kernel.org/stable/c/fde56535505dde3336df438e949ef4742b6d6d6e"
            },
            {
              "url": "https://git.kernel.org/stable/c/dd4b1cbcc916fad5d10c2662b62def9f05e453d4"
            },
            {
              "url": "https://git.kernel.org/stable/c/a1f0b4af90cc18b10261ecde56c6a56b22c75bd1"
            },
            {
              "url": "https://git.kernel.org/stable/c/e77bce0a8c3989b4173c36f4195122bca8f4a3e1"
            },
            {
              "url": "https://git.kernel.org/stable/c/e8ba8a2bc4f60a1065f23d6a0e7cbea945a0f40d"
            }
          ],
          "title": "rtc: check if __rtc_read_time was successful in rtc_timer_do_work()",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-56739",
        "datePublished": "2024-12-29T11:30:08.512Z",
        "dateReserved": "2024-12-29T11:26:39.757Z",
        "dateUpdated": "2026-05-11T20:58:10.247Z",
        "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.