Vulnerability-Lookup

BDU:2024-06286

Vulnerability from fstec - Published: 31.12.2021

Title

Уязвимость функции dbgfs_target_ids_write() в компоненте dbgfs ядра операционной системы Linux, позволяющая нарушителю раскрыть защищаемую информацию

Description

Уязвимость функции dbgfs_target_ids_write() в компоненте dbgfs ядра операционной системы Linux связана с arget_ids многократной записью target_ids без запуска/завершения мониторинга DAMON, количество ссылок не уменьшается, память для struct pid не может быть освобождена. Эксплуатация уязвимости может позволить нарушителю раскрыть защищаемую информацию

Severity


                    
                      AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Vendor

ООО «Ред Софт», Сообщество свободного программного обеспечения

Software Name

РЕД ОС (запись в едином реестре российских программ №3751), Linux

Software Version

7.3 (РЕД ОС), от 5.15.0 до 5.15.12 включительно (Linux)

Possible Mitigations

Для Linux: https://git.kernel.org/stable/c/ebb3f994dd92f8fb4d70c7541091216c1e10cb71 https://git.kernel.org/stable/c/ffe4a1ba1a82c416a6b3a09d46594f6a885ae141 Для РедОС: http://repo.red-soft.ru/redos/7.3c/x86_64/updates/

Reference

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-46937 https://git.kernel.org/linus/ebb3f994dd92f8fb4d70c7541091216c1e10cb71 https://git.kernel.org/stable/c/ebb3f994dd92f8fb4d70c7541091216c1e10cb71 https://git.kernel.org/stable/c/ffe4a1ba1a82c416a6b3a09d46594f6a885ae141 https://kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.13 https://lore.kernel.org/linux-cve-announce/2024022751-CVE-2021-46937-3ae8@gregkh/T/#u https://redos.red-soft.ru/support/secure/ https://www.cve.org/CVERecord?id=CVE-2021-46937

CWE

CWE-668

JSON

To clipboard

{
  "CVSS 2.0": "AV:L/AC:L/Au:S/C:C/I:N/A:N",
  "CVSS 3.0": "AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
  "CVSS 4.0": null,
  "remediation_\u0418\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440": null,
  "remediation_\u041d\u0430\u0438\u043c\u0435\u043d\u043e\u0432\u0430\u043d\u0438\u0435": null,
  "\u0412\u0435\u043d\u0434\u043e\u0440 \u041f\u041e": "\u041e\u041e\u041e \u00ab\u0420\u0435\u0434 \u0421\u043e\u0444\u0442\u00bb, \u0421\u043e\u043e\u0431\u0449\u0435\u0441\u0442\u0432\u043e \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0433\u043e \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0433\u043e \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f",
  "\u0412\u0435\u0440\u0441\u0438\u044f \u041f\u041e": "7.3 (\u0420\u0415\u0414 \u041e\u0421), \u043e\u0442 5.15.0 \u0434\u043e 5.15.12 \u0432\u043a\u043b\u044e\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e (Linux)",
  "\u0412\u043e\u0437\u043c\u043e\u0436\u043d\u044b\u0435 \u043c\u0435\u0440\u044b \u043f\u043e \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u044e": "\u0414\u043b\u044f Linux:\nhttps://git.kernel.org/stable/c/ebb3f994dd92f8fb4d70c7541091216c1e10cb71 \nhttps://git.kernel.org/stable/c/ffe4a1ba1a82c416a6b3a09d46594f6a885ae141\n\n\u0414\u043b\u044f \u0420\u0435\u0434\u041e\u0421: http://repo.red-soft.ru/redos/7.3c/x86_64/updates/",
  "\u0414\u0430\u0442\u0430 \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0438\u044f": "31.12.2021",
  "\u0414\u0430\u0442\u0430 \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0435\u0433\u043e \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f": "10.10.2024",
  "\u0414\u0430\u0442\u0430 \u043f\u0443\u0431\u043b\u0438\u043a\u0430\u0446\u0438\u0438": "19.08.2024",
  "\u0418\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440": "BDU:2024-06286",
  "\u0418\u0434\u0435\u043d\u0442\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440\u044b \u0434\u0440\u0443\u0433\u0438\u0445 \u0441\u0438\u0441\u0442\u0435\u043c \u043e\u043f\u0438\u0441\u0430\u043d\u0438\u0439 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "CVE-2021-46937",
  "\u0418\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f \u043e\u0431 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0438": "\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430",
  "\u041a\u043b\u0430\u0441\u0441 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u043a\u043e\u0434\u0430",
  "\u041d\u0430\u0437\u0432\u0430\u043d\u0438\u0435 \u041f\u041e": "\u0420\u0415\u0414 \u041e\u0421 (\u0437\u0430\u043f\u0438\u0441\u044c \u0432 \u0435\u0434\u0438\u043d\u043e\u043c \u0440\u0435\u0435\u0441\u0442\u0440\u0435 \u0440\u043e\u0441\u0441\u0438\u0439\u0441\u043a\u0438\u0445 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c \u21163751), Linux",
  "\u041d\u0430\u0438\u043c\u0435\u043d\u043e\u0432\u0430\u043d\u0438\u0435 \u041e\u0421 \u0438 \u0442\u0438\u043f \u0430\u043f\u043f\u0430\u0440\u0430\u0442\u043d\u043e\u0439 \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c\u044b": "\u041e\u041e\u041e \u00ab\u0420\u0435\u0434 \u0421\u043e\u0444\u0442\u00bb \u0420\u0415\u0414 \u041e\u0421 7.3  (\u0437\u0430\u043f\u0438\u0441\u044c \u0432 \u0435\u0434\u0438\u043d\u043e\u043c \u0440\u0435\u0435\u0441\u0442\u0440\u0435 \u0440\u043e\u0441\u0441\u0438\u0439\u0441\u043a\u0438\u0445 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c \u21163751), \u0421\u043e\u043e\u0431\u0449\u0435\u0441\u0442\u0432\u043e \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0433\u043e \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0433\u043e \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f Linux \u043e\u0442 5.15.0 \u0434\u043e 5.15.13 ",
  "\u041d\u0430\u0438\u043c\u0435\u043d\u043e\u0432\u0430\u043d\u0438\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0444\u0443\u043d\u043a\u0446\u0438\u0438 dbgfs_target_ids_write() \u0432 \u043a\u043e\u043c\u043f\u043e\u043d\u0435\u043d\u0442\u0435 dbgfs \u044f\u0434\u0440\u0430 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b Linux, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0430\u044f \u043d\u0430\u0440\u0443\u0448\u0438\u0442\u0435\u043b\u044e \u0440\u0430\u0441\u043a\u0440\u044b\u0442\u044c \u0437\u0430\u0449\u0438\u0449\u0430\u0435\u043c\u0443\u044e \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044e",
  "\u041d\u0430\u043b\u0438\u0447\u0438\u0435 \u044d\u043a\u0441\u043f\u043b\u043e\u0439\u0442\u0430": "\u0414\u0430\u043d\u043d\u044b\u0435 \u0443\u0442\u043e\u0447\u043d\u044f\u044e\u0442\u0441\u044f",
  "\u041e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 \u043e\u0448\u0438\u0431\u043a\u0438 CWE": "\u0420\u0430\u0441\u043a\u0440\u044b\u0442\u0438\u0435 \u0440\u0435\u0441\u0443\u0440\u0441\u0430 \u0434\u043b\u044f \u043e\u0448\u0438\u0431\u043e\u0447\u043d\u043e\u0439 \u043e\u0431\u043b\u0430\u0441\u0442\u0438 (CWE-668)",
  "\u041e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u0423\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c \u0444\u0443\u043d\u043a\u0446\u0438\u0438 dbgfs_target_ids_write() \u0432 \u043a\u043e\u043c\u043f\u043e\u043d\u0435\u043d\u0442\u0435 dbgfs \u044f\u0434\u0440\u0430 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b Linux \u0441\u0432\u044f\u0437\u0430\u043d\u0430 \u0441 arget_ids \u043c\u043d\u043e\u0433\u043e\u043a\u0440\u0430\u0442\u043d\u043e\u0439 \u0437\u0430\u043f\u0438\u0441\u044c\u044e target_ids \u0431\u0435\u0437 \u0437\u0430\u043f\u0443\u0441\u043a\u0430/\u0437\u0430\u0432\u0435\u0440\u0448\u0435\u043d\u0438\u044f \u043c\u043e\u043d\u0438\u0442\u043e\u0440\u0438\u043d\u0433\u0430 DAMON, \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e \u0441\u0441\u044b\u043b\u043e\u043a \u043d\u0435 \u0443\u043c\u0435\u043d\u044c\u0448\u0430\u0435\u0442\u0441\u044f, \u043f\u0430\u043c\u044f\u0442\u044c \u0434\u043b\u044f struct pid \u043d\u0435 \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u043e\u0441\u0432\u043e\u0431\u043e\u0436\u0434\u0435\u043d\u0430. \u042d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438 \u043c\u043e\u0436\u0435\u0442 \u043f\u043e\u0437\u0432\u043e\u043b\u0438\u0442\u044c \u043d\u0430\u0440\u0443\u0448\u0438\u0442\u0435\u043b\u044e \u0440\u0430\u0441\u043a\u0440\u044b\u0442\u044c \u0437\u0430\u0449\u0438\u0449\u0430\u0435\u043c\u0443\u044e \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044e",
  "\u041f\u043e\u0441\u043b\u0435\u0434\u0441\u0442\u0432\u0438\u044f \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": null,
  "\u041f\u0440\u043e\u0447\u0430\u044f \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f": null,
  "\u0421\u0432\u044f\u0437\u044c \u0441 \u0438\u043d\u0446\u0438\u0434\u0435\u043d\u0442\u0430\u043c\u0438 \u0418\u0411": "\u0414\u0430\u043d\u043d\u044b\u0435 \u0443\u0442\u043e\u0447\u043d\u044f\u044e\u0442\u0441\u044f",
  "\u0421\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u0430",
  "\u0421\u043f\u043e\u0441\u043e\u0431 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u044f": "\u041e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u043d\u043e\u0433\u043e \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f",
  "\u0421\u043f\u043e\u0441\u043e\u0431 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438": "\u041d\u0430\u0440\u0443\u0448\u0435\u043d\u0438\u0435 \u0430\u0432\u0442\u043e\u0440\u0438\u0437\u0430\u0446\u0438\u0438, \u041c\u0430\u043d\u0438\u043f\u0443\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u0440\u0435\u0441\u0443\u0440\u0441\u0430\u043c\u0438",
  "\u0421\u0441\u044b\u043b\u043a\u0438 \u043d\u0430 \u0438\u0441\u0442\u043e\u0447\u043d\u0438\u043a\u0438": "https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-46937\nhttps://git.kernel.org/linus/ebb3f994dd92f8fb4d70c7541091216c1e10cb71\nhttps://git.kernel.org/stable/c/ebb3f994dd92f8fb4d70c7541091216c1e10cb71\nhttps://git.kernel.org/stable/c/ffe4a1ba1a82c416a6b3a09d46594f6a885ae141\nhttps://kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.13\nhttps://lore.kernel.org/linux-cve-announce/2024022751-CVE-2021-46937-3ae8@gregkh/T/#u\nhttps://redos.red-soft.ru/support/secure/\nhttps://www.cve.org/CVERecord?id=CVE-2021-46937",
  "\u0421\u0442\u0430\u0442\u0443\u0441 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u041f\u043e\u0434\u0442\u0432\u0435\u0440\u0436\u0434\u0435\u043d\u0430 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u0435\u043c",
  "\u0422\u0438\u043f \u041f\u041e": "\u041e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u0430\u044f \u0441\u0438\u0441\u0442\u0435\u043c\u0430",
  "\u0422\u0438\u043f \u043e\u0448\u0438\u0431\u043a\u0438 CWE": "CWE-668",
  "\u0423\u0440\u043e\u0432\u0435\u043d\u044c \u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u0438": "\u0421\u0440\u0435\u0434\u043d\u0438\u0439 \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 (\u0431\u0430\u0437\u043e\u0432\u0430\u044f \u043e\u0446\u0435\u043d\u043a\u0430 CVSS 2.0 \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 4,6)\n\u0421\u0440\u0435\u0434\u043d\u0438\u0439 \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u043e\u043f\u0430\u0441\u043d\u043e\u0441\u0442\u0438 (\u0431\u0430\u0437\u043e\u0432\u0430\u044f \u043e\u0446\u0435\u043d\u043a\u0430 CVSS 3.0 \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 5,5)"
}

CVE-2021-46937 (GCVE-0-2021-46937)

Vulnerability from cvelistv5 – Published: 2024-02-27 09:44 – Updated: 2026-05-11 13:44

Title

mm/damon/dbgfs: fix 'struct pid' leaks in 'dbgfs_target_ids_write()'

Summary

In the Linux kernel, the following vulnerability has been resolved: mm/damon/dbgfs: fix 'struct pid' leaks in 'dbgfs_target_ids_write()' DAMON debugfs interface increases the reference counts of 'struct pid's for targets from the 'target_ids' file write callback ('dbgfs_target_ids_write()'), but decreases the counts only in DAMON monitoring termination callback ('dbgfs_before_terminate()'). Therefore, when 'target_ids' file is repeatedly written without DAMON monitoring start/termination, the reference count is not decreased and therefore memory for the 'struct pid' cannot be freed. This commit fixes this issue by decreasing the reference counts when 'target_ids' is written.

Severity

No CVSS data available.

Assigner

Linux

References

2 references

URL	Tags
https://git.kernel.org/stable/c/ffe4a1ba1a82c416a…
https://git.kernel.org/stable/c/ebb3f994dd92f8fb4…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 4bc05954d0076655cfaf6f0135585bdc20cd6b11 , < ffe4a1ba1a82c416a6b3a09d46594f6a885ae141 (git) Affected: 4bc05954d0076655cfaf6f0135585bdc20cd6b11 , < ebb3f994dd92f8fb4d70c7541091216c1e10cb71 (git)
Linux	Linux	Affected: 5.15 Unaffected: 0 , < 5.15 (semver) Unaffected: 5.15.13 , ≤ 5.15.* (semver) Unaffected: 5.16 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2021-46937",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-02-27T15:48:08.860920Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-07-05T17:22:00.927Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
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            "url": "https://git.kernel.org/stable/c/ebb3f994dd92f8fb4d70c7541091216c1e10cb71"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/damon/dbgfs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "lessThan": "ffe4a1ba1a82c416a6b3a09d46594f6a885ae141",
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              "version": "5.15.13",
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              "status": "unaffected",
              "version": "5.16",
              "versionType": "original_commit_for_fix"
            }
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/dbgfs: fix \u0027struct pid\u0027 leaks in \u0027dbgfs_target_ids_write()\u0027\n\nDAMON debugfs interface increases the reference counts of \u0027struct pid\u0027s\nfor targets from the \u0027target_ids\u0027 file write callback\n(\u0027dbgfs_target_ids_write()\u0027), but decreases the counts only in DAMON\nmonitoring termination callback (\u0027dbgfs_before_terminate()\u0027).\n\nTherefore, when \u0027target_ids\u0027 file is repeatedly written without DAMON\nmonitoring start/termination, the reference count is not decreased and\ntherefore memory for the \u0027struct pid\u0027 cannot be freed.  This commit\nfixes this issue by decreasing the reference counts when \u0027target_ids\u0027 is\nwritten."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T13:44:47.438Z",
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          "url": "https://git.kernel.org/stable/c/ebb3f994dd92f8fb4d70c7541091216c1e10cb71"
        }
      ],
      "title": "mm/damon/dbgfs: fix \u0027struct pid\u0027 leaks in \u0027dbgfs_target_ids_write()\u0027",
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      }
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-46937",
    "datePublished": "2024-02-27T09:44:03.421Z",
    "dateReserved": "2024-02-25T13:45:52.721Z",
    "dateUpdated": "2026-05-11T13:44:47.438Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Action not permitted

BDU:2024-06286

CVE-2021-46937 (GCVE-0-2021-46937)

Tags

Sightings

Nomenclature