CVE-2021-3739 (GCVE-0-2021-3739)

Vulnerability from cvelistv5 – Published: 2022-03-07 15:19 – Updated: 2024-08-03 17:01
VLAI
Summary
A NULL pointer dereference flaw was found in the btrfs_rm_device function in fs/btrfs/volumes.c in the Linux Kernel, where triggering the bug requires ‘CAP_SYS_ADMIN’. This flaw allows a local attacker to crash the system or leak kernel internal information. The highest threat from this vulnerability is to system availability.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CWE
  • CWE-476 - - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
n/a kernel Affected: Fixed in v5.15-rc1 and above.
Show details on NVD website
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2025-11-21T16:13:51+00:00",
      "cve": "CVE-2021-3739",
      "id": "CVE-2021-3739",
      "initial_release_date": "2021-08-06T00:00:00+00:00",
      "product_status:known_not_affected": "197",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: null-ptr-dereference bug in btrfs_rm_device in fs/btrfs/volumes.c",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-3739.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-05-27T05:40:44Z",
      "cve": "CVE-2021-3739",
      "id": "CVE-2021-3739",
      "initial_release_date": "2024-06-04T13:03:12Z",
      "product_status:known_affected": "297",
      "product_status:known_not_affected": "199",
      "product_status:recommended": "1018",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-3739",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-3739.json",
      "version": "38"
    }
  }
}



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Taxonomy of the tags.





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.