CVE-2021-3739

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Summary

CVECVE-2021-3739
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2022-03-10 17:43:01 UTC
Updated2026-09-01 18:03:54 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Problem Types: CWE-476 | CWE-476 CWE-476 - NULL Pointer Dereference

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
2.0[email protected]Primary3.6AV:L/AC:L/Au:N/C:P/I:N/A:P

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

CVSS v2.0 Breakdown

Access Vector
Local
Access Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
None
Availability
Partial

AV:L/AC:L/Au:N/C:P/I:N/A:P

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na Kernel affected Fixed in v5.15-rc1 and above. Not specified

References

ReferenceSourceLinkTags
CVE-2021-3739 | Ubuntu af854a3a-2127-422b-91ae-364da2661108 ubuntu.com Third Party Advisory
btrfs: fix NULL pointer dereference when deleting device by invalid id · torvalds/linux@e4571b8 · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Exploit, Patch, Third Party Advisory
1997958 – (CVE-2021-3739) CVE-2021-3739 kernel: null-ptr-dereference bug in btrfs_rm_device in fs/btrfs/volumes.c af854a3a-2127-422b-91ae-364da2661108 bugzilla.redhat.com Issue Tracking, Patch, Third Party Advisory
oss-security - Linux kernel: fs/btrfs: null-ptr-dereference bug in btrfs_rm_device in fs/btrfs/volumes.c af854a3a-2127-422b-91ae-364da2661108 www.openwall.com Mailing List, Patch, Third Party Advisory
kernel/git/torvalds/linux.git - Linux kernel source tree af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Mailing List, Patch, Vendor Advisory
CVE-2021-3739 Linux Kernel Vulnerability in NetApp Products | NetApp Product Security af854a3a-2127-422b-91ae-364da2661108 security.netapp.com Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 159401 Oracle Enterprise Linux Security Update for Unbreakable Enterprise kernel (ELSA-2021-9457)
  • 159405 Oracle Enterprise Linux Security Update for Unbreakable Enterprise kernel-container (ELSA-2021-9461)
  • 159421 Oracle Enterprise Linux Security Update for Unbreakable Enterprise kernel (ELSA-2021-9474)
  • 159422 Oracle Enterprise Linux Security Update for Unbreakable Enterprise kernel-container (ELSA-2021-9475)
  • 178809 Debian Security Update for linux (DSA 4978-1)
  • 182052 Debian Security Update for linux (CVE-2021-3739)
  • 198540 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-5113-1)
  • 198542 Ubuntu Security Notification for Linux kernel (OEM) Vulnerabilities (USN-5115-1)
  • 198543 Ubuntu Security Notification for Linux kernel (OEM) Vulnerabilities (USN-5117-1)
  • 198563 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-5137-1)
  • 198565 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-5137-2)
  • 353155 Amazon Linux Security Advisory for kernel : ALAS2KERNEL-5.10-2022-005
  • 6140414 AWS Bottlerocket Security Update for kernel (GHSA-mgpp-7p6c-ph3c)
  • 751137 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:1271-1)
  • 751160 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:3179-1)
  • 751170 OpenSUSE Security Update for the Linux Kernel (openSUSE-SU-2021:3205-1)
  • 900740 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (8936)
  • 905812 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (8936-1)

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