Vulnerability Details : CVE-2021-3739
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.
Vulnerability category: Memory Corruption
Products affected by CVE-2021-3739
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
- cpe:2.3:o:netapp:h410c_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:netapp:h300s_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:netapp:h500s_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:netapp:h700s_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:netapp:h300e_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:netapp:h500e_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:netapp:h700e_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:netapp:h410s_firmware:-:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-3739
0.04%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 6 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-3739
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
3.6
|
LOW | AV:L/AC:L/Au:N/C:P/I:N/A:P |
3.9
|
4.9
|
NIST | |
|
7.1
|
HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H |
1.8
|
5.2
|
NIST |
CWE ids for CVE-2021-3739
-
The product dereferences a pointer that it expects to be valid but is NULL.Assigned by:
- nvd@nist.gov (Primary)
- secalert@redhat.com (Secondary)
References for CVE-2021-3739
-
https://github.com/torvalds/linux/commit/e4571b8c5e9ffa1e85c0c671995bd4dcc5c75091
btrfs: fix NULL pointer dereference when deleting device by invalid id · torvalds/linux@e4571b8 · GitHubExploit;Patch;Third Party Advisory
-
https://ubuntu.com/security/CVE-2021-3739
CVE-2021-3739 | UbuntuThird Party Advisory
-
https://security.netapp.com/advisory/ntap-20220407-0006/
CVE-2021-3739 Linux Kernel Vulnerability in NetApp Products | NetApp Product SecurityThird Party Advisory
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https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e4571b8c5e9ffa1e85c0c671995bd4dcc5c75091
kernel/git/torvalds/linux.git - Linux kernel source treeMailing List;Patch;Vendor Advisory
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https://www.openwall.com/lists/oss-security/2021/08/25/3
oss-security - Linux kernel: fs/btrfs: null-ptr-dereference bug in btrfs_rm_device in fs/btrfs/volumes.cMailing List;Patch;Third Party Advisory
-
https://bugzilla.redhat.com/show_bug.cgi?id=1997958
1997958 – (CVE-2021-3739) CVE-2021-3739 kernel: null-ptr-dereference bug in btrfs_rm_device in fs/btrfs/volumes.cIssue Tracking;Patch;Third Party Advisory
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