CVE-2021-3739
HIGHCVSS 7.1/10EPSS 0.58%
Last modified
CVE-2021-3739 is a high-severity vulnerability rated 7.1/10 on the CVSS scale. 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. EPSS estimates a 0.58% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | <= 5.14.20 |
| Fedoraproject | Fedora | 34 |
| Netapp | H300s Firmware | All versions |
| Netapp | H500s Firmware | All versions |
| Netapp | H700s Firmware | All versions |
| Netapp | H300e Firmware | All versions |
| Netapp | H500e Firmware | All versions |
| Netapp | H700e Firmware | All versions |
| Netapp | H410s Firmware | All versions |
| Netapp | H410c Firmware | All versions |
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1997958Issue Tracking, Patch, Third Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e4571b8c5e9ffa1e85c0c671995bd4dcc5c75091Mailing List, Patch, Vendor Advisory
- https://github.com/torvalds/linux/commit/e4571b8c5e9ffa1e85c0c671995bd4dcc5c75091Exploit, Patch, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20220407-0006/Third Party Advisory
- https://ubuntu.com/security/CVE-2021-3739Third Party Advisory
- https://www.openwall.com/lists/oss-security/2021/08/25/3Mailing List, Patch, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1997958Issue Tracking, Patch, Third Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e4571b8c5e9ffa1e85c0c671995bd4dcc5c75091Mailing List, Patch, Vendor Advisory
- https://github.com/torvalds/linux/commit/e4571b8c5e9ffa1e85c0c671995bd4dcc5c75091Exploit, Patch, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20220407-0006/Third Party Advisory
- https://ubuntu.com/security/CVE-2021-3739Third Party Advisory
- https://www.openwall.com/lists/oss-security/2021/08/25/3Mailing List, Patch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is 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.
How severe is CVE-2021-3739?
CVE-2021-3739 has a CVSS score of 7.1/10 (HIGH severity). The EPSS model estimates a 0.58% probability of exploitation in the next 30 days.
How do I fix CVE-2021-3739?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2021
- CVE-2021-3738In DCE/RPC it is possible to share the handles (cookies for …8.8
- CVE-2021-37381Southsoft GMIS 5.0 is vulnerable to CSRF attacks. Attackers …8.8
- CVE-2021-37384RCE (Remote Code Execution) vulnerability was found in some …9.8
- CVE-2021-37386Furukawa Electric LatAm 423-41W/AC before v1.1.4 and LD421-2…7.5
- CVE-2021-37388A buffer overflow in D-Link DIR-615 C2 3.03WW. The ping_ipad…9.8
- CVE-2021-37389Chamilo 1.11.14 allows stored XSS via main/install/index.php…6.1
- CVE-2021-37390A Chamilo LMS 1.11.14 reflected XSS vulnerability exists in …6.1
- CVE-2021-37391A user without privileges in Chamilo LMS 1.11.14 can send an…5.4
- CVE-2021-37392In RPCMS v1.8 and below, the "nickname" variable is not prop…5.4
- CVE-2021-37393In RPCMS v1.8 and below, the "nickname" variable is not prop…5.4
- CVE-2021-37394In RPCMS v1.8 and below, attackers can interact with API and…8.8
- CVE-2021-3740A Session Fixation vulnerability exists in chatwoot/chatwoot…6.8
Are you affected by CVE-2021-3739?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST