CVE-2021-3736
MEDIUMCVSS 5.5/10EPSS 0.24%
Last modified
CVE-2021-3736 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. A flaw was found in the Linux kernel. A memory leak problem was found in mbochs_ioctl in samples/vfio-mdev/mbochs.c in Virtual Function I/O (VFIO) Mediated devices. EPSS estimates a 0.24% chance of exploitation in the next 30 days.
Description
A flaw was found in the Linux kernel. A memory leak problem was found in mbochs_ioctl in samples/vfio-mdev/mbochs.c in Virtual Function I/O (VFIO) Mediated devices. This flaw could allow a local attacker to leak internal kernel information.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | <= 5.14.20 |
References
- https://access.redhat.com/security/cve/CVE-2021-3736Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1995570Issue Tracking, Third Party Advisory
- https://github.com/torvalds/linux/commit/de5494af4815a4c9328536c72741229b7de88e7fPatch, Third Party Advisory
- https://access.redhat.com/security/cve/CVE-2021-3736Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1995570Issue Tracking, Third Party Advisory
- https://github.com/torvalds/linux/commit/de5494af4815a4c9328536c72741229b7de88e7fPatch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-3736?
A flaw was found in the Linux kernel. A memory leak problem was found in mbochs_ioctl in samples/vfio-mdev/mbochs.c in Virtual Function I/O (VFIO) Mediated devices. This flaw could allow a local attacker to leak internal kernel information.
How severe is CVE-2021-3736?
CVE-2021-3736 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.24% probability of exploitation in the next 30 days.
How do I fix CVE-2021-3736?
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.
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Are you affected by CVE-2021-3736?
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Scan your code nowSource: NVD / NIST