CVE-2021-26708
HIGHCVSS 7/10EPSS 1.60%
Last modified
CVE-2021-26708 is a high-severity vulnerability rated 7/10 on the CVSS scale. A local privilege escalation was discovered in the Linux kernel before 5.10.13. Multiple race conditions in the AF_VSOCK implementation are caused by wrong locking in net/vmw_vsock/af_vsock.c. EPSS estimates a 1.60% chance of exploitation in the next 30 days.
Description
A local privilege escalation was discovered in the Linux kernel before 5.10.13. Multiple race conditions in the AF_VSOCK implementation are caused by wrong locking in net/vmw_vsock/af_vsock.c. The race conditions were implicitly introduced in the commits that added VSOCK multi-transport support.
Metrics
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 5.5, < 5.10.13 |
| Netapp | Aff Baseboard Management Controller | All versions |
| Netapp | Cloud Backup | All versions |
| Netapp | Fas Baseboard Management Controller | All versions |
| Netapp | Solidfire \& Hci Management Node | All versions |
| Netapp | Solidfire Baseboard Management Controller | All versions |
| Netapp | Baseboard Management Controller 500f Firmware | < 15.3 |
| Netapp | Baseboard Management Controller A250 Firmware | < 15.3 |
| Netapp | Hci H410c Firmware | All versions |
References
- http://www.openwall.com/lists/oss-security/2021/02/05/6Mailing List, Patch, Third Party Advisory
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.13Release Notes, Vendor Advisory
- https://security.netapp.com/advisory/ntap-20210312-0008/Patch, Third Party Advisory
- https://www.openwall.com/lists/oss-security/2021/02/04/5Mailing List, Patch, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2021/02/05/6Mailing List, Patch, Third Party Advisory
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.13Release Notes, Vendor Advisory
- https://security.netapp.com/advisory/ntap-20210312-0008/Patch, Third Party Advisory
- https://www.openwall.com/lists/oss-security/2021/02/04/5Mailing List, Patch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-26708?
A local privilege escalation was discovered in the Linux kernel before 5.10.13. Multiple race conditions in the AF_VSOCK implementation are caused by wrong locking in net/vmw_vsock/af_vsock.c. The race conditions were implicitly introduced in the commits that added VSOCK multi-transport support.
How severe is CVE-2021-26708?
CVE-2021-26708 has a CVSS score of 7/10 (HIGH severity). The EPSS model estimates a 1.60% probability of exploitation in the next 30 days.
How do I fix CVE-2021-26708?
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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