A local privilege escalation was discovered in the Linux kernel before 5.10.13.
Priority LOW 34CWE-667Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- High
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-667 and the CVSS impact.
Summary
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.
Why it matters now
EPSS 0.01602 75th percentileScored 2026-11-07
Fix Fixed Red Hat: 2 advisories
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 12
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 5.5 to before 5.10.13 | Vulnerable | Linux |
| cpe:2.3:a:netapp:aff_baseboard_management_controller:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:a:netapp:fas_baseboard_management_controller:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:a:netapp:solidfire_\&_hci_management_node:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:a:netapp:solidfire_baseboard_management_controller:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | NetApp |
| cpe:2.3:o:netapp:baseboard_management_controller_500f_firmware:*:*:*:*:*:*:*:* | before 15.3 | Vulnerable | NetApp |
| cpe:2.3:h:netapp:500f:-:*:*:*:*:*:*:* | not specified by NVD | Running on | NetApp |
| cpe:2.3:o:netapp:baseboard_management_controller_a250_firmware:*:*:*:*:*:*:*:* | before 15.3 | Vulnerable | NetApp |
| cpe:2.3:h:netapp:a250:-:*:*:*:*:*:*:* | not specified by NVD | Running on | NetApp |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 5.5 to before 5.10.13 Vulnerable ·Linux
- cpe:2.3:a:netapp:aff_baseboard_management_controller:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:a:netapp:fas_baseboard_management_controller:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:a:netapp:solidfire_\&_hci_management_node:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:a:netapp:solidfire_baseboard_management_controller:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·NetApp
- cpe:2.3:o:netapp:baseboard_management_controller_500f_firmware:*:*:*:*:*:*:*:* Versions before 15.3 Vulnerable ·NetApp
- cpe:2.3:h:netapp:500f:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
- cpe:2.3:o:netapp:baseboard_management_controller_a250_firmware:*:*:*:*:*:*:*:* Versions before 15.3 Vulnerable ·NetApp
- cpe:2.3:h:netapp:a250:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·NetApp
Remediation
Red Hat 2 advisories
- RHSA-2021:1093 Released 2021-04-06 · Red Hat rating Importantkernel security, bug fix, and enhancement update
- Red Hat CodeReady Linux Builder (v. 8) kernel-tools-libs-devel-4.18.0-240.22.1.el8_3
- Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-240.22.1.el8_3, kernel-4.18.0-240.22.1.el8_3, kernel-abi-whitelists-4.18.0-240.22.1.el8_3 +19
- RHSA-2021:1081 Released 2021-04-06 · Red Hat rating Importantkernel-rt security and bug fix update
- Red Hat Enterprise Linux Real Time (v. 8) kernel-rt-4.18.0-240.22.1.rt7.77.el8_3, kernel-rt-core-4.18.0-240.22.1.rt7.77.el8_3, kernel-rt-debug-4.18.0-240.22.1.rt7.77.el8_3 +7
- Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt-4.18.0-240.22.1.rt7.77.el8_3, kernel-rt-core-4.18.0-240.22.1.rt7.77.el8_3, kernel-rt-debug-4.18.0-240.22.1.rt7.77.el8_3 +9
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat CodeReady Linux Builder (v. 8) | Fixed | RHSA-2021:1093 |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2021:1093 |
| Red Hat Enterprise Linux Real Time (v. 8) | Fixed | RHSA-2021:1081 |
| Red Hat Enterprise Linux Real Time for NFV (v. 8) | Fixed | RHSA-2021:1081 |
Not affected: 3 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2021-26708
- 2026-10-03 Alias added: GHSA-hhxw-8c9w-q5q9
References
Patch 4
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c518adafa39f37858697ac9309c6cf1805581446
- https://www.openwall.com/lists/oss-security/2021/02/04/5
- [oss-security] 20210205 Re: Linux kernel: Exploitable vulnerabilities in AF_VSOCK implementation
- https://security.netapp.com/advisory/ntap-20210312-0008/
Sources
- CVE-2021-26708 · CVE Program
- CVE-2021-26708 · NVD
- FIRST EPSS
- GHSA-hhxw-8c9w-q5q9 · GitHub Advisory Database · CC BY 4.0
- CVE-2021-26708 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences