What’s Vulnerable › Vulnerabilities

CVE-2021-26708

• Severity: high (CVSS 7.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-02-05 · updated 2026-06-17
• Weakness: CWE-667

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.

Affected products

• Linux kernel: from 5.5 before 5.10.13 — fixed in 5.10.13
• NetApp Aff Baseboard Management Controller: all versions
• NetApp Baseboard Management Controller 500F Firmware: before 15.3 — fixed in 15.3
• NetApp Baseboard Management Controller A250 Firmware: before 15.3 — fixed in 15.3
• NetApp Cloud Backup: all versions
• NetApp Fas Baseboard Management Controller: all versions
• NetApp Hci H410C Firmware: all versions
• NetApp Solidfire & Hci Management Node: all versions
• NetApp Solidfire Baseboard Management Controller: all versions

How to fix

Upgrade to a fixed version: Linux kernel 5.10.13; NetApp Baseboard Management Controller 500F Firmware 15.3; NetApp Baseboard Management Controller A250 Firmware 15.3. Check the vendor advisory for mitigations.

References

• http://www.openwall.com/lists/oss-security/2021/02/05/6
• http://www.openwall.com/lists/oss-security/2021/04/09/2
• http://www.openwall.com/lists/oss-security/2022/01/25/14
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.13
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c518adafa39f37858697ac9309c6cf1805581446
• https://security.netapp.com/advisory/ntap-20210312-0008/
• https://www.openwall.com/lists/oss-security/2021/02/04/5
• http://www.openwall.com/lists/oss-security/2021/02/05/6
• http://www.openwall.com/lists/oss-security/2021/04/09/2
• http://www.openwall.com/lists/oss-security/2022/01/25/14
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.13
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c518adafa39f37858697ac9309c6cf1805581446

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