# CVE-2025-38315: Bluetooth: btintel: Check dsbr size from EFI variable

> A stack buffer overflow in the Linux kernel Bluetooth driver allows local attackers to execute arbitrary code or escalate privileges via a malformed EFI variable.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 10 Jul 2025
- **Updated:** 11 May 2026
- **Also known as:** BELL-CVE-2025-38315, DEBIAN-CVE-2025-38315, GHSA-p9j8-pxcr-cq49, UBUNTU-CVE-2025-38315

## What is CVE-2025-38315?

CVE-2025-38315 is a medium-severity memory corruption vulnerability in Linux kernel, published on 10 Jul 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: btintel: Check dsbr size from EFI variable

Since the size of struct btintel_dsbr is already known, we can just
start there instead of querying the EFI variable size. If the final
result doesn't match what we expect also fail. This fixes a stack buffer
overflow when the EFI variable is larger than struct btintel_dsbr.

Weakness: CWE-674 (Uncontrolled Recursion)

## Which versions are affected by CVE-2025-38315?

It affects 1 product.


Products: Linux kernel.

## How do I fix CVE-2025-38315?

Apply the vendor's patch.

## Is CVE-2025-38315 being exploited?

There is no known exploitation of CVE-2025-38315 in the wild and no public exploit code.

## Other vulnerabilities in Linux kernel

- [CVE-2026-53266](https://insights.sbomify.com/CVE-2026-53266/): Linux Kernel Out-of-Bounds Write (high 8.8, exploited in the wild)
- [CVE-2013-6282](https://insights.sbomify.com/CVE-2013-6282/): Linux Kernel Improper Input Validation (high 8.8, exploited in the wild)
- [CVE-2022-0185](https://insights.sbomify.com/CVE-2022-0185/): Linux Kernel Heap-Based Buffer Overflow (high 8.4, exploited in the wild)
- [CVE-2013-2094](https://insights.sbomify.com/CVE-2013-2094/): Linux Kernel Privilege Escalation (high 8.4, exploited in the wild)
- [CVE-2026-53362](https://insights.sbomify.com/CVE-2026-53362/): Linux Kernel Unspecified (high 7.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-38315 and fix it if it is affected.

What it is: CVE-2025-38315 is a medium-severity memory corruption vulnerability in Linux kernel, published on 10 Jul 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-38315 in the wild and no public exploit code.

Affected product: Linux kernel. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-38315/ (Markdown: https://insights.sbomify.com/CVE-2025-38315/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-38315
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-38315
- OSV: https://osv.dev/vulnerability/CVE-2025-38315

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-38315/
Summaries are generated and may contain mistakes; the official description above is the record.