# CVE-2010-1636: Information disclosure in n/a

> Local attackers can read sensitive data from write-only files via a flaw in the btrfs clone ioctl, affecting Linux kernel users.

- **Severity:** Low 2.1 (`AV:L/AC:L/Au:N/C:P/I:N/A:N`)
- **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:** No
- **Published:** 7 Jun 2010
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-5c4j-r3xw-v7jr

## What is CVE-2010-1636?

CVE-2010-1636 is a low-severity vulnerability in Linux kernel, published on 7 Jun 2010. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

The btrfs_ioctl_clone function in fs/btrfs/ioctl.c in the btrfs functionality in the Linux kernel 2.6.29 through 2.6.32, and possibly other versions, does not ensure that a cloned file descriptor has been opened for reading, which allows local users to read sensitive information from a write-only file descriptor.

Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2010-1636?

It affects 1 product.


Products: Linux kernel.

## How do I fix CVE-2010-1636?

No fix has been published for CVE-2010-1636 yet. Limit exposure of the affected software until one is available.

## Is CVE-2010-1636 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2010-1636 exists.

Public exploit code:

- Linux Kernel 2.6.x - Btrfs Cloned File Security Bypass (exploitdb)

## 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-2010-1636 and fix it if it is affected.

What it is: CVE-2010-1636 is a low-severity vulnerability in Linux kernel, published on 7 Jun 2010. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2010-1636 exists.

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-2010-1636/ (Markdown: https://insights.sbomify.com/CVE-2010-1636/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2010-1636
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2010-1636
- OSV: https://osv.dev/vulnerability/CVE-2010-1636

---
From sbomify Insights: https://insights.sbomify.com/CVE-2010-1636/
Summaries are generated and may contain mistakes; the official description above is the record.