# CVE-2008-4307: Race condition in n/a

> Local attackers can crash the Linux kernel via a race condition in NFS file locking, requiring kernel upgrades to mitigate.

- **Severity:** Medium 4.0 (`AV:L/AC:H/Au:N/C:N/I:N/A:C`)
- **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:** 13 Jan 2009
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-rjfh-5x67-p59h

## What is CVE-2008-4307?

CVE-2008-4307 is a medium-severity vulnerability in Linux kernel, published on 13 Jan 2009. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Race condition in the do_setlk function in fs/nfs/file.c in the Linux kernel before 2.6.26 allows local users to cause a denial of service (crash) via vectors resulting in an interrupted RPC call that leads to a stray FL_POSIX lock, related to improper handling of a race between fcntl and close in the EINTR case.

Weakness: CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization)

## Which versions are affected by CVE-2008-4307?

It affects 1 product.


Products: Linux kernel.

## How do I fix CVE-2008-4307?

Upgrade to a fixed version.

## Is CVE-2008-4307 being exploited?

There is no known exploitation of CVE-2008-4307 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-2008-4307 and fix it if it is affected.

What it is: CVE-2008-4307 is a medium-severity vulnerability in Linux kernel, published on 13 Jan 2009. 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-2008-4307 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-2008-4307/ (Markdown: https://insights.sbomify.com/CVE-2008-4307/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2008-4307
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2008-4307
- OSV: https://osv.dev/vulnerability/CVE-2008-4307

---
From sbomify Insights: https://insights.sbomify.com/CVE-2008-4307/
Summaries are generated and may contain mistakes; the official description above is the record.