# CVE-2015-8952: Denial of service in n/a

> Local users can cause a denial of service via soft lockup in Linux kernel ext2/ext4 filesystems by exploiting mbcache xattr block caching mishandling.

- **Severity:** Medium 5.5 (`CVSS:3.0/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:** 16 Oct 2016
- **Updated:** 6 Aug 2024
- **Also known as:** DEBIAN-CVE-2015-8952, GHSA-r248-wpg2-5hw4, UBUNTU-CVE-2015-8952

## What is CVE-2015-8952?

CVE-2015-8952 is a medium-severity denial of service vulnerability in Linux kernel, published on 16 Oct 2016. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

The mbcache feature in the ext2 and ext4 filesystem implementations in the Linux kernel before 4.6 mishandles xattr block caching, which allows local users to cause a denial of service (soft lockup) via filesystem operations in environments that use many attributes, as demonstrated by Ceph and Samba.

Weakness: CWE-19

## Which versions are affected by CVE-2015-8952?

It affects 1 product.


Products: Linux kernel.

## How do I fix CVE-2015-8952?

Upgrade to a fixed version.

## Is CVE-2015-8952 being exploited?

There is no known exploitation of CVE-2015-8952 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-2015-8952 and fix it if it is affected.

What it is: CVE-2015-8952 is a medium-severity denial of service vulnerability in Linux kernel, published on 16 Oct 2016. 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-2015-8952 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-2015-8952/ (Markdown: https://insights.sbomify.com/CVE-2015-8952/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2015-8952
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2015-8952
- OSV: https://osv.dev/vulnerability/CVE-2015-8952

---
From sbomify Insights: https://insights.sbomify.com/CVE-2015-8952/
Summaries are generated and may contain mistakes; the official description above is the record.