# CVE-2018-7757: Denial of service in n/a

> Local attackers can cause a denial of service via memory consumption by repeatedly reading specific SAS PHY files in the Linux kernel.

- **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:** 8 Mar 2018
- **Updated:** 5 Aug 2024
- **Also known as:** CLEANSTART-2024-PN25798, DEBIAN-CVE-2018-7757, GHSA-4wjx-42q4-77fh, UBUNTU-CVE-2018-7757

## What is CVE-2018-7757?

CVE-2018-7757 is a medium-severity denial of service vulnerability in Linux kernel, published on 8 Mar 2018. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Memory leak in the sas_smp_get_phy_events function in drivers/scsi/libsas/sas_expander.c in the Linux kernel through 4.15.7 allows local users to cause a denial of service (memory consumption) via many read accesses to files in the /sys/class/sas_phy directory, as demonstrated by the /sys/class/sas_phy/phy-1:0:12/invalid_dword_count file.

Weakness: CWE-772 (Missing Release of Resource after Effective Lifetime)

## Which versions are affected by CVE-2018-7757?

It affects 1 product.


Products: Linux kernel.

## How do I fix CVE-2018-7757?

Apply the vendor's patch.

## Is CVE-2018-7757 being exploited?

There is no known exploitation of CVE-2018-7757 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-2018-7757 and fix it if it is affected.

What it is: CVE-2018-7757 is a medium-severity denial of service vulnerability in Linux kernel, published on 8 Mar 2018. 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-2018-7757 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-2018-7757/ (Markdown: https://insights.sbomify.com/CVE-2018-7757/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-7757
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-7757
- OSV: https://osv.dev/vulnerability/CVE-2018-7757

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-7757/
Summaries are generated and may contain mistakes; the official description above is the record.