# CVE-2019-19965: Null dereference in n/a

> A NULL pointer dereference in the Linux kernel SCSI subsystem allows local attackers to cause a denial of service via a race condition during port disconnection.

- **Severity:** Medium 4.7 (`CVSS:3.1/AV:L/AC:H/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:** 25 Dec 2019
- **Updated:** 8 Oct 2026
- **Also known as:** DEBIAN-CVE-2019-19965, GHSA-fg2v-2x5h-36qc, UBUNTU-CVE-2019-19965

## What is CVE-2019-19965?

CVE-2019-19965 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 25 Dec 2019. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

In the Linux kernel through 5.4.6, there is a NULL pointer dereference in drivers/scsi/libsas/sas_discover.c because of mishandling of port disconnection during discovery, related to a PHY down race condition, aka CID-f70267f379b5.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2019-19965?

It affects 16 products.


Products: Canonical Ubuntu Linux, Debian Debian Linux, Linux kernel, Netapp 8300 Firmware, Netapp 8700 Firmware, Netapp A400 Firmware, Netapp A700s Firmware, Netapp Active Iq Unified Manager, Netapp Cloud Backup, Netapp Data Availability Services, Netapp E-Series Santricity Os Controller, Netapp H610s Firmware, Netapp Hci Management Node, Netapp Solidfire, Netapp Steelstore Cloud Integrated Storage, Opensuse Leap.

## How do I fix CVE-2019-19965?

Apply the vendor's patch.

## Is CVE-2019-19965 being exploited?

There is no known exploitation of CVE-2019-19965 in the wild and no public exploit code.

## Other vulnerabilities in Canonical Ubuntu Linux

- [CVE-2020-11651](https://insights.sbomify.com/CVE-2020-11651/): SaltStack Salt Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2020-7247](https://insights.sbomify.com/CVE-2020-7247/): OpenSMTPD Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2019-16928](https://insights.sbomify.com/CVE-2019-16928/): Exim Out-of-bounds Write (critical 9.8, exploited in the wild)
- [CVE-2018-6789](https://insights.sbomify.com/CVE-2018-6789/): Exim Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2015-2590](https://insights.sbomify.com/CVE-2015-2590/): Oracle Java SE and Java SE Embedded Remote Code Execution (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-19965 and fix it if it is affected.

What it is: CVE-2019-19965 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 25 Dec 2019. 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-2019-19965 in the wild and no public exploit code.

Affected product: Canonical Ubuntu Linux. 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-2019-19965/ (Markdown: https://insights.sbomify.com/CVE-2019-19965/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-19965
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-19965
- OSV: https://osv.dev/vulnerability/CVE-2019-19965

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From sbomify Insights: https://insights.sbomify.com/CVE-2019-19965/
Summaries are generated and may contain mistakes; the official description above is the record.