# CVE-2019-7308: Information disclosure in n/a

> Attackers can exploit speculative execution flaws in the Linux kernel BPF verifier to leak sensitive memory contents via side-channel attacks.

- **Severity:** Medium 5.6 (`CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/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:** Yes
- **Published:** 1 Feb 2019
- **Updated:** 4 Aug 2024
- **Also known as:** DEBIAN-CVE-2019-7308, GHSA-vww8-62hf-x3fx, UBUNTU-CVE-2019-7308

## What is CVE-2019-7308?

CVE-2019-7308 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 1 Feb 2019. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

kernel/bpf/verifier.c in the Linux kernel before 4.20.6 performs undesirable out-of-bounds speculation on pointer arithmetic in various cases, including cases of different branches with different state or limits to sanitize, leading to side-channel attacks.

Weakness: CWE-189

## Which versions are affected by CVE-2019-7308?

It affects 3 products.


Products: Canonical Ubuntu Linux, Linux kernel, Opensuse Leap.

## How do I fix CVE-2019-7308?

Apply the vendor's patch.

## Is CVE-2019-7308 being exploited?

There is no known exploitation of CVE-2019-7308 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-2019-7308 and fix it if it is affected.

What it is: CVE-2019-7308 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 1 Feb 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-2019-7308 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-2019-7308/ (Markdown: https://insights.sbomify.com/CVE-2019-7308/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-7308
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-7308
- OSV: https://osv.dev/vulnerability/CVE-2019-7308

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-7308/
Summaries are generated and may contain mistakes; the official description above is the record.