# CVE-2022-48748: net: bridge: vlan: fix memory leak in __allowed_ingress

> A memory leak in the Linux kernel bridge VLAN code allows attackers to cause denial of service by sending specific untagged frames when VLAN snooping is disabled.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 20 Jun 2024
- **Updated:** 11 May 2026
- **Also known as:** DEBIAN-CVE-2022-48748, GHSA-h9h2-6w4q-6c52, UBUNTU-CVE-2022-48748

## What is CVE-2022-48748?

CVE-2022-48748 is a high-severity denial of service vulnerability in Linux kernel, published on 20 Jun 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In the Linux kernel, the following vulnerability has been resolved:

net: bridge: vlan: fix memory leak in __allowed_ingress

When using per-vlan state, if vlan snooping and stats are disabled,
untagged or priority-tagged ingress frame will go to check pvid state.
If the port state is forwarding and the pvid state is not
learning/forwarding, untagged or priority-tagged frame will be dropped
but skb memory is not freed.
Should free skb when __allowed_ingress returns false.

Weakness: CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2022-48748?

It affects 1 product.


Products: Linux kernel.

## How do I fix CVE-2022-48748?

Apply the vendor's patch.

## Is CVE-2022-48748 being exploited?

There is no known exploitation of CVE-2022-48748 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-2022-48748 and fix it if it is affected.

What it is: CVE-2022-48748 is a high-severity denial of service vulnerability in Linux kernel, published on 20 Jun 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2022-48748 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-2022-48748/ (Markdown: https://insights.sbomify.com/CVE-2022-48748/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-48748
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-48748
- OSV: https://osv.dev/vulnerability/CVE-2022-48748

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-48748/
Summaries are generated and may contain mistakes; the official description above is the record.