# CVE-2024-47749: RDMA/cxgb4: Added NULL check for lookup_atid

> A missing NULL check in the cxgb4 RDMA driver allows attackers to trigger a kernel crash via invalid ATID lookups, causing denial of service.

- **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:** 21 Oct 2024
- **Updated:** 5 Aug 2026
- **Also known as:** AZL-50673, AZL-50682, BELL-CVE-2024-47749, DEBIAN-CVE-2024-47749, GHSA-pr54-g5f8-4jqw, UBUNTU-CVE-2024-47749

## What is CVE-2024-47749?

CVE-2024-47749 is a high-severity vulnerability in Linux kernel, published on 21 Oct 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:

RDMA/cxgb4: Added NULL check for lookup_atid

The lookup_atid() function can return NULL if the ATID is
invalid or does not exist in the identifier table, which
could lead to dereferencing a null pointer without a
check in the `act_establish()` and `act_open_rpl()` functions.
Add a NULL check to prevent null pointer dereferencing.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2024-47749?

It affects 1 product.


Products: Linux kernel.

## How do I fix CVE-2024-47749?

Apply the vendor's patch.

## Is CVE-2024-47749 being exploited?

There is no known exploitation of CVE-2024-47749 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-2024-47749 and fix it if it is affected.

What it is: CVE-2024-47749 is a high-severity vulnerability in Linux kernel, published on 21 Oct 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-2024-47749 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-2024-47749/ (Markdown: https://insights.sbomify.com/CVE-2024-47749/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-47749
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-47749
- OSV: https://osv.dev/vulnerability/CVE-2024-47749

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-47749/
Summaries are generated and may contain mistakes; the official description above is the record.