# CVE-2024-47668: lib/generic-radix-tree.c: Fix rare race in __genradix_ptr_alloc()

> A race condition in the Linux kernel's generic radix tree allows attackers to read or modify stale memory pointers, potentially leading to data corruption or information disclosure.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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:** 9 Oct 2024
- **Updated:** 5 Aug 2026
- **Also known as:** BELL-CVE-2024-47668, DEBIAN-CVE-2024-47668, GHSA-r4v9-v8c5-298p, ROOT-OS-DEBIAN-11-CVE-2024-47668, UBUNTU-CVE-2024-47668

## What is CVE-2024-47668?

CVE-2024-47668 is a high-severity vulnerability in Linux kernel, published on 9 Oct 2024. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

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

lib/generic-radix-tree.c: Fix rare race in __genradix_ptr_alloc()

If we need to increase the tree depth, allocate a new node, and then
race with another thread that increased the tree depth before us, we'll
still have a preallocated node that might be used later.

If we then use that node for a new non-root node, it'll still have a
pointer to the old root instead of being zeroed - fix this by zeroing it
in the cmpxchg failure path.

Weakness: CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization)

## Which versions are affected by CVE-2024-47668?

It affects 1 product.


Products: Linux kernel.

## How do I fix CVE-2024-47668?

Apply the vendor's patch.

## Is CVE-2024-47668 being exploited?

There is no known exploitation of CVE-2024-47668 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-2024-47668 and fix it if it is affected.

What it is: CVE-2024-47668 is a high-severity vulnerability in Linux kernel, published on 9 Oct 2024. 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-2024-47668 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-2024-47668/ (Markdown: https://insights.sbomify.com/CVE-2024-47668/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-47668
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-47668
- OSV: https://osv.dev/vulnerability/CVE-2024-47668

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-47668/
Summaries are generated and may contain mistakes; the official description above is the record.