# CVE-2023-1476: Kpatch: mm/mremap.c: incomplete fix for cve-2022-41222

> A use-after-free race condition in the Linux kernel allows local attackers to crash the system or escalate privileges.

- **Severity:** High 7.0 (`CVSS:3.1/AV:L/AC:H/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:** 3 Nov 2023
- **Updated:** 27 Feb 2025
- **Also known as:** GHSA-rccq-5462-rgcj

## What is CVE-2023-1476?

CVE-2023-1476 is a high-severity use after free vulnerability in Linux kernel, published on 3 Nov 2023. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A use-after-free flaw was found in the Linux kernel’s mm/mremap memory address space accounting source code. This issue occurs due to a race condition between rmap walk and mremap, allowing a local user to crash the system or potentially escalate their privileges on the system.

Weakness: CWE-416 (Use After Free)

## Which versions are affected by CVE-2023-1476?

It affects 6 products.


Products: Linux kernel, Redhat Enterprise Linux, Redhat Enterprise Linux Eus, Redhat Enterprise Linux for Power Little Endian, Redhat Enterprise Linux for Power Little Endian Eus, Redhat Enterprise Linux Server Tus.

## How do I fix CVE-2023-1476?

Apply the vendor's patch.

## Is CVE-2023-1476 being exploited?

There is no known exploitation of CVE-2023-1476 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-2023-1476 and fix it if it is affected.

What it is: CVE-2023-1476 is a high-severity use after free vulnerability in Linux kernel, published on 3 Nov 2023. 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-2023-1476 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-2023-1476/ (Markdown: https://insights.sbomify.com/CVE-2023-1476/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-1476
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-1476
- OSV: https://osv.dev/vulnerability/CVE-2023-1476

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-1476/
Summaries are generated and may contain mistakes; the official description above is the record.