# CVE-2023-28466: Race condition in n/a > A race condition in the Linux kernel TLS module can lead to use-after-free or null pointer dereference, potentially causing denial of service or code execution. - **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:** 15 Mar 2023 - **Updated:** 5 May 2025 - **Also known as:** ALSA-2023:3819, ALSA-2023:3847, AZL-25661, DEBIAN-CVE-2023-28466, GHSA-wp8x-2wq9-8f64, RHSA-2023:3819, RHSA-2023:3847, RLSA-2023:3819, RLSA-2023:3847, UBUNTU-CVE-2023-28466 ## What is CVE-2023-28466? CVE-2023-28466 is a high-severity vulnerability in Debian Debian Linux, published on 15 Mar 2023. It can only be exploited from the same machine or local network, with no action from the victim. ### Official description do_tls_getsockopt in net/tls/tls_main.c in the Linux kernel through 6.2.6 lacks a lock_sock call, leading to a race condition (with a resultant use-after-free or NULL pointer dereference). Weakness: CWE-476 (NULL Pointer Dereference) ## Which versions are affected by CVE-2023-28466? It affects 7 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `bpftool` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.el8_8 | | `kernel` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.el8_8 | | `kernel-abi-stablelists` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.el8_8 | | `kernel-core` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.el8_8 | | `kernel-cross-headers` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.el8_8 | | `kernel-debug` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.el8_8 | | `kernel-debug-core` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.el8_8 | | `kernel-debug-devel` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.el8_8 | | `kernel-debug-modules` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.el8_8 | | `kernel-debug-modules-extra` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.el8_8 | | `kernel-devel` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.el8_8 | | `kernel-doc` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.el8_8 | | `kernel-modules` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.el8_8 | | `kernel-modules-extra` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.el8_8 | | `kernel-rt` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.rt7.278.el8_8 | | `kernel-rt-core` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.rt7.278.el8_8 | | `kernel-rt-debug` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.rt7.278.el8_8 | | `kernel-rt-debug-core` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.rt7.278.el8_8 | | `kernel-rt-debug-devel` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.rt7.278.el8_8 | | `kernel-rt-debug-kvm` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.rt7.278.el8_8 | | `kernel-rt-debug-modules` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.rt7.278.el8_8 | | `kernel-rt-debug-modules-extra` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.rt7.278.el8_8 | | `kernel-rt-devel` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.rt7.278.el8_8 | | `kernel-rt-kvm` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.rt7.278.el8_8 | | `kernel-rt-modules` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.rt7.278.el8_8 | | `kernel-rt-modules-extra` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.rt7.278.el8_8 | | `kernel-tools` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.el8_8 | | `kernel-tools-libs` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.el8_8 | | `kernel-tools-libs-devel` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.el8_8 | | `kernel-zfcpdump` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.el8_8 | | `kernel-zfcpdump-core` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.el8_8 | | `kernel-zfcpdump-devel` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.el8_8 | | `kernel-zfcpdump-modules` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.el8_8 | | `kernel-zfcpdump-modules-extra` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.el8_8 | | `perf` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.el8_8 | | `python3-perf` | AlmaLinux:8 | All versions | 4.18.0-477.15.1.el8_8 | | `bpftool` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-477.15.1.el8_8 | | `bpftool-debuginfo` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-477.15.1.el8_8 | | `kernel` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-477.15.1.el8_8 | | `kernel-abi-stablelists` | Red Hat:enterprise_linux:8::baseos | All versions | 0:4.18.0-477.15.1.el8_8 | Products: Debian Debian Linux, Linux kernel, Netapp H300s, Netapp H410c, Netapp H410s, Netapp H500s, Netapp H700s. ## How do I fix CVE-2023-28466? Apply the vendor's patch. ## Is CVE-2023-28466 being exploited? There is no known exploitation of CVE-2023-28466 in the wild and no public exploit code. ## Other vulnerabilities in Debian Debian Linux - [CVE-2015-3306](https://insights.sbomify.com/CVE-2015-3306/): ProFTPD Improper Access Control (critical 10.0, exploited in the wild) - [CVE-2025-49113](https://insights.sbomify.com/CVE-2025-49113/): RoundCube Webmail Deserialization of Untrusted Data (critical 9.9, exploited in the wild) - [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild) - [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild) - [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2023-28466 and fix it if it is affected. What it is: CVE-2023-28466 is a high-severity vulnerability in Debian Debian Linux, published on 15 Mar 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-2023-28466 in the wild and no public exploit code. Affected product: Debian Debian 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-2023-28466/ (Markdown: https://insights.sbomify.com/CVE-2023-28466/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2023-28466 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-28466 - OSV: https://osv.dev/vulnerability/CVE-2023-28466 --- From sbomify Insights: https://insights.sbomify.com/CVE-2023-28466/ Summaries are generated and may contain mistakes; the official description above is the record.