Linux Kernel up to 6.4.3 bpf tcp_basertt buffer overflow

CVSS Meta Temp Score
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CTI Interest Score
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7.6$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.4.3. It has been classified as critical. The affected element is the function tcp_basertt of the component bpf. Performing a manipulation results in buffer overflow. This vulnerability is known as CVE-2023-54312. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as critical, was found in Linux Kernel up to 6.4.3. This affects the function tcp_basertt of the component bpf. The manipulation with an unknown input leads to a buffer overflow vulnerability. CWE is classifying the issue as CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: samples/bpf: Fix buffer overflow in tcp_basertt Using sizeof(nv) or strlen(nv)+1 is correct.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2023-54312 since 12/30/2025. The exploitability is told to be easy. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 01/01/2026).

The vulnerability scanner Nessus provides a plugin with the ID 280804 (Linux Distros Unpatched Vulnerability : CVE-2023-54312), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.19.291, 5.4.251, 5.10.188, 5.15.121, 6.1.39, 6.3.13 or 6.4.4 eliminates this vulnerability. Applying the patch cf7514fedc25675e68b74941df28a883951e70fd/f394d204d64095d72ad9f03ff98f3f3743bf743a/bd3e880dce27d225598730d2bbb3dc05b443af22/e92f61e0701ea780e57e1be8dbd1fbec5f42c09e/56c25f2763a16db4fa1b486e6a21dc246cd992bd/dfc004688518d24159606289c74d0c4e123e6436/7c08d1b0d1f75117cf82aeaef49ba9f861b3fb59/f4dea9689c5fea3d07170c2cb0703e216f1a0922 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (280804) and CERT Bund (WID-SEC-2025-2941). Be aware that VulDB is the high quality source for vulnerability data.

Affected

  • Open Source Linux Kernel

Productinfo

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.0
VulDB Meta Temp Score: 7.6

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 280804
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2023-54312

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 4.19.291/5.4.251/5.10.188/5.15.121/6.1.39/6.3.13/6.4.4
Patch: cf7514fedc25675e68b74941df28a883951e70fd/f394d204d64095d72ad9f03ff98f3f3743bf743a/bd3e880dce27d225598730d2bbb3dc05b443af22/e92f61e0701ea780e57e1be8dbd1fbec5f42c09e/56c25f2763a16db4fa1b486e6a21dc246cd992bd/dfc004688518d24159606289c74d0c4e123e6436/7c08d1b0d1f75117cf82aeaef49ba9f861b3fb59/f4dea9689c5fea3d07170c2cb0703e216f1a0922

Timelineinfo

12/30/2025 Advisory disclosed
12/30/2025 +0 days CVE reserved
12/30/2025 +0 days VulDB entry created
01/01/2026 +2 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2023-54312 (🔒)
GCVE (CVE): GCVE-0-2023-54312
GCVE (VulDB): GCVE-100-339015
CERT Bund: WID-SEC-2025-2941 - Linux Kernel: Mehrere Schwachstellen ermöglichen Denial of Service

Entryinfo

Created: 12/30/2025 17:06
Updated: 01/01/2026 22:26
Changes: 12/30/2025 17:06 (59), 12/31/2025 14:13 (2), 01/01/2026 22:26 (7)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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