Linux Kernel TLS /net/tls/tls_sw.c tls_sw_sendmsg_splice out-of-bounds write

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.2$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel. It has been classified as critical. The affected element is the function tls_sw_sendmsg_splice of the file /net/tls/tls_sw.c of the component TLS Handler. This manipulation causes out-of-bounds write. The identification of this vulnerability is CVE-2024-0646. The attack can only be executed locally. There is no exploit available. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability classified as critical was found in Linux Kernel (Operating System) (unknown version). Affected by this vulnerability is the function tls_sw_sendmsg_splice of the file /net/tls/tls_sw.c of the component TLS Handler. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

An out-of-bounds memory write flaw was found in the Linux kernel’s Transport Layer Security functionality in how a user calls a function splice with a ktls socket as the destination. This flaw allows a local user to crash or potentially escalate their privileges on the system.

The weakness was shared 01/17/2024. The advisory is shared at access.redhat.com. This vulnerability is known as CVE-2024-0646 since 01/17/2024. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/09/2025).

The vulnerability scanner Nessus provides a plugin with the ID 239742 (TencentOS Server 2: kernel (TSSA-2024:1030)), which helps to determine the existence of the flaw in a target environment.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org.

The vulnerability is also documented in the databases at Tenable (239742) and EUVD (EUVD-2024-16438). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.0
VulDB Temp Score: 6.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CNA Base Score: 7.0
CNA Vector (Red Hat, Inc.): 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds write
CWE: CWE-787 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 239742
Nessus Name: TencentOS Server 2: kernel (TSSA-2024:1030)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: git.kernel.org

Timelineinfo

01/17/2024 🔍
01/17/2024 +0 days 🔍
01/17/2024 +0 days 🔍
10/09/2025 +631 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: RHSA-2024:0723
Status: Confirmed

CVE: CVE-2024-0646 (🔍)
GCVE (CVE): GCVE-0-2024-0646
GCVE (VulDB): GCVE-100-251389
EUVD: 🔍

Entryinfo

Created: 01/17/2024 17:20
Updated: 10/09/2025 17:02
Changes: 01/17/2024 17:20 (51), 02/10/2024 21:04 (1), 02/10/2024 21:12 (12), 06/26/2024 01:39 (15), 06/20/2025 23:34 (3), 10/09/2025 17:02 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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