Linux Kernel SKB unix_stream_read_generic use after free

CVSS Meta Temp Score
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CTI Interest Score
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7.0$5k-$25k0.00

Summaryinfo

A vulnerability classified as critical was found in Linux Kernel. This issue affects the function unix_stream_read_generic of the component SKB Handler. Executing a manipulation can lead to use after free. This vulnerability appears as CVE-2023-6531. The attack requires local access. There is no available exploit.

Detailsinfo

A vulnerability has been found in Linux Kernel (Operating System) (version unknown) and classified as critical. This vulnerability affects the function unix_stream_read_generic of the component SKB Handler. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

A use-after-free flaw was found in the Linux Kernel due to a race problem in the unix garbage collector's deletion of SKB races with unix_stream_read_generic() on the socket that the SKB is queued on.

The weakness was presented 12/27/2023. The advisory is shared for download at bugzilla.redhat.com. This vulnerability was named CVE-2023-6531 since 12/05/2023. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 07/26/2025).

The vulnerability scanner Nessus provides a plugin with the ID 209088 (SUSE SLES15 Security Update : kernel (Live Patch 46 for SLE 15 SP2) (SUSE-SU-2024:3642-1)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (209088) and EUVD (EUVD-2023-58762). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.0
VulDB Meta Temp Score: 7.0

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

NVD Base Score: 7.0
NVD Vector: 🔍

CNA Base Score: 7.0
CNA Vector: 🔍

CVSSv2info

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

Exploitinginfo

Class: Use after free
CWE: CWE-416 / 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: 209088
Nessus Name: SUSE SLES15 Security Update : kernel (Live Patch 46 for SLE 15 SP2) (SUSE-SU-2024:3642-1)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

12/05/2023 🔍
12/27/2023 +22 days 🔍
12/27/2023 +0 days 🔍
07/26/2025 +577 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: bugzilla.redhat.com
Status: Not defined

CVE: CVE-2023-6531 (🔍)
GCVE (CVE): GCVE-0-2023-6531
GCVE (VulDB): GCVE-100-249088
EUVD: 🔍

Entryinfo

Created: 12/27/2023 17:48
Updated: 07/26/2025 03:50
Changes: 12/27/2023 17:48 (37), 09/06/2024 21:38 (35), 10/16/2024 16:33 (2), 07/26/2025 03:50 (1)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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