Linux Kernel up to 6.6.x nft_set_pipapo.c nft_pipapo_walk use after free

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

Summaryinfo

A vulnerability identified as critical has been detected in Linux Kernel up to 6.6.x. The impacted element is the function nft_pipapo_walk of the file net/netfilter/nft_set_pipapo.c. This manipulation causes use after free. The identification of this vulnerability is CVE-2023-6817. The attack can only be executed locally. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.6.x (Operating System). It has been declared as critical. Affected by this vulnerability is the function nft_pipapo_walk of the file net/netfilter/nft_set_pipapo.c. 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. The summary by CVE is:

A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to achieve local privilege escalation. The function nft_pipapo_walk did not skip inactive elements during set walk which could lead double deactivations of PIPAPO (Pile Packet Policies) elements, leading to use-after-free. We recommend upgrading past commit 317eb9685095678f2c9f5a8189de698c5354316a.

The weakness was shared 12/18/2023 by Lonial Kong. It is possible to read the advisory at kernel.dance. This vulnerability is known as CVE-2023-6817 since 12/14/2023. 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 12/18/2023).

Upgrading to version 6.7 eliminates this vulnerability. Applying a patch 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.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.8
VulDB Meta Temp Score: 7.6

VulDB Base Score: 7.8
VulDB Temp Score: 7.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 7.8
CNA Vector (Google Inc.): 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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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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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 6.7
Patch: git.kernel.org

Timelineinfo

12/14/2023 🔍
12/18/2023 +4 days 🔍
12/18/2023 +0 days 🔍
12/18/2023 +0 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: kernel.dance
Researcher: Lonial Kong
Status: Confirmed

CVE: CVE-2023-6817 (🔍)
GCVE (CVE): GCVE-0-2023-6817
GCVE (VulDB): GCVE-100-248299

Entryinfo

Created: 12/18/2023 19:08
Changes: 12/18/2023 19:08 (54)
Complete: 🔍
Cache ID: 216::103

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