Linux Kernel Netfilter nft_immediate.c nft_immediate_deactivate use after free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.6$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel. It has been classified as critical. This affects the function nft_immediate_deactivate of the file net/netfilter/nft_immediate.c of the component Netfilter. The manipulation leads to use after free. This vulnerability is uniquely identified as CVE-2023-4015. Local access is required to approach this attack. No exploit exists. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability was found in Linux Kernel (Operating System) (unknown version) and classified as critical. This issue affects the function nft_immediate_deactivate of the file net/netfilter/nft_immediate.c of the component Netfilter. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is 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. On an error when building a nftables rule, deactivating immediate expressions in nft_immediate_deactivate() can lead unbinding the chain and objects be deactivated but later used. We recommend upgrading past commit 0a771f7b266b02d262900c75f1e175c7fe76fec2.

The weakness was disclosed 09/06/2023. It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2023-4015 since 07/31/2023. 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 09/06/2023).

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

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

Productinfo

Type

Vendor

Name

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: Patch
Status: 🔍

0-Day Time: 🔍

Patch: git.kernel.org

Timelineinfo

07/31/2023 🔍
09/06/2023 +37 days 🔍
09/06/2023 +0 days 🔍
09/06/2023 +0 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2023-4015 (🔍)
GCVE (CVE): GCVE-0-2023-4015
GCVE (VulDB): GCVE-100-239027

Entryinfo

Created: 09/06/2023 16:34
Changes: 09/06/2023 16:34 (51)
Complete: 🔍
Cache ID: 216::103

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