Linux Kernel up to 6.18.13/6.19.3 bpf allocation of resources

CVSS Meta Temp Score
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CTI Interest Score
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5.4$0-$5k0.00

Summaryinfo

A vulnerability described as critical has been identified in Linux Kernel up to 6.18.13/6.19.3. The affected element is an unknown function of the component bpf. Executing a manipulation can lead to allocation of resources. This vulnerability is handled as CVE-2026-45971. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 6.18.13/6.19.3 and classified as critical. This vulnerability affects an unknown code block of the component bpf. The manipulation with an unknown input leads to a allocation of resources vulnerability. The CWE definition for the vulnerability is CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. The impact remains unknown. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: bpf: Limit bpf program signature size Practical BPF signatures are significantly smaller than KMALLOC_MAX_CACHE_SIZE Allowing larger sizes opens the door for abuse by passing excessive size values and forcing the kernel into expensive allocation paths (via kmalloc_large or vmalloc).

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2026-45971 since 05/13/2026. There are neither technical details nor an exploit publicly available.

Upgrading to version 6.18.14 or 6.19.4 eliminates this vulnerability. Applying the patch 5835a077c6f5c565d525eaca9fac01572b97a9b9/eb8166c79097996396468a341de258a798789d36/ea1535e28bb3773fc0b3cbd1f3842b808016990c 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.

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Productinfo

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Vendor

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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: 5.5
VulDB Meta Temp Score: 5.4

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

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

Exploitinginfo

Class: Allocation of resources
CWE: CWE-770 / CWE-400 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

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 6.18.14/6.19.4
Patch: 5835a077c6f5c565d525eaca9fac01572b97a9b9/eb8166c79097996396468a341de258a798789d36/ea1535e28bb3773fc0b3cbd1f3842b808016990c

Timelineinfo

05/13/2026 CVE reserved
05/27/2026 +14 days Advisory disclosed
05/27/2026 +0 days VulDB entry created
06/16/2026 +20 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-45971 (🔒)
GCVE (CVE): GCVE-0-2026-45971
GCVE (VulDB): GCVE-100-366196

Entryinfo

Created: 05/27/2026 17:10
Updated: 06/16/2026 09:01
Changes: 05/27/2026 17:10 (58), 06/16/2026 09:01 (10)
Complete: 🔍
Cache ID: 216::103

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