Linux Kernel up to 6.18.29/7.0.6 riscv host_context allocation of resources

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.18.29/7.0.6. It has been rated as critical. This impacts the function host_context of the component riscv. Performing a manipulation results in allocation of resources. This vulnerability is cataloged as CVE-2026-46171. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.18.29/7.0.6. It has been classified as critical. This affects the function host_context of the component riscv. The manipulation with an unknown input leads to a allocation of resources vulnerability. CWE is classifying the issue as 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. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: riscv: kvm: fix vector context allocation leak When the second kzalloc (host_context.vector.datap) fails in kvm_riscv_vcpu_alloc_vector_context, the first allocation (guest_context.vector.datap) is leaked. Free it before returning.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-46171 since 05/13/2026. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 6.18.30, 7.0.7 or 7.1-rc1 eliminates this vulnerability. Applying the patch bd62c0f61bc722a097417401030c596cea8e21aa/1d57ab45ec5c0e22789de793bcf2a31ad6fb7d98/b7c958d7c1eb1cb9b2be7b5ee4129fcd66cec978 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

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 6.18.0
• 6.18.1
• 6.18.2
• 6.18.3
• 6.18.4
• 6.18.5
• 6.18.6
• 6.18.7
• 6.18.8
• 6.18.9
• 6.18.10
• 6.18.11
• 6.18.12
• 6.18.13
• 6.18.14
• 6.18.15
• 6.18.16
• 6.18.17
• 6.18.18
• 6.18.19
• 6.18.20
• 6.18.21
• 6.18.22
• 6.18.23
• 6.18.24
• 6.18.25
• 6.18.26
• 6.18.27
• 6.18.28
• 6.18.29
• 7.0.0
• 7.0.1
• 7.0.2
• 7.0.3
• 7.0.4
• 7.0.5
• 7.0.6

License

• open-source

Website

• Vendor: https://www.kernel.org/

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