Bug 2521006 (CVE-2026-47753)

Summary: CVE-2026-47753 github.com/lxc/incus: Incus: Denial of Service due to nil-pointer dereference during instance backup import
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in Incus, a system container and virtual machine manager. An authenticated user with permissions to create instances in any project can remotely trigger a nil-pointer dereference by uploading a specially crafted backup tarball. This vulnerability causes the Incus daemon to panic and crash, leading to a denial of service for all projects on the affected cluster member.
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Bug Depends On: 2521984    
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Description OSIDB Bzimport 2026-08-21 14:49:10 UTC
Incus is a system container and virtual machine manager. Prior to version 7.1.0, `(*backend).CreateInstanceFromBackup` in `internal/server/storage/backend.go` contains a nil-pointer dereference that an authenticated user with permission to create instances in any project can trigger remotely by uploading a crafted backup tarball. The Incus daemon panics and the process crashes, causing denial of service to every project on that cluster member. This is a sibling of `GHSA-fwj8-62r8-8p8m`, `GHSA-r7w7-mmxr-47r9`, and `GHSA-x5r6-jr56-89pv` (all assigned 2026-05-04). Those patches added guards on adjacent fields of the same `backup/config.Config` struct; the `Volume` field on the instance-import path was missed. Version 7.1.0 contains an updated patch.