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CVE-2026-47753— Incus has a Nil-Pointer Dereference Panic via Instance Backup Import (volume omitted)

Quick assessment

Affected
lxc incus
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Incus 是一个系统容器和虚拟机管理器。在 7.1.0 版本之前， 中的 函数存在空指针解引用漏洞。拥有在任何项目中创建实例权限的已认证用户，可以通过上传特制的备份 tarball 文件远程触发该漏洞。该漏洞会导致 Incus 守护进程发生 panic 并崩溃，从而对该集群成员上的所有项目造成拒绝服务（DoS）影响。 此漏洞是以下安全公告的同类问题：GHSA-fwj8-62r8-8p8m、GHSA-r7w7-mmxr-47r9 和 GHSA-x5r6-jr56-89pv（上述公告的披露日期均为 2026-05-0

CVSS 4.4 · Medium EPSS 0.14% · P4

Affected Version Matrix 1

VendorProduct Version RangeStatus
lxc incus < 7.1.0 affected
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I. Basic Information for CVE-2026-47753

Vulnerability Information
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Vulnerability Title
Incus has a Nil-Pointer Dereference Panic via Instance Backup Import (volume omitted)
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
lxc incus < 7.1.0 -

II. Public POCs for CVE-2026-47753

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III. Intelligence Information for CVE-2026-47753

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Patches & Fixes for CVE-2026-47753 (1)

Vendor Advisories for CVE-2026-47753 (1)

Same Patch Batch · lxc · 2026-08-21 · 18 CVEs total

CVE-2026-62941 9.9 CRITICAL Incus: Cross-project instance copy bypasses target project restrictions via TOCTOU in conf
CVE-2026-63343 9.9 CRITICAL Arbitrary File Read/Write: metadata.yaml symlink in image allows host filesystem access as
CVE-2026-63125 9.9 CRITICAL Incus vulnerable to root RCE via image backup.yaml symlink
CVE-2026-48769 9.9 CRITICAL Incus has an arbitrary file write on its client due to trusted image hash
CVE-2026-48755 9.9 CRITICAL Incus has an argument injection in backup compression algorithm leading to AFW and ACE
CVE-2026-62867 9.9 CRITICAL Incus has an argument injection in storage volume block.create_options that leads to arbit
CVE-2026-48750 9.9 CRITICAL Incus has an arbitrary file write on host via `exec-output` symlink in crafted image
CVE-2026-62940 9.9 CRITICAL Incus has a project restriction bypass via instance migration config override
CVE-2026-48752 9.9 CRITICAL Incus has arbitrary file read+write on host via templates/ symlink in malicious image
CVE-2026-48751 9.9 CRITICAL Incus has a restricted project bypass leading to arbitrary command execution
CVE-2026-48753 9.9 CRITICAL Incus has an arbitrary file write via path traversal in S3 multipart upload
CVE-2026-48749 9.9 CRITICAL Incus has an arbitrary file read+write on host via rootfs/ symlink in malicious image
CVE-2026-55621 7.7 HIGH Incus has a project restriction bypass for custom volume copy across projects
CVE-2026-55622 7.7 HIGH Incus has a project restriction bypass in instance copy across projects
CVE-2026-62313 4.3 MEDIUM Incus: Project restriction `restricted.containers.privilege=isolated` bypassable by omitti
CVE-2026-48754 2.1 LOW Incus: Nil-pointer dereference in createDependentVolumesFromBackup on disk.{Volume,VolumeS
CVE-2026-48756 2.1 LOW Incus: CreateCustomVolumeFromBackup nil-pointer dereference on volume_snapshots[*].expires

IV. Related Vulnerabilities

Same product: incus
Same vendor: lxc
Same weakness: CWE-476

V. Comments for CVE-2026-47753

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