Bug 2424885 (CVE-2025-68361)

Summary: CVE-2025-68361 kernel: Linux kernel (erofs): Kernel stack overflow due to excessive file system stacking
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A vulnerability was discovered in the Linux kernel’s EROFS (Enhanced Read-Only File System) implementation related to file-backed mount stacking. Without limiting the depth of filesystem stacking, it is possible for an attacker to mount EROFS recursively (e.g., EROFS mounting itself) in such a way that kernel stack usage grows uncontrollably, potentially leading to a kernel stack overflow and system crash. Exploitation requires local access and the ability to initiate nested file-backed erofs mounts.
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Description OSIDB Bzimport 2025-12-24 11:03:40 UTC 
In the Linux kernel, the following vulnerability has been resolved:

erofs: limit the level of fs stacking for file-backed mounts

Otherwise, it could cause potential kernel stack overflow (e.g., EROFS
mounting itself).
Comment 1 Alexander B 2025-12-25 15:24:37 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025122457-CVE-2025-68361-83eb@gregkh/T