CVE-2026-31713

Summary

In the Linux kernel, the following vulnerability has been resolved:

fuse: abort on fatal signal during sync init

When sync init is used and the server exits for some reason (error, crash) while processing FUSE_INIT, the filesystem creation will hang. The reason is that while all other threads will exit, the mounting thread (or process) will keep the device fd open, which will prevent an abort from happening.

This is a regression from the async mount case, where the mount was done first, and the FUSE_INIT processing afterwards, in which case there's no such recursive syscall keeping the fd open.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxdfb84c33079497bf27058b15780e1c7bba4c371b < 0c7fca880a40a209a9c92be14143996d14b93ff6affected
LinuxLinuxdfb84c33079497bf27058b15780e1c7bba4c371b < 300e812b882a174dca675d8028684001ad5826bcaffected
LinuxLinuxdfb84c33079497bf27058b15780e1c7bba4c371b < 204aa22a686bfee48daca7db620c1e017615f2ffaffected
LinuxLinux6.18affected
LinuxLinux0 < 6.18unaffected
LinuxLinux6.18.25 <= 6.18.*unaffected
LinuxLinux7.0.2 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References