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CVE Record

CVE-2026-31713: fuse: abort on fatal signal during sync init

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.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This Linux kernel FUSE issue can cause filesystem creation to hang if a FUSE server exits while initialization is in progress. The business impact is service disruption on systems that rely on FUSE mounts, not confirmed data theft or remote compromise.

Executive priority

Treat this as an operational resilience issue until vendors publish clearer severity data. Prioritize patch review for Linux hosts where FUSE mounts support business services, backups, developer platforms, or automation.

Technical view

The bug is in Linux kernel FUSE sync init handling. If the server exits during FUSE_INIT, the mounting thread keeps the device file descriptor open, preventing abort handling and leaving the mount path hung. The CVE references upstream stable commits but provides no CVSS score or CWE.

Likely exposure

Exposure is likely limited to Linux systems running affected kernels and using FUSE-based filesystems. The bundle lists Linux versions including 6.18, 6.18.25, 7.0.2, and 7.1, but fixed-version detail is incomplete.

Exploitation context

The source bundle does not show active exploitation, and the CVE is not listed as KEV. The described failure mode is a hang during FUSE filesystem creation after a server crash or exit, suggesting operational denial of service rather than proven code execution.

Researcher notes

Evidence supports a kernel-side FUSE initialization hang caused by device fd lifetime during sync init. Public data lacks CVSS, CWE, exploit reports, and explicit fixed release mapping, so exposure analysis should stay tied to vendor kernel advisories and commit backports.

Mitigation direction

  • Check Linux distribution advisories for CVE-2026-31713 fixed kernel packages.
  • Apply kernel updates that include the referenced stable FUSE commits.
  • Prioritize systems using FUSE mounts in production or automation paths.
  • Reduce dependency on unstable user-space FUSE servers where practical.
  • Monitor affected systems for repeated hung mount or filesystem creation events.

Validation and detection

  • Inventory Linux kernel versions across servers and container hosts.
  • Identify systems using FUSE-based filesystems or mount workflows.
  • Map vendor kernel packages to the referenced upstream stable commits.
  • Review logs for FUSE_INIT failures, crashed FUSE servers, or hung mounts.
  • Test patched kernels in staging with representative FUSE workloads.
Prepared
Confidence
medium
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

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CVE-2026-31713 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
0ADP providers
4Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxdfb84c33079497bf27058b15780e1c7bba4c371b, dfb84c33079497bf27058b15780e1c7bba4c371b, dfb84c33079497bf27058b15780e1c7bba4c371bunaffected
LinuxLinux6.18, 0, 6.18.25, 7.0.2, 7.1affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.