CVE-2026-93689

Summary

WinFsp through 2.2.26215 contains a null pointer dereference vulnerability in the kernel driver's Fast I/O device control handler that fails to validate the volume context before use. An unprivileged local user can trigger a denial of service by opening the WinFsp control device and issuing FSP_IOCTL_TRANSACT requests, causing a system crash.

Affected Software

Weaknesses

• CWE-476: NULL Pointer Dereference

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

• https://github.com/winfsp/winfsp/commit/b8103265ec63fa87ac264c62bb796dbc38376652
• https://github.com/winfsp/winfsp
• https://github.com/winfsp/winfsp/blob/v2.2B4/src/sys/devctl.c#L68-L73
• https://github.com/winfsp/winfsp/blob/v2.2B4/src/sys/devctl.c#L105-L114
• https://github.com/winfsp/winfsp/blob/v2.2B4/src/sys/devctl.c#L146-L152
• https://github.com/winfsp/winfsp/blob/v2.2B4/src/sys/volume.c#L1059-L1060
• https://github.com/winfsp/winfsp/releases/tag/v2.2B4
• https://www.vulncheck.com/advisories/winfsp-through-2.2.26215-null-pointer-dereference-via-fast-i-o

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