CVE-2025-21900

Summary

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

NFSv4: Fix a deadlock when recovering state on a sillyrenamed file

If the file is sillyrenamed, and slated for delete on close, it is possible for a server reboot to triggeer an open reclaim, with can again race with the application call to close(). When that happens, the call to put_nfs_open_context() can trigger a synchronous delegreturn call which deadlocks because it is not marked as privileged.

Instead, ensure that the call to nfs4_inode_return_delegation_on_close() catches the delegreturn, and schedules it asynchronously.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxadb4b42d19aea91826621a8d0bac94cf2c08f8bc < 4fe4ae6c2e01d028856b73b6328b12b8945df871affected
LinuxLinuxadb4b42d19aea91826621a8d0bac94cf2c08f8bc < f41a60bc43e7abbc636fee78bed0d74c31e738b0affected
LinuxLinuxadb4b42d19aea91826621a8d0bac94cf2c08f8bc < 8f8df955f078e1a023ee55161935000a67651f38affected
LinuxLinux6.11affected
LinuxLinux0 < 6.11unaffected
LinuxLinux6.12.18 <= 6.12.*unaffected
LinuxLinux6.13.6 <= 6.13.*unaffected
LinuxLinux6.14 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

References