CVE-2025-39688

MediumCVSS 5.5/10Last modified Oct 15, 2026

Description

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

nfsd: allow SC_STATUS_FREEABLE when searching via nfs4_lookup_stateid()

The pynfs DELEG8 test fails when run against nfsd. It acquires a delegation and then lets the lease time out. It then tries to use the deleg stateid and expects to see NFS4ERR_DELEG_REVOKED, but it gets bad NFS4ERR_BAD_STATEID instead.

When a delegation is revoked, it's initially marked with SC_STATUS_REVOKED, or SC_STATUS_ADMIN_REVOKED and later, it's marked with the SC_STATUS_FREEABLE flag, which denotes that it is waiting for s FREE_STATEID call.

nfs4_lookup_stateid() accepts a statusmask that includes the status flags that a found stateid is allowed to have. Currently, that mask never includes SC_STATUS_FREEABLE, which means that revoked delegations are (almost) never found.

Add SC_STATUS_FREEABLE to the always-allowed status flags, and remove it from nfsd4_delegreturn() since it's now always implied.

Metrics

CVSS 3.1 5.5/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected software

VendorProductVersions
LinuxLinux>= 8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a, < 52e209203c35a4fbff8af23cd3613efe5df40102; >= 8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a, < dc6f3295905d7185e71091870119a8c11c3808cc; >= 8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a, < 5bcb44e650bc4ec7eac23df90c5e011a77fa2beb; >= 8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a, < d1bc15b147d35b4cb7ca99a9a7d79d41ca342c13; 967faa26f313a62e7bebc55d5b8122eaee43b929; >= 6.11.6, < 6.12
LinuxLinux6.12

References

Timeline

Published
Apr 18, 2025
Last modified
Oct 15, 2026
NVD status
Modified

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CVE-2025-39688: Medium severity, CVSS 5.5 | Vulnix