CVE-2025-39688nfsd: allow SC_STATUS_FREEABLE when searching via nfs4_lookup_stateid()
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | from 8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a before 52e209203c35a4fbff8af23cd3613efe5df40102; from 8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a before dc6f3295905d7185e71091870119a8c11c3808cc; 8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a builds before 5bcb44e650bc4ec7eac23df90c5e011a77fa2beb; from 8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a before d1bc15b147d35b4cb7ca99a9a7d79d41ca342c13; 967faa26f313a62e7bebc55d5b8122eaee43b929; from 6.11.6 before 6.12 | CNA record |
linux linux_kernel linux:linux_kernel | from 6.11.6 before 6.12; from 6.12.1 before 6.12.23; from 6.13 before 6.13.11; from 6.14 before 6.14.2; 6.12; 6.12; 6.12; 6.12 | NVD |
References
- https://git.kernel.org/stable/c/52e209203c35a4fbff8af23cd3613efe5df40102patch
- https://git.kernel.org/stable/c/dc6f3295905d7185e71091870119a8c11c3808ccpatch
- https://git.kernel.org/stable/c/5bcb44e650bc4ec7eac23df90c5e011a77fa2bebpatch
- https://git.kernel.org/stable/c/d1bc15b147d35b4cb7ca99a9a7d79d41ca342c13patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.