Answer in brief
CVE-2025-39688 records a High severity (CVSS 7.5) vulnerability in nfsd: allow SC_STATUS_FREEABLE when searching via nfs4_lookup_stateid(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.12:-:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.12:rc5:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.12:rc6:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:6.12:rc7:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a <52e209203c35a4fbff8af23cd3613efe5df40102 || >=8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a <dc6f3295905d7185e71091870119a8c11c3808cc || >=8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a <5bcb44e650bc4ec7eac23df90c5e011a77fa2beb || >=8dd91e8d31febf4d9cca3ae1bb4771d33ae7ee5a <d1bc15b147d35b4cb7ca99a9a7d79d41ca342c13 || 967faa26f313a62e7bebc55d5b8122eaee43b929 || >=6.11.6 <6.12 | 52e209203c35a4fbff8af23cd3613efe5df40102, dc6f3295905d7185e71091870119a8c11c3808cc, 5bcb44e650bc4ec7eac23df90c5e011a77fa2beb, d1bc15b147d35b4cb7ca99a9a7d79d41ca342c13, 6.12 |
| Linux/Linuxgeneric | 6.12 | Not reported |
Published upstream
Apr 18, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.