nfsd: check client ownership when cancelling a copy-notify stateid (CVE-2026-89694) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-89694

nfsd: check client ownership when cancelling a copy-notify stateid

Answer in brief

CVE-2026-89694 records a Unknown severity vulnerability in nfsd: check client ownership when cancelling a copy-notify 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.

Published Sep 11, 2026Updated Sep 11, 2026Source checked Sep 11, 2026First seen by HOL Sep 11, 2026Material review Sep 11, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. 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.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=ce0887ac96d35c7105090e166bb0807dc0a0e838 <b1eca07303594ca27f5dc360a6946bd7e1f5b04c \|\| >=ce0887ac96d35c7105090e166bb0807dc0a0e838 <b42dc26a14b4ad5d6daaada11ec4c70744141c25 \|\| >=ce0887ac96d35c7105090e166bb0807dc0a0e838 <d801906165cb5cc250d5cbe44935594e170be3e2 \|\| >=ce0887ac96d35c7105090e166bb0807dc0a0e838 <6bdbfab96e0cf25e5f57dac5c09dc1749751a4bf	b1eca07303594ca27f5dc360a6946bd7e1f5b04c, b42dc26a14b4ad5d6daaada11ec4c70744141c25, d801906165cb5cc250d5cbe44935594e170be3e2, 6bdbfab96e0cf25e5f57dac5c09dc1749751a4bf
Linux/Linuxgeneric	5.6	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to b1eca07303594ca27f5dc360a6946bd7e1f5b04c if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 11, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: nfsd: check client ownership when cancelling a copy-notify stateid On the OFFLOAD_CANCEL path (clp != NULL), manage_cpntf_state() freed the target cpntf state without checking ownership. The lookup key st->si_opaque.so_id is allocated cyclically (guessable) and the embedded clientid is the fixed per-net nn->s2s_cp_cl_id, so any authenticated NFSv4.2 client could cancel and free another client's copy-notify stateid. Compare the creating clientid recorded in state->cp_p_clid against the requesting client's cl_clientid and return nfserr_bad_stateid on a mismatch instead of freeing the entry.

Quoted source text, attributed separately from HOL analysis.