nfsd: validate nseconds in TIME_DELEG decode paths (CVE-2026-89701) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-89701

nfsd: validate nseconds in TIME_DELEG decode paths

Answer in brief

CVE-2026-89701 records a Unknown severity vulnerability in nfsd: validate nseconds in TIME_DELEG decode paths. 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	>=6ae30d6eb26bce02c48c60074b4306270e2434c1 <7e7b93da7fa2e77f977096251899d1410986adf6 \|\| >=6ae30d6eb26bce02c48c60074b4306270e2434c1 <5eb489831a9fd4754f4baf26e6989efb66ce104c \|\| >=6ae30d6eb26bce02c48c60074b4306270e2434c1 <0f4a767340fad392bd656115b8752005518c9065	7e7b93da7fa2e77f977096251899d1410986adf6, 5eb489831a9fd4754f4baf26e6989efb66ce104c, 0f4a767340fad392bd656115b8752005518c9065
Linux/Linuxgeneric	6.14	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 7e7b93da7fa2e77f977096251899d1410986adf6 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: validate nseconds in TIME_DELEG decode paths The xdrgen-based TIME_DELEG_ACCESS and TIME_DELEG_MODIFY decode arms store a raw uint32_t nseconds directly into tv_nsec without enforcing nseconds < NSEC_PER_SEC. The legacy nfsd4_decode_nfstime4 has this check but the TIME_DELEG paths do not. A malformed timespec can propagate through notify_change() to disk. Add range checks in both nfs4xdr.c (SETATTR path) and nfs4callback.c (CB_GETATTR path).

Quoted source text, attributed separately from HOL analysis.