CVE-2026-90038Hinoki check available

Client use-after-free during concurrent export revocation

Published Sep 16, 2026 · Updated Sep 16, 2026

Use-after-free in Linux 7.2 NFSD allows local users to trigger a freed client-memory dereference during concurrent export revocation. nfsd4_revoke_export_states() drops nn->client_lock across revoke_one_stid() and then reads clp->cl_minorversion without a reference that pins the client. Reaching the flaw requires an administrator to remove an export through NFSD_CMD_UNLOCK_EXPORT while client expiry tears down the same client; the published record establishes no crash or code-execution outcome.

CVSS severityUnavailable
Unscored
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Use-after-free in Linux 7.2 NFSD allows local users to trigger a freed client-memory dereference during concurrent export revocation. nfsd4_revoke_export_states() drops nn->client_lock across revoke_one_stid() and then reads clp->cl_minorversion without a reference that pins the client. Reaching the flaw requires an administrator to remove an export through NFSD_CMD_UNLOCK_EXPORT while client expiry tears down the same client; the published record establishes no crash or code-execution outcome.

The record

CVE
CVE-2026-90038
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=2eac189bb059d31a29937b29ee0f477394198610 <2108de53568a64936a0da3e04d85c35df98d3fb6
  2. Affected versionversion=2eac189bb059d31a29937b29ee0f477394198610 <c05ae58fe06ce2ac34312f649e71c3596bdde358
  3. Affected versionversion=7.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=2eac189bb059d31a29937b29ee0f477394198610 <2108de53568a64936a0da3e04d85c35df98d3fb6; version=2eac189bb059d31a29937b29ee0f477394198610 <c05ae58fe06ce2ac34312f649e71c3596bdde358; version=7.2

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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