CVE-2026-89545

RPC request use-after-free via premature buffer release

Published Sep 11, 2026 · Updated Sep 11, 2026

Use-after-free in the SunRPC server code in Linux allows attackers to dereference freed RPC request memory during status enumeration. svc_rqst_free() releases rq_argp and rq_resp before an RCU grace period, while an earlier nfsd_nl_rpc_status_get_dumpit() reader can still reach the request. The race requires request teardown to overlap RPC-status enumeration; the published record states no consequence beyond invalid access to freed kernel memory.

CVSS severityUnavailable
Unscored
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the SunRPC server code in Linux allows attackers to dereference freed RPC request memory during status enumeration. svc_rqst_free() releases rq_argp and rq_resp before an RCU grace period, while an earlier nfsd_nl_rpc_status_get_dumpit() reader can still reach the request. The race requires request teardown to overlap RPC-status enumeration; the published record states no consequence beyond invalid access to freed kernel memory.

The record

CVE
CVE-2026-89545
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.19
  2. Affected versionversion=812443865c5fc255363d4a684a62c086af1addca <08bc49e0541260bf294962cf889a32a2d2713ad6
  3. Affected versionversion=812443865c5fc255363d4a684a62c086af1addca <c479bde671cbe2f9e152834a8b0eb7c3c295bbaf
  4. Affected versionversion=812443865c5fc255363d4a684a62c086af1addca <e0c5693d3f9a5d4911735ab0e0eba4eecb1f1090

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=3.19; version=812443865c5fc255363d4a684a62c086af1addca <08bc49e0541260bf294962cf889a32a2d2713ad6; version=812443865c5fc255363d4a684a62c086af1addca <c479bde671cbe2f9e152834a8b0eb7c3c295bbaf; version=812443865c5fc255363d4a684a62c086af1addca <e0c5693d3f9a5d4911735ab0e0eba4eecb1f1090

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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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