CVE-2026-89541Network attack vector

Out-of-bounds reads via wrapped RPCSEC_GSS opaque length

Published Sep 11, 2026 · Updated Sep 11, 2026

Out-of-bounds read in Linux kernel SUNRPC clients allows remote attackers controlling a krb5p NFS server to trigger invalid memory access. The gss_unwrap_resp_priv function adds two u32 values without overflow protection and accepts tokens shorter than the RFC 4121 header, forwarding invalid bounds to gss_krb5_unwrap_v2. Successful exploitation requires a client to process a crafted RPCSEC_GSS privacy reply from an attacker-controlled krb5p NFS server.

CVSS severityUnavailable
Unscored
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Linux kernel SUNRPC clients allows remote attackers controlling a krb5p NFS server to trigger invalid memory access. The gss_unwrap_resp_priv function adds two u32 values without overflow protection and accepts tokens shorter than the RFC 4121 header, forwarding invalid bounds to gss_krb5_unwrap_v2. Successful exploitation requires a client to process a crafted RPCSEC_GSS privacy reply from an attacker-controlled krb5p NFS server.

The record

CVE
CVE-2026-89541
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
network
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=2.6.15
  2. Affected versionversion=2d2da60c63b67174add32f06e8d54c3a0c5cd9cf <87831b92112c81db251d46756d65daa4f91af6a2
  3. Affected versionversion=2d2da60c63b67174add32f06e8d54c3a0c5cd9cf <89a15a50f84d32d4b99db86f957427fcbe20a99a
  4. Affected versionversion=2d2da60c63b67174add32f06e8d54c3a0c5cd9cf <d395c30d570ca6168f0297b191709927d1258273
  5. Affected versionversion=2d2da60c63b67174add32f06e8d54c3a0c5cd9cf <ebcbd2523a8524c3d24e111cdbed8e271d910269

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.15; version=2d2da60c63b67174add32f06e8d54c3a0c5cd9cf <87831b92112c81db251d46756d65daa4f91af6a2; version=2d2da60c63b67174add32f06e8d54c3a0c5cd9cf <89a15a50f84d32d4b99db86f957427fcbe20a99a; version=2d2da60c63b67174add32f06e8d54c3a0c5cd9cf <d395c30d570ca6168f0297b191709927d1258273; version=2d2da60c63b67174add32f06e8d54c3a0c5cd9cf <ebcbd2523a8524c3d24e111cdbed8e271d910269

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)
Vectornetwork
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.

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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