CVE-2026-89542Network attack vector

Remote system crash via malformed Kerberos tokens

Published Sep 11, 2026 · Updated Sep 11, 2026

Memory corruption in Linux kernel SUNRPC allows remote attackers to crash the system via a malformed Kerberos GSS token. gss_krb5_unwrap_v2 reads header fields before checking token length, while rotation and cleanup arithmetic can underflow, divide by zero, or drive an oversized memory move. Reachability requires SUNRPC Kerberos GSS token processing; successful triggering can corrupt kernel memory or interrupt the system.

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

Memory corruption in Linux kernel SUNRPC allows remote attackers to crash the system via a malformed Kerberos GSS token. gss_krb5_unwrap_v2 reads header fields before checking token length, while rotation and cleanup arithmetic can underflow, divide by zero, or drive an oversized memory move. Reachability requires SUNRPC Kerberos GSS token processing; successful triggering can corrupt kernel memory or interrupt the system.

The record

CVE
CVE-2026-89542
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

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=2.6.35
  2. Affected versionversion=de9c17eb4a912c9028f7b470eb80815144883b26 <6959297aaa9572783d620a226d73c3fb94494888
  3. Affected versionversion=de9c17eb4a912c9028f7b470eb80815144883b26 <806584a4b67a7233870c33e5b8f872e76dd02988
  4. Affected versionversion=de9c17eb4a912c9028f7b470eb80815144883b26 <a7894e10572d53eb10109b8d07459cc8d3435811
  5. Affected versionversion=de9c17eb4a912c9028f7b470eb80815144883b26 <dddcb0f4b7e27fac16a78ea9a1c8ec2e8a241087

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.35; version=de9c17eb4a912c9028f7b470eb80815144883b26 <6959297aaa9572783d620a226d73c3fb94494888; version=de9c17eb4a912c9028f7b470eb80815144883b26 <806584a4b67a7233870c33e5b8f872e76dd02988; version=de9c17eb4a912c9028f7b470eb80815144883b26 <a7894e10572d53eb10109b8d07459cc8d3435811; version=de9c17eb4a912c9028f7b470eb80815144883b26 <dddcb0f4b7e27fac16a78ea9a1c8ec2e8a241087

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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