CVE-2026-80791Network attack vector

Pre-authentication kernel data disclosure via uninitialized response

Published Sep 4, 2026 · Updated Sep 4, 2026

Information disclosure in the Linux kernel allows remote attackers to read uninitialized slab data during NVMe authentication. nvmet_execute_auth_receive() uses a host-supplied allocation length for a kmalloc() buffer, writes only a fixed-size DH-HMAC-CHAP message, then copies the full allocation to the initiator. Reachability requires an exposed NVMe target with in-band DH-HMAC-CHAP authentication, and each response can disclose nearly one page of residual kernel heap data.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in the Linux kernel allows remote attackers to read uninitialized slab data during NVMe authentication. nvmet_execute_auth_receive() uses a host-supplied allocation length for a kmalloc() buffer, writes only a fixed-size DH-HMAC-CHAP message, then copies the full allocation to the initiator. Reachability requires an exposed NVMe target with in-band DH-HMAC-CHAP authentication, and each response can disclose nearly one page of residual kernel heap data.

The record

CVE
CVE-2026-80791
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=6.0
  2. Affected versionversion=db1312dd95488b5e6ff362ff66fcf953a46b1821 <1d6837d98bf966a041af65de5f78de7409ff83bc
  3. Affected versionversion=db1312dd95488b5e6ff362ff66fcf953a46b1821 <2dcc9226203da7275a9c29d20007da278d73d5e9
  4. Affected versionversion=db1312dd95488b5e6ff362ff66fcf953a46b1821 <3ddcfb013322aa37eaa7a0d344b73079c38dfa21
  5. Affected versionversion=db1312dd95488b5e6ff362ff66fcf953a46b1821 <447b668faa14710f611e714031e3739ac3ec3a4f
  6. Affected versionversion=db1312dd95488b5e6ff362ff66fcf953a46b1821 <8f6363c8d54dde95982f0ab45e77cf57ec0efd62
  7. Affected versionversion=db1312dd95488b5e6ff362ff66fcf953a46b1821 <b26189d28442183a8b5edb754f4a6918f77ca84e
  8. Affected versionversion=db1312dd95488b5e6ff362ff66fcf953a46b1821 <dfcf013f77709ebdb282767edc2795a37cab5b57

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.0; version=db1312dd95488b5e6ff362ff66fcf953a46b1821 <1d6837d98bf966a041af65de5f78de7409ff83bc; version=db1312dd95488b5e6ff362ff66fcf953a46b1821 <2dcc9226203da7275a9c29d20007da278d73d5e9; version=db1312dd95488b5e6ff362ff66fcf953a46b1821 <3ddcfb013322aa37eaa7a0d344b73079c38dfa21; version=db1312dd95488b5e6ff362ff66fcf953a46b1821 <447b668faa14710f611e714031e3739ac3ec3a4f; version=db1312dd95488b5e6ff362ff66fcf953a46b1821 <8f6363c8d54dde95982f0ab45e77cf57ec0efd62; version=db1312dd95488b5e6ff362ff66fcf953a46b1821 <b26189d28442183a8b5edb754f4a6918f77ca84e; version=db1312dd95488b5e6ff362ff66fcf953a46b1821 <dfcf013f77709ebdb282767edc2795a37cab5b57

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
Privilegesunauthenticated
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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