CVE-2026-22992Network attack vector

Service interruption via authentication-state error

Published Jan 23, 2026 · Updated Jan 23, 2026

NULL pointer dereference in Linux Kernel 5.11 through 6.19-rc4 allows remote attackers to interrupt service during libceph authentication. mon_handle_auth_done() fails to return an error from ceph_auth_handle_reply_done(), so msgr2 continues session setup after higher layers abort authentication. Secure mode and a failed authentication completion are required; the inconsistent state triggers setup_crypto() and dereferences a NULL pointer in prepare_auth_signature().

CVSS severity7.5
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Linux Kernel 5.11 through 6.19-rc4 allows remote attackers to interrupt service during libceph authentication. mon_handle_auth_done() fails to return an error from ceph_auth_handle_reply_done(), so msgr2 continues session setup after higher layers abort authentication. Secure mode and a failed authentication completion are required; the inconsistent state triggers setup_crypto() and dereferences a NULL pointer in prepare_auth_signature().

The record

CVE
CVE-2026-22992
Published
Jan 23, 2026
Updated
Jan 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 23, 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=5.11
  2. Affected versionversion=cd1a677cad994021b19665ed476aea63f5d54f31 <33908769248b38a5e77cf9292817bb28e641992d
  3. Affected versionversion=cd1a677cad994021b19665ed476aea63f5d54f31 <77229551f2cf72f3e35636db68e6a825b912cf16
  4. Affected versionversion=cd1a677cad994021b19665ed476aea63f5d54f31 <9e0101e57534ef0e7578dd09608a6106736b82e5
  5. Affected versionversion=cd1a677cad994021b19665ed476aea63f5d54f31 <d2c4a5f6996683f287f3851ef5412797042de7f1
  6. Affected versionversion=cd1a677cad994021b19665ed476aea63f5d54f31 <e097cd858196b1914309e7e3d79b4fa79383754d
  7. Affected versionversion=cd1a677cad994021b19665ed476aea63f5d54f31 <e84b48d31b5008932c0a0902982809fbaa1d3b70

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.11; version=cd1a677cad994021b19665ed476aea63f5d54f31 <33908769248b38a5e77cf9292817bb28e641992d; version=cd1a677cad994021b19665ed476aea63f5d54f31 <77229551f2cf72f3e35636db68e6a825b912cf16; version=cd1a677cad994021b19665ed476aea63f5d54f31 <9e0101e57534ef0e7578dd09608a6106736b82e5; version=cd1a677cad994021b19665ed476aea63f5d54f31 <d2c4a5f6996683f287f3851ef5412797042de7f1; version=cd1a677cad994021b19665ed476aea63f5d54f31 <e097cd858196b1914309e7e3d79b4fa79383754d; version=cd1a677cad994021b19665ed476aea63f5d54f31 <e84b48d31b5008932c0a0902982809fbaa1d3b70

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.5kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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

CWE-476NULL Pointer Dereference
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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