CVE-2026-22984Network attack vector

Out-of-bounds read via unchecked authentication payload length

Published Jan 23, 2026 · Updated Jan 23, 2026

Out-of-bounds read in Linux Kernel libceph allows remote attackers to read beyond a Ceph v2 authentication frame. process_auth_done() decodes payload_len but formerly passed that length and the remaining frame pointer to handle_auth_done() without confirming that the frame contains payload_len bytes. A malicious or compromised Ceph peer must supply a truncated authentication-completion message; published sources do not establish whether the read exposes kernel memory, crashes the client, or has another effect.

CVSS severity9.8
Critical
EPSS probability0.36%
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 libceph allows remote attackers to read beyond a Ceph v2 authentication frame. process_auth_done() decodes payload_len but formerly passed that length and the remaining frame pointer to handle_auth_done() without confirming that the frame contains payload_len bytes. A malicious or compromised Ceph peer must supply a truncated authentication-completion message; published sources do not establish whether the read exposes kernel memory, crashes the client, or has another effect.

The record

CVE
CVE-2026-22984
Published
Jan 23, 2026
Updated
Jan 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125
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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <194cfe2af4d2a1de599d39dad636b47c2f6c2c96
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2802ef3380fa8c4a08cda51ec1f085b1a712e9e2
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2d653bb63d598ae4b096dd678744bdcc34ee89e8
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <79fe3511db416d2f2edcfd93569807cb02736e5e
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <818156caffbf55cb4d368f9c3cac64e458fb49c9
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ef208ea331ef688729f64089b895ed1b49e842e3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <194cfe2af4d2a1de599d39dad636b47c2f6c2c96; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2802ef3380fa8c4a08cda51ec1f085b1a712e9e2; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2d653bb63d598ae4b096dd678744bdcc34ee89e8; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <79fe3511db416d2f2edcfd93569807cb02736e5e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <818156caffbf55cb4d368f9c3cac64e458fb49c9; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ef208ea331ef688729f64089b895ed1b49e842e3

Published CVSS scores

7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
9.8kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read

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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