CVE-2025-38223

Kernel crash via unaligned encrypted-file read

Published Jul 4, 2025 · Updated May 11, 2026

Reachable assertion in the Linux CephFS client allows local users to crash the kernel by reading an encrypted file with an unaligned size. ceph_netfs_issue_read leaves subreq->io_iter.count unaligned, so the sparse-read total can exceed the message data length and trigger BUG_ON. Triggering the crash requires local access to a CephFS mount and an encrypted inode whose file size is not page-aligned.

CVSS severity5.5
Medium
EPSS probability0.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reachable assertion in the Linux CephFS client allows local users to crash the kernel by reading an encrypted file with an unaligned size. ceph_netfs_issue_read leaves subreq->io_iter.count unaligned, so the sparse-read total can exceed the message data length and trigger BUG_ON. Triggering the crash requires local access to a CephFS mount and an encrypted inode whose file size is not page-aligned.

The record

CVE
CVE-2025-38223
Published
Jul 4, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-617, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 4, 2025CVE publishedPublication date reported by the CVE source.
  2. May 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=6.12
  2. Affected versionversion=ee4cdf7ba857a894ad1650d6ab77669cbbfa329e <060909278cc0a91373a20726bd3d8ce085f480a9
  3. Affected versionversion=ee4cdf7ba857a894ad1650d6ab77669cbbfa329e <26725a76264b97d1ff104031b78da57f47741625
  4. Affected versionversion=ee4cdf7ba857a894ad1650d6ab77669cbbfa329e <75583606aeef357a524cf6afd07f4b653ae48964

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.12; version=ee4cdf7ba857a894ad1650d6ab77669cbbfa329e <060909278cc0a91373a20726bd3d8ce085f480a9; version=ee4cdf7ba857a894ad1650d6ab77669cbbfa329e <26725a76264b97d1ff104031b78da57f47741625; version=ee4cdf7ba857a894ad1650d6ab77669cbbfa329e <75583606aeef357a524cf6afd07f4b653ae48964

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499.004Application or System Exploitation

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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