CVE-2025-38072

Kernel crash via zero CXL LSA size

Published Jun 18, 2025 · Updated May 11, 2026

Division by zero in Linux allows local users to crash the kernel when a faulty CXL memory device reports a zero LSA size. In nd_label_data_init(), the reported size makes max_xfer zero, and DIV_ROUND_UP uses that value as its divisor. Reachability requires libnvdimm initialization of the faulty device; the resulting kernel oops interrupts the host.

CVSS severity5.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Division by zero in Linux allows local users to crash the kernel when a faulty CXL memory device reports a zero LSA size. In nd_label_data_init(), the reported size makes max_xfer zero, and DIV_ROUND_UP uses that value as its divisor. Reachability requires libnvdimm initialization of the faulty device; the resulting kernel oops interrupts the host.

The record

CVE
CVE-2025-38072
Published
Jun 18, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-908, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 18, 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=4.20
  2. Affected versionversion=7d47aad4570e5e6e9a8162bb417ca9b74132f27c <1d1e1efad1cf049e888bf175a5c6be85d792620c
  3. Affected versionversion=7d47aad4570e5e6e9a8162bb417ca9b74132f27c <2bd4a938d2eda96ab7288b8fa5aae84a1de8c4ca
  4. Affected versionversion=7d47aad4570e5e6e9a8162bb417ca9b74132f27c <396c46d3f59a18ebcc500640e749f16e197d472b
  5. Affected versionversion=7d47aad4570e5e6e9a8162bb417ca9b74132f27c <db1aef51b8e66a77f76b1250b914589c31a0a0ed
  6. Affected versionversion=7d47aad4570e5e6e9a8162bb417ca9b74132f27c <e14347f647ca6d76fe1509b6703e340f2d5e2716
  7. Affected versionversion=7d47aad4570e5e6e9a8162bb417ca9b74132f27c <ea3d95e05e97ea20fd6513f647393add16fce3b2
  8. Affected versionversion=7d47aad4570e5e6e9a8162bb417ca9b74132f27c <ef1d3455bbc1922f94a91ed58d3d7db440652959
  9. Affected versionversion=7d47aad4570e5e6e9a8162bb417ca9b74132f27c <f49c337037df029440a8390380dd35d2cf5924d3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.20; version=7d47aad4570e5e6e9a8162bb417ca9b74132f27c <1d1e1efad1cf049e888bf175a5c6be85d792620c; version=7d47aad4570e5e6e9a8162bb417ca9b74132f27c <2bd4a938d2eda96ab7288b8fa5aae84a1de8c4ca; version=7d47aad4570e5e6e9a8162bb417ca9b74132f27c <396c46d3f59a18ebcc500640e749f16e197d472b; version=7d47aad4570e5e6e9a8162bb417ca9b74132f27c <db1aef51b8e66a77f76b1250b914589c31a0a0ed; version=7d47aad4570e5e6e9a8162bb417ca9b74132f27c <e14347f647ca6d76fe1509b6703e340f2d5e2716; version=7d47aad4570e5e6e9a8162bb417ca9b74132f27c <ea3d95e05e97ea20fd6513f647393add16fce3b2; version=7d47aad4570e5e6e9a8162bb417ca9b74132f27c <ef1d3455bbc1922f94a91ed58d3d7db440652959; version=7d47aad4570e5e6e9a8162bb417ca9b74132f27c <f49c337037df029440a8390380dd35d2cf5924d3

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.1Oracle LinuxCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-908Use of Uninitialized Resource
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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