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NVD / CVE Program· CNA Linux

CVE-2025-38135: serial: Fix potential null-ptr-deref in mlb_usio_probe()

MediumCVSS 5.5 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.21% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 19fd9f5a69363d33079097d866eb6082d61bf31d, 548b0e81b9a0902a8bc8259430ed965663baadfc, 81159a6b064142b993f2f39828b77e199c77872a; azl3 kernel 6.6.92.2-2 on Azure Linux 3.0 6.6.96.1-1.

Low priority for now. Upgrade to Linux Linux 19fd9f5a69363d33079097d866eb6082d61bf31d, 548b0e81b9a0902a8bc8259430ed965663baadfc, 81159a6b064142b993f2f39828b77e199c77872a; azl3 kernel 6.6.92.2-2 on Azure Linux 3.0 6.6.96.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: serial: Fix potential null-ptr-deref in mlb_usio_probe() devm_ioremap() can return NULL on error. Currently, mlb_usio_probe() does not check for this case, which could result in a NULL pointer dereference. Add NULL check after devm_ioremap() to prevent this issue.

Published
Jul 3, 2025
Updated
Jun 17, 2026
EPSS
0.2% · 11th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Follow CVE-2025-38135

When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel
debiandebian linux

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.2affected
    • ba44dc04300441b47618f9933bf36e75a280e5fe and later · before a05ebe384c7ca75476453f3070c67d9cf1d1a89faffected · git
    • ba44dc04300441b47618f9933bf36e75a280e5fe and later · before 81159a6b064142b993f2f39828b77e199c77872aaffected · git
    • ba44dc04300441b47618f9933bf36e75a280e5fe and later · before 19fd9f5a69363d33079097d866eb6082d61bf31daffected · git
    • ba44dc04300441b47618f9933bf36e75a280e5fe and later · before 548b0e81b9a0902a8bc8259430ed965663baadfcaffected · git
    • ba44dc04300441b47618f9933bf36e75a280e5fe and later · before a6c7c365734cd0fa1c5aa225a6294fdf80cad2eaaffected · git
    • ba44dc04300441b47618f9933bf36e75a280e5fe and later · before c23d87b43f7dba5eb12820f6cf21a1cd4f63eb3daffected · git
    • ba44dc04300441b47618f9933bf36e75a280e5fe and later · before e1b144aebe6fb898d96ced8c990d7aa38fda4a7aaffected · git
    • ba44dc04300441b47618f9933bf36e75a280e5fe and later · before 86bcae88c9209e334b2f8c252f4cc66beb261886affected · git
    • before 5.2not affected · semver
Affected versions · NVD (8)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux11.0
  • linux linux kernel5.5 and later · before 5.10.239
  • linux linux kernel5.11 and later · before 5.15.186
  • linux linux kernel5.16 and later · before 6.1.142
  • linux linux kernel5.2 and later · before 5.4.295
  • linux linux kernel6.7 and later · before 6.12.34
  • linux linux kernel6.13 and later · before 6.15.3
  • linux linux kernel6.2 and later · before 6.6.94

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.147-16.1.147-1
Debian:13linuxbefore 6.12.35-16.12.35-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe…KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2025-38131Jul 3, 2025 · coresight: prevent deactivate active config while enabling the config
    31Monitor
  • ← EarlierCVE-2025-38133Jul 3, 2025 · iio: adc: ad4851: fix ad4858 chan pointer handling
    31Monitor
  • Later →CVE-2025-38136Jul 3, 2025 · usb: renesas_usbhs: Reorder clock handling and power management in probe
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux19fd9f5a69363d33079097d866eb6082d61bf31dVendor (CNA)
Linux Linux548b0e81b9a0902a8bc8259430ed965663baadfcVendor (CNA)
Linux Linux81159a6b064142b993f2f39828b77e199c77872aVendor (CNA)
Linux Linux86bcae88c9209e334b2f8c252f4cc66beb261886Vendor (CNA)
Linux Linuxa05ebe384c7ca75476453f3070c67d9cf1d1a89fVendor (CNA)
Linux Linuxa6c7c365734cd0fa1c5aa225a6294fdf80cad2eaVendor (CNA)
Linux Linuxc23d87b43f7dba5eb12820f6cf21a1cd4f63eb3dVendor (CNA)
Linux Linuxe1b144aebe6fb898d96ced8c990d7aa38fda4a7aVendor (CNA)
azl3 kernel 6.6.92.2-2 on Azure Linux 3.06.6.96.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.147-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-476 · NULL Pointer Dereference

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Show all references (9 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records