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NVD / CVE Program· CNA Linux

CVE-2024-38633: serial: max3100: Update uart_driver_registered on driver removal

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: 0.24% (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 21a61a7fbcfdd3493cede43ebc7c4dfae2147a8b, 361a92c9038e8c8c3996f8eeaa14522a8ad90752, 712a1fcb38dc7cac6da63ee79a88708fbf9c45ec.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 21a61a7fbcfdd3493cede43ebc7c4dfae2147a8b, 361a92c9038e8c8c3996f8eeaa14522a8ad90752, 712a1fcb38dc7cac6da63ee79a88708fbf9c45ec 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: max3100: Update uart_driver_registered on driver removal The removal of the last MAX3100 device triggers the removal of the driver. However, code doesn't update the respective global variable and after insmod — rmmod — insmod cycle the kernel oopses: max3100 spi-PRP0001:01: max3100_probe: adding port 0 BUG: kernel NULL pointer dereference, address: 0000000000000408 ... RIP: 0010:serial_core_register_port+0xa0/0x840 ... max3100_probe+0x1b6/0x280 [max3100] spi_probe+0x8d/0xb0 Update the actual state so next time UART driver will be registered again. Hugo also noticed, that the error path in the probe also affected by having the variable set, and not cleared. Instead of clearing it move the assignment after the successfull uart_register_driver() call.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Jun 21, 2024
Updated
Jun 17, 2026
EPSS
0.2% · 15th 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%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

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

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2024-38633

When you'll hear from us

  • when it enters CISA KEV
  • 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

Affected versions

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

  • linux linux kernel2.6.30 and later · before 4.19.316
  • linux linux kernel4.20 and later · before 5.4.278
  • linux linux kernel5.5 and later · before 5.10.219
  • linux linux kernel5.11 and later · before 5.15.161
  • linux linux kernel5.16 and later · before 6.1.93
  • linux linux kernel6.2 and later · before 6.6.33
  • linux linux kernel6.7 and later · before 6.9.4

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

    • 2.6.30affected
    • 7831d56b0a3544cbb6f82f76c34ca95e24d5b676 and later · before 21a61a7fbcfdd3493cede43ebc7c4dfae2147a8baffected · git
    • 7831d56b0a3544cbb6f82f76c34ca95e24d5b676 and later · before 9db4222ed8cd3e50b81c8b910ae74c26427a4003affected · git
    • 7831d56b0a3544cbb6f82f76c34ca95e24d5b676 and later · before e8e2a4339decad7e59425b594a98613402652d72affected · git
    • 7831d56b0a3544cbb6f82f76c34ca95e24d5b676 and later · before 361a92c9038e8c8c3996f8eeaa14522a8ad90752affected · git
    • 7831d56b0a3544cbb6f82f76c34ca95e24d5b676 and later · before b6eb7aff23e05f362e8c9b560f6ac5e727b70e00affected · git
    • 7831d56b0a3544cbb6f82f76c34ca95e24d5b676 and later · before e8a10089eddba40d4b2080c9d3fc2d2b2488f762affected · git
    • 7831d56b0a3544cbb6f82f76c34ca95e24d5b676 and later · before fa84ca78b048dfb00df0ef446f5c35e0a98ca6a0affected · git
    • 7831d56b0a3544cbb6f82f76c34ca95e24d5b676 and later · before 712a1fcb38dc7cac6da63ee79a88708fbf9c45ecaffected · git
    • before 2.6.30not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.94-16.1.94-1
Debian:13linuxbefore 6.9.7-16.9.7-1

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-2024-38631Jun 21, 2024 · iio: adc: PAC1934: fix accessing out of bounds array index
    31Monitor
  • ← EarlierCVE-2024-38632Jun 21, 2024 · vfio/pci: fix potential memory leak in vfio_intx_enable()
    22Monitor
  • Later →CVE-2024-38634Jun 21, 2024 · serial: max3100: Lock port->lock when calling uart_handle_cts_change()
    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 Linux21a61a7fbcfdd3493cede43ebc7c4dfae2147a8bVendor (CNA)
Linux Linux361a92c9038e8c8c3996f8eeaa14522a8ad90752Vendor (CNA)
Linux Linux712a1fcb38dc7cac6da63ee79a88708fbf9c45ecVendor (CNA)
Linux Linux9db4222ed8cd3e50b81c8b910ae74c26427a4003Vendor (CNA)
Linux Linuxb6eb7aff23e05f362e8c9b560f6ac5e727b70e00Vendor (CNA)
Linux Linuxe8a10089eddba40d4b2080c9d3fc2d2b2488f762Vendor (CNA)
Linux Linuxe8e2a4339decad7e59425b594a98613402652d72Vendor (CNA)
Linux Linuxfa84ca78b048dfb00df0ef446f5c35e0a98ca6a0Vendor (CNA)
debian:linux6.1.94-1 · 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.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

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.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (8 more)

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

All records