NVD / CVE Program· CNA Linux

CVE-2024-38634: serial: max3100: Lock port->lock when calling uart_handle_cts_change()

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: 0.18% (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 44b38924135d2093e2ec1812969464845dd66dc9, 77ab53371a2066fdf9b895246505f5ef5a4b5d47, 78dbda51bb4241b88a52d71620f06231a341f9ba.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 44b38924135d2093e2ec1812969464845dd66dc9, 77ab53371a2066fdf9b895246505f5ef5a4b5d47, 78dbda51bb4241b88a52d71620f06231a341f9ba 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: Lock port->lock when calling uart_handle_cts_change() uart_handle_cts_change() has to be called with port lock taken, Since we run it in a separate work, the lock may not be taken at the time of running. Make sure that it's taken by explicitly doing that. Without it we got a splat: WARNING: CPU: 0 PID: 10 at drivers/tty/serial/serial_core.c:3491 uart_handle_cts_change+0xa6/0xb0 ... Workqueue: max3100-0 max3100_work [max3100] RIP: 0010:uart_handle_cts_change+0xa6/0xb0 ... max3100_handlerx+0xc5/0x110 [max3100] max3100_work+0x12a/0x340 [max3100]

MediumCVSS 5.5 · v3.1—No exploit Fix available

Denial of service

BDU:2025-04185

Published: Jun 21, 2024
Updated: Jun 17, 2026
EPSS: 0.1% · 8th percentile
CWE: CWE-667

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 22 / 40 · 5.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.1%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

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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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Noroxi analysis

What does it mean in your environment?

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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.

Vendor	Product	CPE
linux	linux kernel	cpe:2.3:o:linux:linux_kernel

Affected versions

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

linux linux kernel2.6.31 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
linux linux kernel2.6.30

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 44b38924135d2093e2ec1812969464845dd66dc9affected · git
- 7831d56b0a3544cbb6f82f76c34ca95e24d5b676 and later · before ea9b35372b58ac2931bfc1d5bc25e839d1221e30affected · git
- 7831d56b0a3544cbb6f82f76c34ca95e24d5b676 and later · before cc121e3722a0a2c8f716ef991e5425b180a5fb94affected · git
- 7831d56b0a3544cbb6f82f76c34ca95e24d5b676 and later · before 78dbda51bb4241b88a52d71620f06231a341f9baaffected · git
- 7831d56b0a3544cbb6f82f76c34ca95e24d5b676 and later · before 8296bb9e5925b6634259c5d4daee88f0cc0884ecaffected · git
- 7831d56b0a3544cbb6f82f76c34ca95e24d5b676 and later · before 93df2fba6c7dfa9a2f08546ea9a5ca4728758458affected · git
- 7831d56b0a3544cbb6f82f76c34ca95e24d5b676 and later · before 865b30c8661924ee9145f442bf32cea549faa869affected · git
- 7831d56b0a3544cbb6f82f76c34ca95e24d5b676 and later · before 77ab53371a2066fdf9b895246505f5ef5a4b5d47affected · git
- before 2.6.30not affected · semver

Package-level exposure

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

Ecosystem	Package	Affected range	Fix
Debian:12	linux	before 6.1.94-1	6.1.94-1
Debian:13	linux	before 6.9.7-1	6.9.7-1

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-2024-38632Jun 21, 2024 · vfio/pci: fix potential memory leak in vfio_intx_enable()
22Monitor
← EarlierCVE-2024-38633Jun 21, 2024 · serial: max3100: Update uart_driver_registered on driver removal
22Monitor
Later →CVE-2024-38636Jun 21, 2024 · f2fs: multidev: fix to recognize valid zero block address
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 / package	Fixed version	Source
Linux Linux	44b38924135d2093e2ec1812969464845dd66dc9	Vendor (CNA)
Linux Linux	77ab53371a2066fdf9b895246505f5ef5a4b5d47	Vendor (CNA)
Linux Linux	78dbda51bb4241b88a52d71620f06231a341f9ba	Vendor (CNA)
Linux Linux	8296bb9e5925b6634259c5d4daee88f0cc0884ec	Vendor (CNA)
Linux Linux	865b30c8661924ee9145f442bf32cea549faa869	Vendor (CNA)
Linux Linux	93df2fba6c7dfa9a2f08546ea9a5ca4728758458	Vendor (CNA)
Linux Linux	cc121e3722a0a2c8f716ef991e5425b180a5fb94	Vendor (CNA)
Linux Linux	ea9b35372b58ac2931bfc1d5bc25e839d1221e30	Vendor (CNA)
debian:linux	6.1.94-1 · Debian:12	Package 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).