NVD / CVE Program· CNA Linux

CVE-2024-44951: serial: sc16is7xx: fix TX fifo corruption

Noroxi assessment

Priority: Monitor (action score 31/100)

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: 0.20% (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 09cfe05e9907f3276887a20e267cc40e202f4fdd, 133f4c00b8b2bfcacead9b81e7e8edfceb4b06c4, 263682f5669ceeb70b14b4eda209fb34d67331ec.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 09cfe05e9907f3276887a20e267cc40e202f4fdd, 133f4c00b8b2bfcacead9b81e7e8edfceb4b06c4, 263682f5669ceeb70b14b4eda209fb34d67331ec 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: sc16is7xx: fix TX fifo corruption Sometimes, when a packet is received on channel A at almost the same time as a packet is about to be transmitted on channel B, we observe with a logic analyzer that the received packet on channel A is transmitted on channel B. In other words, the Tx buffer data on channel B is corrupted with data from channel A. The problem appeared since commit 4409df5866b7 ("serial: sc16is7xx: change EFR lock to operate on each channels"), which changed the EFR locking to operate on each channel instead of chip-wise. This commit has introduced a regression, because the EFR lock is used not only to protect the EFR registers access, but also, in a very obscure and undocumented way, to protect access to the data buffer, which is shared by the Tx and Rx handlers, but also by each channel of the IC. Fix this regression first by switching to kfifo_out_linear_ptr() in sc16is7xx_handle_tx() to eliminate the need for a shared Rx/Tx buffer. Secondly, replace the chip-wise Rx buffer with a separate Rx buffer for each channel.

HighCVSS 7.8 · v3.1—No exploit Fix available

BDU:2024-08524

Published: Sep 4, 2024
Updated: Oct 30, 2026
EPSS: 0.2% · 11th percentile
CWE: CWE-667

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 31 / 40 · 7.8 / 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.

CNA vs NVD score

NVD: 7.8
CNA · Linux: 7.8; agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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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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 kernel6.1.76 and later · before 6.2
linux linux kernel6.6.15 and later · before 6.7
linux linux kernel6.7.3 and later · before 6.8
linux linux kernel6.8 and later · before 6.10.5
linux linux kernel6.11

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
- dbe196ca489f3833e0f9eeb86ac346194f131c91, 6.8affected
- 4b068e55bf5ea7bab4d8a282c6a24b03e80c0b68 and later · before 263682f5669ceeb70b14b4eda209fb34d67331ecaffected · git
- 9879e1bec3c0f077427dd0d258c80c63ce9babdf and later · before 2a0ba376cdf729b5c66226c65c6c7cf9de744d52affected · git
- 4409df5866b7ff7686ba27e449ca97a92ee063c9 and later · before 09cfe05e9907f3276887a20e267cc40e202f4fddaffected · git
- 4409df5866b7ff7686ba27e449ca97a92ee063c9 and later · before 133f4c00b8b2bfcacead9b81e7e8edfceb4b06c4affected · git
- 6.1.76 and later · before 6.1.191affected · semver
- 6.6.15 and later · before 6.6.160affected · semver
- 6.7.3 and later · before 6.8affected · semver
- before 6.8not affected · semver
- 6.1.191 and later · up to and including 6.1.*not 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	from 0	—
Debian:13	linux	before 6.10.6-1	6.10.6-1

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
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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-2024-45008Sep 4, 2024 · Input: MT - limit max slots
22Monitor
← EarlierCVE-2024-44948Sep 4, 2024 · x86/mtrr: Check if fixed MTRRs exist before saving them
22Monitor
Later →CVE-2024-44960Sep 4, 2024 · usb: gadget: core: Check for unset descriptor
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	09cfe05e9907f3276887a20e267cc40e202f4fdd	Vendor (CNA)
Linux Linux	133f4c00b8b2bfcacead9b81e7e8edfceb4b06c4	Vendor (CNA)
Linux Linux	263682f5669ceeb70b14b4eda209fb34d67331ec	Vendor (CNA)
Linux Linux	2a0ba376cdf729b5c66226c65c6c7cf9de744d52	Vendor (CNA)
Linux Linux	6.1.191	Vendor (CNA)
Linux Linux	6.6.160	Vendor (CNA)
Linux Linux	6.8	Vendor (CNA)
debian:linux	6.10.6-1 · Debian:13	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).