CVE-2026-43098

Local kernel crash via NULL receive buffer

Published May 6, 2026 · Updated May 6, 2026

NULL-pointer dereference in the s3fwrn5 NFC UART driver in Linux Kernel allows local users to crash the system during frame reception. s3fwrn82_uart_read() can consume and deliver a frame before allocating the next receive skb, then returns zero on allocation failure and leaves recv_skb NULL for skb_put_u8(). Reachability requires local access and the s3fwrn5 NFC UART receive path; the documented consequence is an availability-only kernel crash.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL-pointer dereference in the s3fwrn5 NFC UART driver in Linux Kernel allows local users to crash the system during frame reception. s3fwrn82_uart_read() can consume and deliver a frame before allocating the next receive skb, then returns zero on allocation failure and leaves recv_skb NULL for skb_put_u8(). Reachability requires local access and the s3fwrn5 NFC UART receive path; the documented consequence is an availability-only kernel crash.

The record

CVE
CVE-2026-43098
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. May 6, 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=3f52c2cb7e3ada37513dabb69a22cf917dba754f <09822d3d6f68a0cdc4626e0c507324a4927f55a9
  2. Affected versionversion=3f52c2cb7e3ada37513dabb69a22cf917dba754f <5c14a19d5b1645cce1cb1252833d70b23635b632
  3. Affected versionversion=3f52c2cb7e3ada37513dabb69a22cf917dba754f <6d931680a9851481c3243689488eafed08eeff71
  4. Affected versionversion=3f52c2cb7e3ada37513dabb69a22cf917dba754f <7c31f7a599cf00fad3c204092a91a924126c67e4
  5. Affected versionversion=3f52c2cb7e3ada37513dabb69a22cf917dba754f <d8c2aa3c4a1ec530a485e46a1c4f1a118bb00156
  6. Affected versionversion=5.11

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3f52c2cb7e3ada37513dabb69a22cf917dba754f <09822d3d6f68a0cdc4626e0c507324a4927f55a9; version=3f52c2cb7e3ada37513dabb69a22cf917dba754f <5c14a19d5b1645cce1cb1252833d70b23635b632; version=3f52c2cb7e3ada37513dabb69a22cf917dba754f <6d931680a9851481c3243689488eafed08eeff71; version=3f52c2cb7e3ada37513dabb69a22cf917dba754f <7c31f7a599cf00fad3c204092a91a924126c67e4; version=3f52c2cb7e3ada37513dabb69a22cf917dba754f <d8c2aa3c4a1ec530a485e46a1c4f1a118bb00156; version=5.11

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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