CVE-2023-52456

RS-485 interface denial via transmit deadlock

Published Feb 23, 2024 · Updated May 11, 2026

Denial of service in the Linux kernel's i.MX serial driver allows local users to disable an RS-485 interface by closing its TTY. During an incomplete transmission, imx_uart_shutdown disables the Transmission Complete interrupt before imx_uart_stop_tx defers cleanup to that disabled interrupt, trapping the state machine in SEND. The trigger requires an i.MX UART configured for RS-485 and a TTY closure during transmission; the resulting impact is limited to that interface.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux kernel's i.MX serial driver allows local users to disable an RS-485 interface by closing its TTY. During an incomplete transmission, imx_uart_shutdown disables the Transmission Complete interrupt before imx_uart_stop_tx defers cleanup to that disabled interrupt, trapping the state machine in SEND. The trigger requires an i.MX UART configured for RS-485 and a TTY closure during transmission; the resulting impact is limited to that interface.

The record

CVE
CVE-2023-52456
Published
Feb 23, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 23, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=5.9
  2. Affected versionversion=cb1a609236096c278ecbfb7be678a693a70283f1 <63ee7be01a3f7d28b1ea8b8d7944f12bb7b0ed06
  3. Affected versionversion=cb1a609236096c278ecbfb7be678a693a70283f1 <6e04a9d30509fb53ba6df5d655ed61d607a7cfda
  4. Affected versionversion=cb1a609236096c278ecbfb7be678a693a70283f1 <763cd68746317b5d746dc2649a3295c1efb41181
  5. Affected versionversion=cb1a609236096c278ecbfb7be678a693a70283f1 <78d60dae9a0c9f09aa3d6477c94047df2fe6f7b0
  6. Affected versionversion=cb1a609236096c278ecbfb7be678a693a70283f1 <9a662d06c22ddfa371958c2071dc350436be802b
  7. Affected versionversion=cb1a609236096c278ecbfb7be678a693a70283f1 <ff168d4fdb0e1ba35fb413a749b3d6cce918ec19

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.9; version=cb1a609236096c278ecbfb7be678a693a70283f1 <63ee7be01a3f7d28b1ea8b8d7944f12bb7b0ed06; version=cb1a609236096c278ecbfb7be678a693a70283f1 <6e04a9d30509fb53ba6df5d655ed61d607a7cfda; version=cb1a609236096c278ecbfb7be678a693a70283f1 <763cd68746317b5d746dc2649a3295c1efb41181; version=cb1a609236096c278ecbfb7be678a693a70283f1 <78d60dae9a0c9f09aa3d6477c94047df2fe6f7b0; version=cb1a609236096c278ecbfb7be678a693a70283f1 <9a662d06c22ddfa371958c2071dc350436be802b; version=cb1a609236096c278ecbfb7be678a693a70283f1 <ff168d4fdb0e1ba35fb413a749b3d6cce918ec19

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

CWE-667Improper Locking
T1499Endpoint Denial of Service

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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