CVE-2023-53094

Kernel crash via RX DMA shutdown race

Published May 2, 2025 · Updated Aug 5, 2026

Race condition in the fsl_lpuart serial driver in affected Linux kernels allows local users to crash the kernel during RX DMA shutdown. During shutdown, a DMA completion interrupt can restart the receive timer after the descriptor is freed, so the later timer callback dereferences a NULL dma_rx_desc pointer. The flaw requires local low-privileged access to an active Freescale LPUART device using RX DMA; successful triggering causes a system crash.

CVSS severity4.7
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the fsl_lpuart serial driver in affected Linux kernels allows local users to crash the kernel during RX DMA shutdown. During shutdown, a DMA completion interrupt can restart the receive timer after the descriptor is freed, so the later timer callback dereferences a NULL dma_rx_desc pointer. The flaw requires local low-privileged access to an active Freescale LPUART device using RX DMA; successful triggering causes a system crash.

The record

CVE
CVE-2023-53094
Published
May 2, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 2, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=0d5cb6e8b4b62d8efd1a470615894276341d6db9
  2. Affected versionversion=3.18.9 <3.19
  3. Affected versionversion=3.19.1 <3.20
  4. Affected versionversion=4.0
  5. Affected versionversion=4a8588a1cf867333187d9ff071e6fbdab587d194 <19a98d56dfedafb25652bdb9cd48a4e73ceba702
  6. Affected versionversion=4a8588a1cf867333187d9ff071e6fbdab587d194 <1be6f2b15f902c02e055ae0b419ca789200473c9
  7. Affected versionversion=4a8588a1cf867333187d9ff071e6fbdab587d194 <2a36b444cace9580380467fd1183bb5e85bcc80a
  8. Affected versionversion=4a8588a1cf867333187d9ff071e6fbdab587d194 <90530e7214c8a04dcdde57502d93fa96af288c38
  9. Affected versionversion=4a8588a1cf867333187d9ff071e6fbdab587d194 <954fc9931f0aabf272b5674cf468affdd88d3a36
  10. Affected versionversion=5716a781032693d0f812ed06528d98195e9df028

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0d5cb6e8b4b62d8efd1a470615894276341d6db9; version=3.18.9 <3.19; version=3.19.1 <3.20; version=4.0; version=4a8588a1cf867333187d9ff071e6fbdab587d194 <19a98d56dfedafb25652bdb9cd48a4e73ceba702; version=4a8588a1cf867333187d9ff071e6fbdab587d194 <1be6f2b15f902c02e055ae0b419ca789200473c9; version=4a8588a1cf867333187d9ff071e6fbdab587d194 <2a36b444cace9580380467fd1183bb5e85bcc80a; version=4a8588a1cf867333187d9ff071e6fbdab587d194 <90530e7214c8a04dcdde57502d93fa96af288c38; version=4a8588a1cf867333187d9ff071e6fbdab587d194 <954fc9931f0aabf272b5674cf468affdd88d3a36; version=5716a781032693d0f812ed06528d98195e9df028

Published CVSS scores

4.7NIST NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.7UbuntuCVSS:3.1/AV:L/AC:H/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

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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-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
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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