CVE-2026-93168

CPU stall via zero-delay DMA polling

Published Sep 17, 2026 · Updated Sep 17, 2026

CPU stalls in the Xilinx DMA driver in Linux allow local users to interrupt processing when hardware fails to complete an operation. The xilinx_dma_poll_timeout calls use zero-delay polling, causing poll_timeout_us_atomic to underestimate elapsed time and busy-wait for minutes instead of approximately one second. Exposure requires the affected driver and a hardware condition that never completes; an attacker-controlled trigger is not documented, and the reported consequence is a prolonged CPU stall rather than a crash.

CVSS severity2.5
Low
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CPU stalls in the Xilinx DMA driver in Linux allow local users to interrupt processing when hardware fails to complete an operation. The xilinx_dma_poll_timeout calls use zero-delay polling, causing poll_timeout_us_atomic to underestimate elapsed time and busy-wait for minutes instead of approximately one second. Exposure requires the affected driver and a hardware condition that never completes; an attacker-controlled trigger is not documented, and the reported consequence is a prolonged CPU stall rather than a crash.

The record

CVE
CVE-2026-93168
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=4.6
  2. Affected versionversion=9495f2648287029fb5545c34a0fa318426ebe84c <8b5654d317277e6e505c23f8fa7e415237fefc7f
  3. Affected versionversion=9495f2648287029fb5545c34a0fa318426ebe84c <aa99c4d1d63bbc26a5fc4c667d89b2595743c19d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.6; version=9495f2648287029fb5545c34a0fa318426ebe84c <8b5654d317277e6e505c23f8fa7e415237fefc7f; version=9495f2648287029fb5545c34a0fa318426ebe84c <aa99c4d1d63bbc26a5fc4c667d89b2595743c19d

Published CVSS scores

2.5SUSECVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
2.5Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L

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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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