CVE-2025-21747

Spurious kernel warning via premature ASTDP timeout

Published Feb 27, 2025 · Updated May 11, 2026

Timeout handling in the AST DisplayPort driver in Linux kernel 6.13 allows local users to trigger a spurious kernel warning. The ast_dp_set_enable path waits only 200 milliseconds for a transmitter that can require up to one second, then warns even though signal enablement succeeds. Reachability requires an AST DisplayPort transmitter and a modeset that enables its video signal; the Linux CNA describes the effect as cosmetic, without lost output or service interruption.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Timeout handling in the AST DisplayPort driver in Linux kernel 6.13 allows local users to trigger a spurious kernel warning. The ast_dp_set_enable path waits only 200 milliseconds for a transmitter that can require up to one second, then warns even though signal enablement succeeds. Reachability requires an AST DisplayPort transmitter and a modeset that enables its video signal; the Linux CNA describes the effect as cosmetic, without lost output or service interruption.

The record

CVE
CVE-2025-21747
Published
Feb 27, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 27, 2025CVE 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=4e29cc7c5c673299cfbaf4982fc8b6a72c9f706f <589839379031cce220c9cab9f27cb5477195067e
  2. Affected versionversion=4e29cc7c5c673299cfbaf4982fc8b6a72c9f706f <fd39c41bcd82d5ebaaebadb944eab5598c668a90
  3. Affected versionversion=6.13

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4e29cc7c5c673299cfbaf4982fc8b6a72c9f706f <589839379031cce220c9cab9f27cb5477195067e; version=4e29cc7c5c673299cfbaf4982fc8b6a72c9f706f <fd39c41bcd82d5ebaaebadb944eab5598c668a90; version=6.13

Published CVSS scores

5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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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