CVE-2025-21935

Local service interruption via unchecked RapidIO registration

Published Apr 1, 2025 · Updated May 11, 2026

Improper error handling in Linux kernel 4.6 and later allows local users to interrupt service through the RapidIO subsystem. rio_scan_alloc_net() ignores a rio_add_net() failure, retaining allocated memory and its initialized device reference instead of calling put_device(). Exploitation requires local low-privileged access and a RapidIO scan path in which device registration fails; confidentiality and integrity effects are not reported.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper error handling in Linux kernel 4.6 and later allows local users to interrupt service through the RapidIO subsystem. rio_scan_alloc_net() ignores a rio_add_net() failure, retaining allocated memory and its initialized device reference instead of calling put_device(). Exploitation requires local low-privileged access and a RapidIO scan path in which device registration fails; confidentiality and integrity effects are not reported.

The record

CVE
CVE-2025-21935
Published
Apr 1, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 1, 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=4.6
  2. Affected versionversion=e6b585ca6e81badeb3d42db3cc408174f2826034 <181d4daaefb3bceeb2f2635ba9f3781eeda9e550
  3. Affected versionversion=e6b585ca6e81badeb3d42db3cc408174f2826034 <4f3509cfcc02e9d757f2714bb7dbbeec35de6fa7
  4. Affected versionversion=e6b585ca6e81badeb3d42db3cc408174f2826034 <6d22953c4a183d0b7fdf34d68c5debd16da6edc5
  5. Affected versionversion=e6b585ca6e81badeb3d42db3cc408174f2826034 <a0d069ccc475abaaa79c6368ee27fc0b5912bea8
  6. Affected versionversion=e6b585ca6e81badeb3d42db3cc408174f2826034 <ad82be4298a89a9ae46f07128bdf3d8614bce745
  7. Affected versionversion=e6b585ca6e81badeb3d42db3cc408174f2826034 <c332f3e2df0fcae5a45fd55cc18902fb1e4825ca
  8. Affected versionversion=e6b585ca6e81badeb3d42db3cc408174f2826034 <e6411c3b9512dba09af7d014d474516828c89706
  9. Affected versionversion=e6b585ca6e81badeb3d42db3cc408174f2826034 <e842f9a1edf306bf36fe2a4d847a0b0d458770de

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.6; version=e6b585ca6e81badeb3d42db3cc408174f2826034 <181d4daaefb3bceeb2f2635ba9f3781eeda9e550; version=e6b585ca6e81badeb3d42db3cc408174f2826034 <4f3509cfcc02e9d757f2714bb7dbbeec35de6fa7; version=e6b585ca6e81badeb3d42db3cc408174f2826034 <6d22953c4a183d0b7fdf34d68c5debd16da6edc5; version=e6b585ca6e81badeb3d42db3cc408174f2826034 <a0d069ccc475abaaa79c6368ee27fc0b5912bea8; version=e6b585ca6e81badeb3d42db3cc408174f2826034 <ad82be4298a89a9ae46f07128bdf3d8614bce745; version=e6b585ca6e81badeb3d42db3cc408174f2826034 <c332f3e2df0fcae5a45fd55cc18902fb1e4825ca; version=e6b585ca6e81badeb3d42db3cc408174f2826034 <e6411c3b9512dba09af7d014d474516828c89706; version=e6b585ca6e81badeb3d42db3cc408174f2826034 <e842f9a1edf306bf36fe2a4d847a0b0d458770de

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

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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