CVE-2025-21847

Local availability loss via unchecked cstream pointer

Published Mar 12, 2025 · Updated Jun 1, 2026

NULL pointer dereference in affected Linux kernel releases allows local users to interrupt the kernel through ASoC SOF stream handling. In sof_ipc_msg_data(), code assumes sps->cstream is non-NULL when sps->stream is NULL and dereferences it without the check used by sof_set_stream_data_offset(). Reachability requires local access to the SOF audio path; successful triggering affects availability without reported data disclosure or modification.

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

NULL pointer dereference in affected Linux kernel releases allows local users to interrupt the kernel through ASoC SOF stream handling. In sof_ipc_msg_data(), code assumes sps->cstream is non-NULL when sps->stream is NULL and dereferences it without the check used by sof_set_stream_data_offset(). Reachability requires local access to the SOF audio path; successful triggering affects availability without reported data disclosure or modification.

The record

CVE
CVE-2025-21847
Published
Mar 12, 2025
Updated
Jun 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 12, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 1, 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=090349a9feba3ceee3997d31d68ffe54e5b57acb <2b3878baf90918a361a3dfd3513025100b1b40b6
  2. Affected versionversion=090349a9feba3ceee3997d31d68ffe54e5b57acb <62ab1ae5511c59b5f0bf550136ff321331adca9f
  3. Affected versionversion=090349a9feba3ceee3997d31d68ffe54e5b57acb <6c18f5eb2043ebf4674c08a9690218dc818a11ab
  4. Affected versionversion=090349a9feba3ceee3997d31d68ffe54e5b57acb <d8d99c3b5c485f339864aeaa29f76269cc0ea975
  5. Affected versionversion=6.3
  6. Affected versionversion=e46f81541b1bf5db45a8c7a9cbc35ffc696877dc <dfe25c554daa12ee26eb3540bbded57733ed5d9c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=090349a9feba3ceee3997d31d68ffe54e5b57acb <2b3878baf90918a361a3dfd3513025100b1b40b6; version=090349a9feba3ceee3997d31d68ffe54e5b57acb <62ab1ae5511c59b5f0bf550136ff321331adca9f; version=090349a9feba3ceee3997d31d68ffe54e5b57acb <6c18f5eb2043ebf4674c08a9690218dc818a11ab; version=090349a9feba3ceee3997d31d68ffe54e5b57acb <d8d99c3b5c485f339864aeaa29f76269cc0ea975; version=6.3; version=e46f81541b1bf5db45a8c7a9cbc35ffc696877dc <dfe25c554daa12ee26eb3540bbded57733ed5d9c

Published CVSS scores

5.5NVDCVSS: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-476NULL Pointer Dereference
T1499.004Application or System Exploitation

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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