CVE-2025-39923

Early-boot crash via missing device-tree error returns

Published Oct 1, 2025 · Updated May 23, 2026

Improper error handling in the Linux bam_dma driver allows local users to cause an early-boot crash on affected Qualcomm systems. The probe path continues after required device-tree properties are absent, then reads BAM registers without assurance that the hardware is powered. Reachability requires a Qualcomm BAM instance whose device tree omits a clock and required channel data; the bounded consequence is an early-boot crash.

CVSS severity5.5
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper error handling in the Linux bam_dma driver allows local users to cause an early-boot crash on affected Qualcomm systems. The probe path continues after required device-tree properties are absent, then reads BAM registers without assurance that the hardware is powered. Reachability requires a Qualcomm BAM instance whose device tree omits a clock and required channel data; the bounded consequence is an early-boot crash.

The record

CVE
CVE-2025-39923
Published
Oct 1, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 1, 2025CVE publishedPublication date reported by the CVE source.
  2. May 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.14.45 <4.15
  2. Affected versionversion=4.16.13 <4.17
  3. Affected versionversion=4.17
  4. Affected versionversion=48d163b1aa6e7f650c0b7a4f9c61c387a6def868 <0ff9df758af7022d749718fb6b8385cc5693acf3
  5. Affected versionversion=48d163b1aa6e7f650c0b7a4f9c61c387a6def868 <1d98ba204d8a6db0d986c7f1aefaa0dcd1c007a2
  6. Affected versionversion=48d163b1aa6e7f650c0b7a4f9c61c387a6def868 <1fc14731f0be4885e60702b9596d14d9a79cf053
  7. Affected versionversion=48d163b1aa6e7f650c0b7a4f9c61c387a6def868 <2e257a6125c63350f00dc42b9674f20fd3cf4a9f
  8. Affected versionversion=48d163b1aa6e7f650c0b7a4f9c61c387a6def868 <5068b5254812433e841a40886e695633148d362d
  9. Affected versionversion=48d163b1aa6e7f650c0b7a4f9c61c387a6def868 <555bd16351a35c79efb029a196975a5a27f7fbc4
  10. Affected versionversion=48d163b1aa6e7f650c0b7a4f9c61c387a6def868 <6ac1599d0e78036d9d08efc2f58c2d91f0a3ee4c
  11. Affected versionversion=48d163b1aa6e7f650c0b7a4f9c61c387a6def868 <ebf6c7c908e5999531c3517289598f187776124f
  12. Affected versionversion=4.9.104 <4.10
  13. Affected versionversion=5e0986f7caf17d7b1acd2092975360bf8e88a57d
  14. Affected versionversion=909474cd384cb206f33461fbd18089cf170533f8
  15. Affected versionversion=cecf8a69042b3a54cb843223756c10ee8a8665e3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.14.45 <4.15; version=4.16.13 <4.17; version=4.17; version=48d163b1aa6e7f650c0b7a4f9c61c387a6def868 <0ff9df758af7022d749718fb6b8385cc5693acf3; version=48d163b1aa6e7f650c0b7a4f9c61c387a6def868 <1d98ba204d8a6db0d986c7f1aefaa0dcd1c007a2; version=48d163b1aa6e7f650c0b7a4f9c61c387a6def868 <1fc14731f0be4885e60702b9596d14d9a79cf053; version=48d163b1aa6e7f650c0b7a4f9c61c387a6def868 <2e257a6125c63350f00dc42b9674f20fd3cf4a9f; version=48d163b1aa6e7f650c0b7a4f9c61c387a6def868 <5068b5254812433e841a40886e695633148d362d; version=48d163b1aa6e7f650c0b7a4f9c61c387a6def868 <555bd16351a35c79efb029a196975a5a27f7fbc4; version=48d163b1aa6e7f650c0b7a4f9c61c387a6def868 <6ac1599d0e78036d9d08efc2f58c2d91f0a3ee4c; version=48d163b1aa6e7f650c0b7a4f9c61c387a6def868 <ebf6c7c908e5999531c3517289598f187776124f; version=4.9.104 <4.10; version=5e0986f7caf17d7b1acd2092975360bf8e88a57d; version=909474cd384cb206f33461fbd18089cf170533f8; version=cecf8a69042b3a54cb843223756c10ee8a8665e3

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CanonicalCVSS: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.

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

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo