CVE-2025-21914

Kernel panic via unreleased transaction identifier

Published Apr 1, 2025 · Updated Aug 5, 2026

Invalid memory access in the Linux kernel allows local users to trigger a kernel panic through delayed SlimBus interrupts. slim_do_transfer() returns after a timeout without freeing its transaction identifier, so qcom_slim_ngd_rx_msgq_cb() later uses an invalid identifier during message receipt. Reachability requires local low-privileged access and the Qualcomm SlimBus NGD path; the fatal interrupt exception stops the system.

CVSS severity7.8
High
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Invalid memory access in the Linux kernel allows local users to trigger a kernel panic through delayed SlimBus interrupts. slim_do_transfer() returns after a timeout without freeing its transaction identifier, so qcom_slim_ngd_rx_msgq_cb() later uses an invalid identifier during message receipt. Reachability requires local low-privileged access and the Qualcomm SlimBus NGD path; the fatal interrupt exception stops the system.

The record

CVE
CVE-2025-21914
Published
Apr 1, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 1, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=4.16
  2. Affected versionversion=afbdcc7c384b0d446da08b1e0901dc176b41b9e0 <09d34c4cbc38485c7514069f25348e439555b282
  3. Affected versionversion=afbdcc7c384b0d446da08b1e0901dc176b41b9e0 <0c541c8f6da23e0b92f0a6216d899659a7572074
  4. Affected versionversion=afbdcc7c384b0d446da08b1e0901dc176b41b9e0 <18ae4cee05c310c299ba75d7477dcf34be67aa16
  5. Affected versionversion=afbdcc7c384b0d446da08b1e0901dc176b41b9e0 <6abf3d8bb51cbaf886c3f08109a0462890b10db6
  6. Affected versionversion=afbdcc7c384b0d446da08b1e0901dc176b41b9e0 <a32e5198a9134772eb03f7b72a7849094c55bda9
  7. Affected versionversion=afbdcc7c384b0d446da08b1e0901dc176b41b9e0 <cec8c0ac173fe5321f03fdb1a09a9cb69bc9a9fe
  8. Affected versionversion=afbdcc7c384b0d446da08b1e0901dc176b41b9e0 <dcb0d43ba8eb9517e70b1a0e4b0ae0ab657a0e5a
  9. Affected versionversion=afbdcc7c384b0d446da08b1e0901dc176b41b9e0 <faac8e894014e8167471a8e4a5eb35a8fefbb82a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.16; version=afbdcc7c384b0d446da08b1e0901dc176b41b9e0 <09d34c4cbc38485c7514069f25348e439555b282; version=afbdcc7c384b0d446da08b1e0901dc176b41b9e0 <0c541c8f6da23e0b92f0a6216d899659a7572074; version=afbdcc7c384b0d446da08b1e0901dc176b41b9e0 <18ae4cee05c310c299ba75d7477dcf34be67aa16; version=afbdcc7c384b0d446da08b1e0901dc176b41b9e0 <6abf3d8bb51cbaf886c3f08109a0462890b10db6; version=afbdcc7c384b0d446da08b1e0901dc176b41b9e0 <a32e5198a9134772eb03f7b72a7849094c55bda9; version=afbdcc7c384b0d446da08b1e0901dc176b41b9e0 <cec8c0ac173fe5321f03fdb1a09a9cb69bc9a9fe; version=afbdcc7c384b0d446da08b1e0901dc176b41b9e0 <dcb0d43ba8eb9517e70b1a0e4b0ae0ab657a0e5a; version=afbdcc7c384b0d446da08b1e0901dc176b41b9e0 <faac8e894014e8167471a8e4a5eb35a8fefbb82a

Published CVSS scores

7.8CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-787Out-of-bounds Write
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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