CVE-2025-38632

Local crash via pinmux owner race

Published Aug 22, 2025 · Updated May 23, 2026

Race condition in affected Linux kernel pinmux releases allows local users to crash the system by repeatedly requesting the same pin. In drivers/pinctrl/pinmux.c, pin_free() clears desc->mux_owner after another thread has incremented desc->mux_usecount and assigned a new owner, leaving a nonzero use count paired with a null owner. Triggering the fault requires low-privileged local access and a high-complexity interleaving of concurrent pin requests; the documented consequence is a null-pointer crash.

CVSS severity4.7
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in affected Linux kernel pinmux releases allows local users to crash the system by repeatedly requesting the same pin. In drivers/pinctrl/pinmux.c, pin_free() clears desc->mux_owner after another thread has incremented desc->mux_usecount and assigned a new owner, leaving a nonzero use count paired with a null owner. Triggering the fault requires low-privileged local access and a high-complexity interleaving of concurrent pin requests; the documented consequence is a null-pointer crash.

The record

CVE
CVE-2025-38632
Published
Aug 22, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 22, 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

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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=2da32aed4a97ca1d70fb8b77926f72f30ce5fb4b <9b2a3e7189028aa7c4d53a84364f2ea9fb209787
  2. Affected versionversion=5a3e85c3c397c781393ea5fb2f45b1f60f8a4e6e <0b075c011032f88d1cfde3b45d6dcf08b44140eb
  3. Affected versionversion=5a3e85c3c397c781393ea5fb2f45b1f60f8a4e6e <22b585cbd67d14df3b91529d1b990661c300faa9
  4. Affected versionversion=5a3e85c3c397c781393ea5fb2f45b1f60f8a4e6e <b7bd6e3971eb7f0e34d2fdce1b18b08094e0c804
  5. Affected versionversion=6.12.5 <6.12.42
  6. Affected versionversion=6.13
  7. Affected versionversion=6.6.66 <6.6.102
  8. Affected versionversion=c11e2ec9a780f54982a187ee10ffd1b810715c85 <9ea3f6b9a67be3476e331ce51cac316c2614a564

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2da32aed4a97ca1d70fb8b77926f72f30ce5fb4b <9b2a3e7189028aa7c4d53a84364f2ea9fb209787; version=5a3e85c3c397c781393ea5fb2f45b1f60f8a4e6e <0b075c011032f88d1cfde3b45d6dcf08b44140eb; version=5a3e85c3c397c781393ea5fb2f45b1f60f8a4e6e <22b585cbd67d14df3b91529d1b990661c300faa9; version=5a3e85c3c397c781393ea5fb2f45b1f60f8a4e6e <b7bd6e3971eb7f0e34d2fdce1b18b08094e0c804; version=6.12.5 <6.12.42; version=6.13; version=6.6.66 <6.6.102; version=c11e2ec9a780f54982a187ee10ffd1b810715c85 <9ea3f6b9a67be3476e331ce51cac316c2614a564

Published CVSS scores

4.7UbuntuCVSS:3.1/AV:L/AC:H/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

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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