VulnerabilityPublished 17 Sep 2026Updated 19 Oct 2026

CVE-2026-93085: Linux kernel · firmware: arm_scmi: Reject out of range DT protocol IDs

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in e66756313d1b4eadd13f39a0aee9fc8773d4d375 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 17:16 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in e66756313d1b4eadd13f39a0aee9fc8773d4d375, 59407ccb52130f2c81f4b3cbe4f14114afceb54f, 5142fd31bd8c9aff9bad4f6e0cc20e9574f2cee1 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 17 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1, < e66756313d1b4eadd13f39a0aee9fc8773d4d375	Fixed in e66756313d1b4eadd13f39a0aee9fc8773d4d375
LinuxLinux	Affected ≥ 05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1, < 59407ccb52130f2c81f4b3cbe4f14114afceb54f	Fixed in 59407ccb52130f2c81f4b3cbe4f14114afceb54f
LinuxLinux	Affected ≥ 05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1, < 5142fd31bd8c9aff9bad4f6e0cc20e9574f2cee1	Fixed in 5142fd31bd8c9aff9bad4f6e0cc20e9574f2cee1
LinuxLinux	Affected ≥ 05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1, < 8eb2ab209570526728b35e39c4aecdb5099fbaf7	Fixed in 8eb2ab209570526728b35e39c4aecdb5099fbaf7
LinuxLinux	Affected ≥ 05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1, < 0b6e59eb885f985a5ea7beed385adfa9412b324d	Fixed in 0b6e59eb885f985a5ea7beed385adfa9412b324d
LinuxLinux	Affected =6.3	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to reject out-of-range DT protocol IDs in the arm_scmi firmware component. Users should update to the fixed kernel versions containing the patches identified by the provided commit hashes to remediate this issue.

Description

A vulnerability in the Linux kernel's arm_scmi firmware component allowed out-of-range device tree (DT) protocol IDs to be processed incorrectly. The issue involved protocol IDs exceeding the allowed range being logged but still processed, leading to potential truncation or misinterpretation of protocol IDs. This could cause improper channel setup or protocol device creation. The flaw has been fixed by skipping DT protocol nodes with invalid protocol ID values during setup.

Impact

Improper handling of out-of-range SCMI protocol IDs could lead to incorrect protocol identification and channel setup within the Linux kernel, potentially causing unexpected behavior in firmware communication. There is no indication of active exploitation or direct security compromise from this vulnerability in the provided data.

Summary

The Linux kernel's arm_scmi firmware component previously accepted SCMI protocol IDs in message headers that exceeded the defined MSG_PROTOCOL_ID_MASK range. While out-of-range IDs were logged as errors, the kernel continued processing them, allowing malformed 32-bit DT reg values to be truncated or misinterpreted as different protocol IDs. This could result in distinct IDR keys aliasing the same SCMI protocol identity during channel setup. The fix involves ignoring DT protocol nodes whose reg values do not fit within the valid SCMI protocol ID field before channel setup or protocol device creation.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Oct 2026, 14:48 UTC

Technical details

References

Community reviews

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