VulnerabilityPublished 17 Sep 2026Updated 19 Oct 2026

CVE-2026-93086: Linux kernel · firmware: arm_scmi: Avoid IDR updates while cleaning channels

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in c38b1e19485aaa820e52cfe162525a8af67563da : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:47 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.2% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in c38b1e19485aaa820e52cfe162525a8af67563da, bab26acebe55e8ad3ab545abda72faa7ca28c477, aed24a3c63920539e9de7fbfe7929a2e7c888cd2 +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, < c38b1e19485aaa820e52cfe162525a8af67563da	Fixed in c38b1e19485aaa820e52cfe162525a8af67563da
LinuxLinux	Affected ≥ 05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1, < bab26acebe55e8ad3ab545abda72faa7ca28c477	Fixed in bab26acebe55e8ad3ab545abda72faa7ca28c477
LinuxLinux	Affected ≥ 05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1, < aed24a3c63920539e9de7fbfe7929a2e7c888cd2	Fixed in aed24a3c63920539e9de7fbfe7929a2e7c888cd2
LinuxLinux	Affected ≥ 05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1, < 431c6b872ba7fedcc5a3afb0ec3517db4d95d088	Fixed in 431c6b872ba7fedcc5a3afb0ec3517db4d95d088
LinuxLinux	Affected ≥ 05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1, < 54e5a4f7d83db4552d963d0785be32d9df680dcd	Fixed in 54e5a4f7d83db4552d963d0785be32d9df680dcd
LinuxLinux	Affected =6.3	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: firmware: arm_scmi: Avoid IDR updates while cleaning channels scmi_cleanup_channels() walks the TX/RX channel IDRs with idr_for_each() to free transport resources and destroy the dedicated transport devices before calling idr_destroy(). The destroy callback removed each entry from the same IDR being walked. That is not needed for this cleanup path, and it is unsafe because idr_for_each() has not advanced its radix-tree iterator while the callback is running. Removing the current entry from the callback can invalidate the iterator state. The callback also cannot be protected by rcu_read_lock(), because scmi_device_destroy() may sleep. Leave IDR teardown to the following idr_destroy() call and keep the callback limited to device destruction.

References

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