VulnerabilityPublished 17 Sep 2026Updated 21 Oct 2026

CVE-2026-93083: Linux kernel · firmware: arm_scmi: Unwind TX receiver mailbox setup failure

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in d4cf99c7ea95accde58df34bc8636bbebb3066c2 : 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 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in d4cf99c7ea95accde58df34bc8636bbebb3066c2, babb017cf5e4600c94c23ea87175a0380235a3ee, 9958f55eace8b43713c9fc54dcf90e7cdefee413 +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 ≥ 9f68ff79ec2cb303f360a35eef5dd8f1f0f817e1, < d4cf99c7ea95accde58df34bc8636bbebb3066c2	Fixed in d4cf99c7ea95accde58df34bc8636bbebb3066c2
LinuxLinux	Affected ≥ 9f68ff79ec2cb303f360a35eef5dd8f1f0f817e1, < babb017cf5e4600c94c23ea87175a0380235a3ee	Fixed in babb017cf5e4600c94c23ea87175a0380235a3ee
LinuxLinux	Affected ≥ 9f68ff79ec2cb303f360a35eef5dd8f1f0f817e1, < 9958f55eace8b43713c9fc54dcf90e7cdefee413	Fixed in 9958f55eace8b43713c9fc54dcf90e7cdefee413
LinuxLinux	Affected ≥ 9f68ff79ec2cb303f360a35eef5dd8f1f0f817e1, < 717b8e972a667fc1bebe63cbcf0d58e692cbb491	Fixed in 717b8e972a667fc1bebe63cbcf0d58e692cbb491
LinuxLinux	Affected ≥ 9f68ff79ec2cb303f360a35eef5dd8f1f0f817e1, < 6f7c06744d53dc8e047725d411d7f915d9ec35ae	Fixed in 6f7c06744d53dc8e047725d411d7f915d9ec35ae
LinuxLinux	Affected =6.4	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: firmware: arm_scmi: Unwind TX receiver mailbox setup failure mailbox_chan_setup() can request an additional unidirectional TX receiver channel after successfully acquiring the primary channel. If that second request fails, the function returns immediately and leaves the primary channel allocated. Unwind the primary mailbox channel before returning the error so probe deferral or other setup failures do not leave the channel busy for later probe attempts.

References

Community reviews

Loading reviews…